All Tools
374 tools in total · All free · ready to use
MD5 Online Decrypt
This MD5 online decryption tool quickly recovers MD5 hashes through reverse lookup. Enter a 32-character ciphertext and get the original text with one click — ideal for cryptography research and information security assessment.
Encoding & Encryption 308.7k uses
Run Python Online
Run Python code online with support for installing a rich set of third-party libraries. It includes built-in chart rendering, virtual file management, preview and download, and works instantly in a browser sandbox.
Development 288.5k uses
IP Address Lookup
A professional online IP address lookup tool offering fast, accurate global IP geolocation. It precisely shows the country, province, city and network provider associated with an IP.
Webmaster Tools 232.7k uses
Random Phone Number Generator
A free online random phone number generator supporting many countries and regions. Generate virtual numbers in realistic formats in bulk and export the results to Excel or TXT.
Office & Study 192.5k uses
Online Calculator
A free online calculator that works instantly in your browser with no installation. Basic mode supports add, subtract, multiply, divide, percentages and sign toggling, while scientific mode adds trigonometry, logarithms, roots, powers, factorials, absolute value and degree/radian switching, with one-click result copying.
Everyday Life 125k uses
QQ Avatar Lookup
Fetch QQ avatars, QQ Mail avatars and QQ Zone avatars online. Simply enter a QQ number to instantly display the matching avatar — no login required and available on any device.
Everyday Life 115k uses
Online Emoji Collection
The latest and most complete online Emoji collection, featuring thousands of common and up-to-date emojis. Browse by category or search by keyword, then copy and paste with one click.
Everyday Life 108.5k uses
QQ Number Value Evaluator
An intelligent QQ number valuation tool that analyzes number length, digit patterns, rarity and special meanings to provide market value analysis and price references.
Fun & Leisure 97k uses
Domain Whois Lookup
A free online Whois lookup tool supporting a large number of top-level domains. Quickly get the domain registrar, registration date, expiry date, DNS servers and registrant information.
Webmaster Tools 86.7k uses
Audio Size Compressor
A free, professional online audio compressor supporting many input formats with both lossy compression and lossless conversion modes. Customize bitrate, sample rate and channels, all processed locally in your browser to protect your privacy.
Audio Processing 84.8k uses
BMI Calculator
A free online BMI calculator: enter your height and weight to instantly get your body mass index. See whether you are underweight, normal, overweight or obese, plus tailored diet and exercise tips to help you manage your weight scientifically.
Everyday Life 83k uses
Network Port Reference
A free online network port reference listing the services and protocols of common and registered ports. Search by port number or keyword, perfect for development, operations and security troubleshooting.
Webmaster Tools 66.1k uses
Random Password Generator
An online random password generator that lets you customize length and character sets to create strong random passwords. Generate in bulk and copy with one click to strengthen your account security.
Encoding & Encryption 61k uses
QR Code Generator
A free online QR code generator: enter text or a URL to create a QR code image. Adjust the size and error correction level, then download and save it.
Image Processing 58k uses
Batch Whois Lookup
A free online batch Whois lookup tool that accepts multiple domains at once and lists each domain's registration status, registrar, registration and expiry dates line by line. It automatically distinguishes registered, unregistered, registry-reserved and unsupported domains, and results can be copied or exported to CSV.
Webmaster Tools 54k uses
Timestamp Converter
An online Unix timestamp converter that shows the current timestamp in real time and converts between timestamps and dates in both directions. Switch between seconds and milliseconds precision and pick your time zone — a must-have for development and debugging.
Webmaster Tools 52k uses
Online Unit Converter
A free online unit converter covering length, weight, area, volume, temperature, data size, time, speed and more. Get instant results as you type, swap units, and copy with one click on any phone or computer.
Everyday Life 46k uses
Income Tax Calculator
A free online income tax calculator that computes personal income tax on wages and salaries using the cumulative withholding method. It supports social insurance and housing fund deductions as well as special additional deductions, and shows your after-tax salary.
Everyday Life 44k uses
Base64 Encode & Decode
An online Base64 encoding and decoding tool that handles Chinese text and file content. Encode or restore with one click — a common utility for development and debugging.
Encoding & Encryption 41k uses
Special Symbols Collection
A comprehensive and efficient online special symbols collection featuring emojis, math symbols, arrows, currency signs, punctuation, numbered lists and thousands more characters. Search by keyword and copy any symbol with a single click to boost your work and social efficiency.
Everyday Life 38k uses
JSON Formatter & Validator
A free online JSON formatter and validator: beautify, minify and syntax-check JSON with one click. Choose 2/4-space or tab indentation and get error position hints — a handy tool for API debugging and data cleanup.
Development 36k uses
Age & Birthday Calculator
A free online age calculator: enter your birth date to get your exact age in years, days lived and months, plus your zodiac sign, Chinese zodiac and the days until your next birthday.
Everyday Life 31k uses
URL Encode / Decode
An online URL encoder and decoder that supports both whole-URL and single-parameter modes. Escape or restore Chinese text and special characters with one click — essential for development and API integration.
Development 29k uses
Random Number Generator
An online random number generator that produces random integers within a range and count you specify. It supports unique values and sorting, perfect for lucky draws, roll calls and test data.
Fun & Leisure 27k uses
Hash Generator
A free online hash generator supporting MD5, SHA-1, SHA-256, SHA-384 and SHA-512. Enter text to compute a digest instantly, switch between upper and lower case, and copy with one click — a common utility for development and data verification.
Encoding & Encryption 26k uses
Online Word Count
An online word count tool that shows characters, words, Chinese characters, lines, paragraphs and sentences in real time, and estimates reading time. A must-have before writing copy or checking a thesis.
Office & Study 25k uses
Regex Tester
An online regular expression tester with real-time match highlighting, group capture, and flags such as case-insensitive and global. See matches and their count instantly — essential for developing and debugging regex.
Development 24k uses
Color Converter
An online color converter that converts between HEX, RGB and HSL in real time, with a built-in color picker and common palette. What you see is what you get — essential for front-end theming and design color picking.
Image Processing 22k uses
UUID Generator
A free online UUID generator that creates version 4 (random) universally unique identifiers in bulk. Options include uppercase, removing hyphens and up to 100 IDs at once — a must-have for development and testing.
Development 21k uses
Cron Expression Parser
An online Cron expression parser supporting both the standard 5-field and the 6-field (with seconds) formats. It validates the expression and computes the next several run times — a must-have for operations and scheduled-task debugging.
Development 20k uses
HTML Entity Encoder
An online HTML entity encoder and decoder: escape special characters such as angle brackets and ampersands into HTML entities, or restore them with one click. It handles Chinese text and bulk input — a common tool for front-end and web development.
Encoding & Encryption 19k uses
URL Parser
An online URL parser that breaks a web address into protocol, host, port, path, query parameters and anchor, and lists every parameter clearly in a table — essential for development and API debugging.
Development 18k uses
Text Diff Tool
A free online text diff tool that compares two texts line by line and highlights additions and deletions. It supports ignoring case and leading/trailing whitespace, ideal for version proofreading and copy revision.
Office & Study 18k uses
JWT Decoder
An online JWT decoder: paste a JSON Web Token to decode its Header, Payload and Signature, and automatically detect issue and expiry times. Everything is parsed locally without uploading, keeping it safe and fast.
Development 17k uses
UTM Link Builder
An online UTM link builder: fill in the site URL and parameters such as utm_source, utm_medium and utm_campaign to generate a trackable campaign link — a must-have for marketing and traffic analysis.
Webmaster Tools 16k uses
Image to Base64
An online image to Base64 tool: drag and drop or select an image to convert it to a Data URL instantly in your browser. Copy it or download as text — your image is never uploaded, keeping it safe and fast.
Image Processing 16k uses
Image Compressor
A free online image compression tool supporting JPG, PNG and WebP with adjustable quality. Everything is processed locally in your browser without uploading, quickly reducing image size while keeping it as clear as possible.
Image Processing 15k uses
Number Base Converter
An online number base converter that converts between any bases from 2 to 36. Enter a value to instantly get its binary, octal, decimal and hexadecimal forms — essential for development and learning computer fundamentals.
Development 15k uses
Online Countdown Timer
An online countdown timer and stopwatch: count down to a custom target time or duration with days, hours, minutes and seconds shown in real time, or use it as a stopwatch — a great helper for study, work and events.
Everyday Life 14k uses
Text Case Converter
An online text case converter that switches between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case and kebab-case with one click. A handy tool for writing and programming.
Office & Study 14k uses
Lorem Ipsum Generator
A free online Lorem Ipsum placeholder text generator. Customize the number of paragraphs and sentences per paragraph, generate dummy text for layout mockups in one click, and copy or clear it easily — ideal for design and front-end work.
Office & Study 13k uses
Morse Code Converter
An online Morse code converter that translates between text and Morse code in both directions, covering letters, digits and common punctuation. Encode or decode with one click and copy the result — great for fun learning and signal enthusiasts.
Fun & Leisure 12.1k uses
CSS Gradient Generator
An online CSS gradient generator: visually adjust the gradient type, angle and colors, preview the result in real time, and copy the CSS code with one click — a great helper for front-end theming and background design.
Image Processing 11k uses
Loan Calculator
A free online mortgage calculator supporting both equal installment and equal principal repayment methods. Enter the loan amount, annual interest rate and term to get the monthly payment, total interest and total repayment — a must-have for home buyers.
Everyday Life 10k uses
Image Diff
Compare two images pixel by pixel in your browser and highlight every difference in red. Quickly verify edits or spot changes between versions. Processed locally, never uploaded.
Image Processing 59 uses
Image Sprite Generator
Combine several images into one sprite sheet in your browser and generate matching CSS background-position rules. Processed locally, never uploaded.
Image Processing 56 uses
Image Frame & Rounded Corners
An online tool for adding a frame and rounded corners to images. Set the border color and width, corner radius, shadow strength, background margin and background color. Everything is processed locally in your browser, ideal for social posts and portfolio showcases.
Image Processing 54 uses
Image Crop & Rotate
An online image crop, rotate and flip tool. Open an image locally to drag a crop area, rotate it 90 degrees, or flip it horizontally and vertically, with live preview and download. All processing happens in your browser without uploading.
Image Processing 52 uses
Image Watermark
An online image watermark tool that adds text or image watermarks with adjustable position, size, opacity and rotation. Everything is processed locally in your browser without uploading — handy for protecting image copyright.
Image Processing 52 uses
Rotate & Flip Image
Rotate images 90/180 degrees or flip them horizontally and vertically in your browser. Drop one or many images, transform them all at once and download. Processed locally, never uploaded.
Image Processing 49 uses
Image Stitcher (Long Image)
An online image stitching tool that combines multiple images horizontally or vertically into one long image, with adjustable spacing and alignment. All processing happens locally in your browser without uploading.
Image Processing 49 uses
Image Filters
An online image filter tool for adjusting brightness, contrast, saturation, hue, blur and grayscale in real time, with presets such as vintage, black-and-white and warm. Everything is processed locally in your browser, so nothing is uploaded, and you can export the finished image in one click.
Image Processing 49 uses
Image to PDF
An online tool to convert images into a PDF. Combine multiple images into one PDF in order, with configurable page size and orientation. The PDF is generated locally in your browser without uploading — handy for archiving and submitting documents.
Image Processing 48 uses
Avatar Generator
An online avatar generator: just enter a letter, a character or a nickname to create initial- and geometric-style avatars. Customize the color scheme, shape (square, rounded or circle) and output size, then shuffle the colors or download the result as a PNG. Handy for profile pictures and placeholder graphics.
Image Processing 48 uses
Guess the Number
A quick online number guessing game. The system picks a random number in a range, and you use the too high / too low hints to narrow it down while the number of guesses and the time are counted. Replay as soon as you hit the answer.
Fun & Leisure 48 uses
Badge Generator
Generate Shields-style SVG badges online. Customize the label, value, colors and style to create badges for showing version and build status in your README.
Development 47 uses
Image Mosaic & Blur
Hide private parts of an image by painting a mosaic or blur over any area. Adjust the brush size and strength, then download the result. Processed locally, never uploaded.
Image Processing 47 uses
Batch Resize Images
Resize many images at once in your browser by setting a target width or a percentage. Upload multiple files and download them all as a ZIP. Processed locally, never uploaded.
Image Processing 47 uses
Image Format Converter
An online image format converter that supports converting between JPG, PNG and WebP. Adjust the quality and dimensions; everything is processed locally in your browser without uploading, so you quickly get the image format you need.
Development 47 uses
Image Color Palette
An online image color palette tool: open an image to extract its main colors and generate a palette, sample the pixel color anywhere and copy HEX/RGB values — a great helper for design and color matching.
Image Processing 47 uses
Image Grid Splitter
An online image grid splitter that cuts one image into equal blocks by rows and columns and downloads them block by block, with custom row and column counts. Great for nine-grid social posts and collage material.
Image Processing 47 uses
Meme Maker
An online meme maker: open an image, add top and bottom text, customize font size and color, and generate a meme image in one click — great for chat battles and content creation.
Image Processing 47 uses
ID Photo Background Changer
An online tool to change the background color and crop ID photos. Upload a photo to replace the background with red, blue or white and crop it to standard sizes such as 1-inch or 2-inch, then export. All processing happens locally in your browser without uploading.
Image Processing 47 uses
Image Mosaic & Blur
An online tool to pixelate or blur parts of an image. Apply mosaic or Gaussian blur to selected areas with adjustable strength and range. All processing happens locally in your browser without uploading — handy for covering private information.
Image Processing 47 uses
Image Compare
An online image comparison tool. Upload two images and use a draggable divider to view them side by side and spot the differences. Adjust the split by dragging or with the keyboard, which makes it handy for design reviews and before/after checks.
Image Processing 47 uses
HTML to Markdown
An online HTML to Markdown converter: paste your HTML source and get clean Markdown text instantly. It handles headings, lists, links, images, tables and code blocks, making content migration easy.
Office & Study 47 uses
Online Audio Recorder
Record audio from your microphone right in the browser. Start, pause and stop, view timed recordings, play them back and download as WebM or OGG.
Audio Processing 47 uses
PDF to Image
Convert PDF pages to high-quality images in your browser. Render each page to PNG or JPEG, set the scale and page range, then download them all.
Office & Study 47 uses
Markdown Preview
An online Markdown preview and conversion tool that renders headings, lists, tables, code blocks, links and images in real time, and lets you copy the generated HTML source. Handy for writing documents and blog formatting.
Development 46 uses
Base64 to Image
An online Base64 to image converter: paste Base64 data or a Data URI to restore and preview the image and download it. Supports PNG, JPG, GIF, WebP and more, processed locally in your browser without uploads.
Encoding & Encryption 46 uses
Certificate Generator
Online certificate generator: customize the title, recipient and date to create a printable award certificate, all processed locally in your browser without uploading.
Office & Study 46 uses
Tic-Tac-Toe
Play tic-tac-toe online against the computer. The AI uses an optimal minimax strategy, and you can choose who moves first or restart anytime. A classic pick for casual fun and quick relaxation.
Fun & Leisure 46 uses
Compress Image to a Target Size
An online tool that compresses an image to a target file size in KB. After you set the goal, it automatically adjusts quality and dimensions to approach that size while keeping the best possible quality. Everything runs locally in your browser, which makes it handy for upload limits and application documents.
Image Processing 46 uses
Placeholder Image Generator
An online placeholder image generator: set the width, height, background color, text and font size to create a placeholder image. Preview it on the canvas, then download it as a PNG or copy the SVG source. Commonly used in front-end development and layout work.
Development 46 uses
PDF Image Extractor
Recover the embedded images hidden inside a PDF right in your browser. Browse thumbnails across all pages and download each image as PNG, or grab them all at once — no upload required.
Office & Study 46 uses
Image to ICO Converter
An online tool to convert PNG/JPG images into .ico files for website favicons, with support for multiple sizes. The file is generated locally in your browser and never uploaded.
Image Processing 45 uses
Video Rotator & Flipper
Rotate any video 90° clockwise or counter-clockwise, flip it horizontally or vertically, or turn it 180° — all in your browser. Export the result instantly, fully local with no upload.
Video Processing 43 uses
PDF Poster Tile Print
Online PDF poster tiler: enlarge a single page into a large poster split across multiple sheets of paper and add crop marks for printing and mounting. Processed locally.
Office & Study 43 uses
PDF N-up Layout
Online PDF N-up layout tool: arrange a multi-page PDF as 2/4/6/9 pages per sheet to save paper when printing. Processed locally, no upload.
Office & Study 43 uses
Audio Trimmer
Trim audio files online with a visual waveform. Drag the sliders to set start and end times, preview the selection, and export the trimmed clip as WAV or MP3.
Audio Processing 43 uses
Audio Volume Booster
Adjust or boost the volume of any audio file in your browser. Set the gain from 0% to 400%, optionally normalize peaks, then export as WAV or MP3.
Audio Processing 43 uses
SERP Preview
Preview in real time how your page appears in Google and Baidu search results. Enter title, URL and description to check the snippet rendering and get title/description length hints.
Webmaster Tools 43 uses
Video Mute (Remove Audio)
Remove the audio track from any video in your browser and download a silent WebM file. No upload, no software install — completely private.
Video Processing 43 uses
Hanzi Unicode Lookup
Look up Chinese characters online: show each character's Unicode code point (e.g. U+4E2D), HTML decimal and hex entities, and UTF-8 byte sequence. Runs locally in your browser.
Chinese Text 42 uses
Table to SQL
Online table-to-SQL converter: paste CSV, TSV or table data to generate INSERT statements, or convert it to JSON or Markdown tables. Custom table and column names are supported — a handy tool for data migration.
Development 42 uses
Meta Tags Generator
Generate meta tags online. Fill in title, description, keywords, canonical, Open Graph and Twitter card fields, then copy standard meta tags ready for the page head. Runs locally, nothing uploaded.
Webmaster Tools 42 uses
PDF Encryption Info Detector
Online PDF encryption info detector: check whether a PDF is encrypted, its encryption algorithm and permission restrictions, and view copyable details. Parsed locally, no upload.
Office & Study 42 uses
Snake Game
Play the classic Snake game online. Use the arrow keys to guide the snake, eat food to grow longer, and score points. The game ends if you hit the wall or your own body, and it keeps track of your score and high score in real time.
Fun & Leisure 42 uses
Minesweeper
Play Minesweeper online with beginner, intermediate, and expert difficulties. Left-click to reveal a tile, right-click to place a flag, and empty areas expand automatically. A timer and mine counter track your progress, and your best time is saved for each level.
Fun & Leisure 42 uses
Video Crop
Crop any video in your browser: drag a rectangle over the preview to keep the part you want and cut away black bars or clutter. Processed locally, never uploaded.
Video Processing 41 uses
Base64 to File
Decode a Base64 string back into a file and download it in your browser. The file type is detected automatically from the data, with a sensible filename. Processed locally, never uploaded.
Development 41 uses
Unicode Escape Converter
An online Unicode escape tool that converts between Chinese and other characters and \uXXXX escape sequences in both directions, with options to escape only non-ASCII or all characters. Commonly used for handling JSON, code and multilingual text.
Development 41 uses
Text Similarity Calculator
Compare two texts online using Levenshtein edit distance and token-based cosine similarity, showing a similarity percentage. Useful for duplication checks. Runs locally.
Chinese Text 41 uses
Random Data Generator
An online random test data generator that batch-creates fake names, phone numbers, emails, addresses, ID cards, JSON and more from a template, with configurable row count and fields — handy for development testing and demo data.
Development 41 uses
Markdown Table Generator
Online Markdown table generator: add or remove rows and columns visually, fill in the cells, and get standard Markdown table text in real time. Set per-column alignment and copy the result with one click — handy for writing docs and README files.
Office & Study 41 uses
Markdown to HTML
An online Markdown to HTML converter: paste Markdown to generate the matching HTML code with live preview. It supports headings, lists, quotes, tables and code blocks — handy for blogs and documentation.
Office & Study 41 uses
Electricity Cost Calculator
An online electricity cost calculator: enter each appliance's power, daily hours and quantity, plus the price per kWh and number of days, to estimate energy use and cost. It totals multiple appliances for the whole period. Great for saving energy and household budgeting.
Everyday Life 41 uses
Signature Pad
A handwritten signature pad online: sign on the canvas with the mouse or your finger. Adjust the stroke width and ink color, with undo, clear and strokes that vary naturally with writing speed, then export a PNG with a transparent or white background. Great for e-signatures and signature images.
Fun & Leisure 41 uses
Audio Speed Changer
Speed up or slow down any audio file in your browser. Adjust playback from 0.5x to 2x, preview it instantly, and export the result as WAV or MP3.
Audio Processing 41 uses
PDF Merge
Merge multiple PDF files into one document right in your browser. Reorder the files and pages, then combine and download—nothing gets uploaded.
Office & Study 41 uses
Video Trimmer
Trim any video right in your browser by choosing start and end points on a slider. Preview the selection and export the clip as a WebM file — no upload, no watermark, fully private.
Video Processing 41 uses
Video to GIF
Turn any video into an animated GIF right in your browser. Pick the clip range, frame rate, size and quality, and download your GIF instantly — no upload and no watermark.
Video Processing 41 uses
YAML / TOML / JSON Converter
Convert seamlessly between YAML, TOML and JSON in your browser. Paste your data, pick the source and target formats, and get clean output instantly — with automatic conversion, clear error messages and one-click copy or download.
Development 41 uses
Function Calling Schema Generator
Generate a valid OpenAI function-calling tool definition in seconds. Add the function name and description, define parameters (name, type, required, description, enum) visually, and get a tools JSON with a proper parameters JSON Schema ready to copy.
AI 41 uses
Chinese Simplified / Traditional Converter
A free online Chinese converter that switches between Simplified and Traditional Chinese in both directions using phrase-based rules for common words — useful for copywriting and cross-region communication.
Office & Study 40 uses
Password Strength Checker
An online password strength checker that evaluates your password in real time based on length, character variety and common weak passwords, and provides a crack-time estimate and improvement tips to help you set a safer password.
Encoding & Encryption 40 uses
RSA Key Generator
An online RSA key pair generator that uses the browser's Web Crypto API to create 1024/2048/4096-bit keys locally, and can export the public and private keys in PEM or JWK format — nothing is ever uploaded.
Encoding & Encryption 40 uses
Git Command Builder
Build common Git commands visually in the browser. Choose commit, branch, merge, revert and more, then assemble the command to save memorizing syntax. Processed locally.
Development 40 uses
Barcode Generator
An online barcode generator that supports common one-dimensional codes such as Code39. Enter your content to create a barcode image, adjust the size and whether to show text, and download it as a picture — ideal for products, warehousing and numbering management.
Development 40 uses
Chinese Pinyin Sorter
Sort a Chinese list by Pinyin alphabetical order online. Supports leading-letter sorting and common polyphonic characters, ideal for name lists. Runs locally in your browser.
Chinese Text 40 uses
Chinese / English Punctuation Converter
Convert punctuation between Chinese full-width and English half-width online. Covers commas, periods, quotes, brackets, ellipsis and dashes, tidying mixed CN/EN text. Runs locally.
Chinese Text 40 uses
ARIA Attribute Generator
Generate ARIA attributes online. Pick a component role such as button, dialog or tab, toggle states like aria-expanded or aria-checked, and copy the resulting aria-* snippet. Runs locally, nothing uploaded.
Webmaster Tools 40 uses
Receipt Generator
Online receipt generator: enter amounts, line items and payment details to create a printable receipt, all processed locally in your browser without uploading.
Office & Study 40 uses
Truth or Dare
An online Truth or Dare tool that randomly draws a truth question or a dare challenge, with truth-only, dare-only and mixed modes. Add your own prompts—saved right in your browser—and take turns drawing again and again. A go-to party game for breaking the ice, warming things up and having fun with friends.
Fun & Leisure 40 uses
GraphQL Formatter
An online GraphQL query formatter: paste a GraphQL statement and it is automatically indented and beautified, with one-line minification and syntax highlighting preview. Handy for API debugging and code cleanup.
Development 40 uses
Markdown to PDF
Convert Markdown into a clean, well-formatted PDF in your browser. Type or paste your text, preview the result live, then export or print it as a PDF.
Office & Study 40 uses
PDF to Text
Pull the text out of any PDF in seconds, right in your browser. Each page is shown separately with one-click copy, plus copy-all and a .txt download — nothing is ever uploaded.
Office & Study 40 uses
AI Prompt Builder
Build well-structured prompts with system, user and assistant roles in your browser. Add or remove role messages, choose ready-made presets for writing, coding, translation and support, fill in {{variable}} placeholders, then copy the prompt or export a JSON messages array.
AI 40 uses
Commit Message Generator
Generate standardized commit messages online. Pick a type and scope following the Conventional Commits spec, fill in a description, and produce clean, consistent commits for better teamwork.
Development 39 uses
Video Speed Changer
Speed up or slow down any video from 0.25x to 4x right in your browser. Create fast-motion or slow-motion clips and export them locally — no upload, no sign-up and no watermark.
Video Processing 39 uses
Color Harmony Generator
Generate harmonious color schemes from a base color in your browser: complementary, analogous, triadic and more. Output the color values with one-click copy. Processed locally.
Image Processing 39 uses
Random Picker & Grouping
An online random picker and grouping tool that can randomly pick one person from a list, shuffle the order, or evenly divide people into several groups. A must-have for classroom roll calls, activity lucky draws and team grouping.
Office & Study 39 uses
Text Sort & Dedupe
An online text deduplication and sorting tool supporting line-by-line deduplication, ascending or descending sort, and removal of empty lines and leading/trailing spaces, with real-time counts of lines and characters. Commonly used for list cleanup and data cleaning.
Office & Study 39 uses
JSONPath Tester
An online JSONPath query tester: enter JSON and a JSONPath expression to extract matching results in real time. Supports dot/bracket notation, wildcards, recursive descent and filter expressions — ideal for API debugging and data extraction.
Development 39 uses
HTTP Status Codes
A comprehensive online reference of HTTP status codes, covering the meanings, causes and suggested actions for common 1xx to 5xx codes, with search by number or keyword. Essential for development and troubleshooting.
Webmaster Tools 39 uses
Full-width / Half-width Converter
Convert between full-width and half-width characters online. Handles letters, digits and punctuation mixed in Chinese text, plus the ideographic space. Runs locally, no upload.
Chinese Text 39 uses
One-Click Text Cleaner
An online text cleaner that removes extra spaces, blank lines, line breaks and tabs in one click. You can also strip HTML tags, quotes and invisible characters, and normalize line endings and case — perfect for tidying copy and cleaning data.
Office & Study 39 uses
Box Shadow Generator
Visually craft CSS box shadows: adjust offset, blur, spread, color and opacity, toggle inset, stack multiple layers, preview live, and copy the box-shadow CSS.
Development 39 uses
Video Compressor
Shrink large videos in your browser by choosing a target resolution and quality. It shows the original and compressed sizes plus the space saved — no upload required.
Video Processing 39 uses
Reverse Video
Play any video backwards to create eye-catching reversed clips. The whole process runs locally in your browser and exports a silent WebM file — nothing is uploaded to a server.
Video Processing 38 uses
HTTP Header Checker
A free online HTTP response header checker: enter a URL to view the status code, response headers, server information and redirect chain, helping you troubleshoot website access, caching and security policy issues.
Webmaster Tools 38 uses
JSON to CSV Converter
A free online tool to convert between JSON and CSV. Turn flat or nested JSON arrays into CSV tables, or import CSV back to JSON, with a customizable delimiter — a must-have for data processing and import/export.
Development 38 uses
NDJSON Converter
Convert between NDJSON (JSON Lines) and a standard JSON array online. Blank lines are tolerated, making it handy for logs and data streams. Runs entirely in your browser, with no upload.
Development 38 uses
CSV to Markdown
Convert CSV data into a clean, aligned Markdown table online. Ideal for pasting tabular data into README files, docs and notes. Runs entirely in your browser, so nothing is ever uploaded.
Development 38 uses
DBML to SQL
Convert DBML database modeling syntax into CREATE TABLE DDL with primary keys, foreign keys and indexes. Everything runs locally in your browser, never uploaded.
Development 38 uses
Base58 Encode & Decode
An online Base58 encoder and decoder commonly used to encode and restore Bitcoin and other blockchain addresses. It removes easily confused characters, converts Chinese and any text both ways, and runs entirely in your browser without uploading.
Encoding & Encryption 38 uses
CRC32 Checksum Calculator
An online CRC32 checksum calculator: enter text or select a file to compute the CRC32 value, with decimal and hexadecimal output. Commonly used for data verification and file comparison.
Encoding & Encryption 38 uses
Sitemap.xml Generator
An online sitemap.xml generator: enter your site address and page list to build a spec-compliant sitemap. Set change frequency and priority, then download or copy in one click — essential for SEO indexing.
Webmaster Tools 38 uses
PDF Metadata Cleaner
View and erase PDF metadata such as author, title and software, along with hidden information, in your browser. Runs locally, never uploaded.
Office & Study 38 uses
JWT Generator
An online JWT generator and signer supporting the HS256/HS384/HS512 algorithms. Paste your payload JSON and enter a secret to produce a standard JSON Web Token, or verify a signature — a handy tool for API authentication debugging.
Encoding & Encryption 38 uses
SPF/DMARC Record Generator
An online SPF and DMARC record generator: visually configure sending sources, mechanisms and policies, generate standard TXT records with one click, and get DKIM tips — essential for email deliverability and anti-spam setup.
Webmaster Tools 38 uses
IP Range Calculator
An online IP range calculator and merger: enter start and end IPs or a CIDR to get the network range, mask, usable host count and address list. It also merges and deduplicates multiple networks—handy for network planning and operations.
Webmaster Tools 38 uses
Batch Find and Replace
An online batch find and replace tool that supports both plain text and regular expressions. You can match case, run multiple rules in sequence, and see how many replacements each step made — great for batch text processing and data cleaning.
Office & Study 38 uses
Password Policy Checker
An online password policy checker that validates length, upper/lowercase, digits, symbols and common weak passwords item by item, showing whether each requirement is met with improvement suggestions. It also detects weak common words and repeated or sequential characters and estimates entropy. Handy for account security and compliance checks.
Encoding & Encryption 38 uses
HTTP Security Headers Checker
An online HTTP security headers checker. It fetches a site's response headers and checks each policy such as HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy. You get a score with improvement suggestions, making it a handy tool for hardening a website.
Webmaster Tools 38 uses
Invoice Generator
Create a professional invoice or receipt in your browser. Add line items and taxes with automatic totals, then export or print it as a PDF in seconds.
Office & Study 38 uses
Matrix Calculator
Add, subtract and multiply matrices, or compute the transpose, determinant and inverse. Supports 2×2 to 4×4 matrices with results shown in a clean grid.
Office & Study 38 uses
HTTP Request Client
Debug HTTP APIs right from your browser. Send GET, POST, PUT, DELETE, PATCH and HEAD requests with custom headers and body, then inspect the status code, response time, size, headers and pretty-printed body instantly.
Development 38 uses
LLM API Cost Calculator
Estimate your LLM API costs from input/output tokens and per-model pricing. Pick from built-in prices for GPT, Claude and Gemini, or enter your own rates, then see the cost per call, per day and per month — great for budgeting and batch estimates.
AI 38 uses
AI Chat Format Converter
Convert chat message formats between OpenAI, Claude and Gemini while preserving roles and content. Paste a JSON, let the source format be detected automatically, and get the target format ready to copy — handy for API migration and debugging.
AI 38 uses
License Generator
Create a complete LICENSE file in one click. Choose MIT, Apache-2.0, GPL-3.0, BSD, MPL-2.0, Unlicense and more, fill in the author and year, then copy or download the full license text.
Development 37 uses
Compress Video to Target Size
Compress a video to a target file size or bitrate directly in your browser. Enter the size in MB or a bitrate, and the tool estimates and encodes the video so it fits — ideal for sharing. Local processing, no upload.
Video Processing 37 uses
QR Code Reader
Scan or upload a QR code image to decode the text or link inside. Works with your camera in real time or with an image file. Processed locally, never uploaded.
Image Processing 37 uses
Barcode Generator
Generate EAN-13, Code 128 and Code 39 barcodes in your browser. Just type the content, then export the barcode as SVG or PNG. Everything runs locally, no upload.
Development 37 uses
JSON to Markdown Table
Convert a JSON array into a Markdown table online. Choose which columns to include and set the alignment, then copy the result. Runs fully locally in your browser, with nothing uploaded.
Development 37 uses
SQL Formatter
An online SQL formatter that beautifies or minifies SQL statements with one click, automatically breaking lines before major keywords and optionally converting keywords to uppercase. It supports common syntax such as SELECT, JOIN and INSERT — a must-have for database development and debugging.
Development 37 uses
SQL to DBML
Parse CREATE TABLE DDL into DBML modeling syntax, ready to paste into dbdiagram to draw ER diagrams. Runs locally in your browser, nothing is uploaded.
Development 37 uses
ENV File Tool
Format, deduplicate and sort your .env file in the browser. Detect duplicate keys and format issues, then output a clean .env. Processed locally, never uploaded.
Development 37 uses
OpenAPI Generator
Generate OpenAPI 3 documents in the browser from a JSON structure or field table. Produce compliant API specs to speed up front-end and back-end collaboration. Processed locally.
Development 37 uses
curl to Code
An online curl command converter: turn curl requests into request code for PHP, Python, JavaScript, Go and more with one click. Also parses them into structured parameters — a must-have for API integration and testing.
Development 37 uses
IP Subnet / CIDR Calculator
An online IP subnet mask and CIDR calculator: enter an IP and mask to compute the network address, broadcast address, usable host range and host count. Supports common IPv4 ranges, ideal for network planning and operations.
Webmaster Tools 37 uses
Time Duration Calculator
A free online time duration calculator: add or subtract days, hours, minutes and seconds from a given time, or calculate the interval between two times. Handy for meeting scheduling and countdown planning.
Office & Study 37 uses
JSON ↔ XML Converter
An online JSON and XML converter supporting both directions: JSON to XML and XML to JSON. Customize the root element name and indentation — handy for API integration and data migration.
Development 37 uses
Quoted-Printable Encoder/Decoder
Online Quoted-Printable encoder/decoder for QP encoding and restoration in email and MIME transport, with a configurable line width — useful for fixing garbled Chinese text and reading email source.
Encoding & Encryption 37 uses
Image EXIF Viewer & Remover
An online tool to view and remove EXIF data in images. Read metadata such as shooting date, camera model, aperture, shutter speed and GPS, and strip private information with one click before exporting — handy for privacy protection.
Image Processing 37 uses
Deposit Interest Calculator
A free online deposit interest calculator: enter the principal, annual interest rate and term to instantly compute the interest and the total amount. Supports demand deposits, fixed-term lump-sum deposits and a simplified savings plan, with simple/compound interest switching plus monthly average interest, total amount and approximate days. Ideal for planning bank savings.
Everyday Life 37 uses
CSV Viewer
Online CSV viewer and converter: paste or upload CSV data to view it as a table, with support for custom delimiters. Export the result as JSON, Markdown or an HTML table — great for previewing and cleaning up data.
Office & Study 37 uses
Device Info Detector
An online device and browser information detector that shows your screen resolution, viewport size, device pixel ratio, operating system, browser engine, language, time zone and network status in real time. It is handy for responsive layout debugging and everyday troubleshooting.
Development 37 uses
Random Secret Generator
An online random key generator that creates hex, Base64 and URL-safe secrets and tokens by bit length or character count, with an optional custom charset. Supports batch generation and one-click copy. Useful for key generation and API authentication.
Encoding & Encryption 37 uses
Website Uptime Checker
An online tool for checking website availability and response time. It probes the target URL three times in a row, recording the HTTP status and response time of each attempt, and reports the availability status and average response time along with key details such as the server and content type. Handy for site monitoring and troubleshooting.
Webmaster Tools 37 uses
CSS Unit Converter
An online CSS unit converter between px, rem, em, pt, vw, vh and percentages, with configurable root font size and viewport size. Handy for responsive and mobile adaptation.
Development 37 uses
Bingo Card Generator
Generate bingo cards online with customisable grid sizes and an optional free center. Create several unique random cards at once, then print them or copy/download the results as CSV. Handy for team building and classroom activities.
Fun & Leisure 37 uses
Random Group Generator
Split a list into random teams online, by the number of people per group or by the number of groups. Names are shuffled and distributed as evenly as possible, with an option to keep the original order inside each group. Copy the result in one click—great for team activities and classroom grouping.
Fun & Leisure 37 uses
PDF Split
Split a PDF into separate files or extract specific pages in your browser. Split every N pages or pick a range, then download the results.
Office & Study 37 uses
Keyword Density Analyzer
Analyze keyword density in any text. Get the total word count, top keywords after stop-word removal, occurrence counts and density percentages, with 1–3 word phrases and copyable results.
Webmaster Tools 37 uses
Mixed Content Checker
Detect insecure http:// scripts, styles, images, iframes and media on an HTTPS page. View counts grouped by resource type and get clear guidance to fix mixed content warnings.
Webmaster Tools 37 uses
Code Line Counter
Paste your code to instantly count total lines, blank lines, comment lines and actual lines of code, along with character and byte totals. Supports many languages with automatic comment-style detection — great for gauging project size.
Development 36 uses
.gitignore Generator
Generate a proper .gitignore in seconds by ticking languages, frameworks, editors and operating systems. Built-in, real-world rules for Node, Python, Java, Go, PHP, Ruby, macOS, Windows, VS Code, JetBrains and more, with live output, copy and download.
Development 36 uses
Semantic Version Compare
Compare two version numbers following the SemVer rules, including prerelease precedence, and validate their format. See the parsed major, minor, patch, prerelease and build metadata at a glance — essential for dependency management.
Development 36 uses
CHANGELOG Generator
An online CHANGELOG generator. Paste your entries following the Keep a Changelog spec and sort them into Added, Fixed, Changed and more to produce a version release log.
Development 36 uses
Image Color Picker
Zoom into any image and pick colors from anywhere in your browser. Copy the HEX, RGB and HSL values with one click. Processed locally, never uploaded.
Image Processing 36 uses
Properties to JSON
Convert Java .properties files and JSON online. Handles # and ! comments, = or : separators and escape characters. A quick, free converter that runs fully locally in your browser, with no upload.
Development 36 uses
ID Card Number Parser
A free online ID card number parser: enter an 18-digit number to validate its format and check digit, and extract the region, date of birth and gender. A handy tool for daily verification and data entry.
Everyday Life 36 uses
Classical Cipher Encoder & Decoder
An online classical cipher encoder and decoder supporting the Caesar cipher, Vigenère cipher, Rail Fence cipher and ROT13, with customizable shift, key and rail count. A common tool for learning cryptography and CTF practice.
Encoding & Encryption 36 uses
SQL to MongoDB
Convert common SQL SELECT statements into MongoDB find queries with projection, sort and limit. Handy for database migration, processed locally, never uploaded.
Development 36 uses
Kubernetes YAML Generator
Generate Kubernetes manifests in the browser. Fill in parameters for Deployment, Service and Ingress resources and get usable K8s YAML. Processed locally, never uploaded.
Development 36 uses
Time Zone Meeting Converter
A free online time zone converter for meetings: pick a time and see the matching local time and day/night status for multiple cities and time zones on one screen. Essential for cross-border collaboration and remote meetings.
Office & Study 36 uses
Bank Card Number Validator
A free online bank card number validator that checks whether a card number is valid using the Luhn algorithm and identifies the brand and card type. Useful for data entry verification and payment development.
Office & Study 36 uses
PDF Form Flattener
Turn fillable PDF forms into static content in your browser so the fields can no longer be edited, while keeping the original layout. Runs locally, never uploaded.
Office & Study 36 uses
PDF Signature Tool
Sign a PDF in your browser by drawing a handwritten signature or uploading a signature image, then drag it to the desired spot. Runs locally, never uploaded.
Office & Study 36 uses
PDF Page Crop
Online PDF page cropper: set margins or a crop box visually to batch-crop PDF pages and remove white borders. Processed locally, no upload.
Office & Study 36 uses
PDF Compressor
Resave and streamline a PDF's structure to reduce its file size, with an option to strip metadata. Runs locally in your browser, never uploaded.
Office & Study 36 uses
Base85 Encode & Decode
An online Base85 (Ascii85/Z85) encoder and decoder supporting both Adobe Ascii85 and Z85 formats. Encode binary or text into more compact printable characters, computed locally in your browser with no uploads.
Encoding & Encryption 36 uses
File Hash Checker
An online file hash checker: drag in or select a local file to compute its MD5, SHA-1, SHA-256 and SHA-512 values, and compare them against a known hash to confirm whether they match. Commonly used for file integrity verification.
Encoding & Encryption 36 uses
JSON Schema Validator
An online JSON Schema validator: paste your JSON data and a Schema to check whether it passes, with each error path and reason listed line by line — a handy tool for API development and data validation.
Development 36 uses
Business Card Maker
Online business card maker: fill in your name, job title and contact details to generate a printable card, all processed locally in your browser without uploading.
Office & Study 36 uses
ASCII Table Lookup
An online ASCII table lookup tool that fully displays codes 0-127 with decimal, hexadecimal, octal, binary and character references. Search by character or any code, an essential reference for programming basics.
Development 36 uses
Linux Permission Calculator
An online Linux file permission calculator: tick read, write and execute to convert chmod into numeric and symbolic notation for owner, group and others — a must-have for ops and deployment.
Development 36 uses
Social Insurance & Housing Fund Calculator
A free online social insurance and housing fund calculator for China: enter your pre-tax salary and contribution base to work out the personal and employer contributions to pension, medical, unemployment, work-injury, maternity insurance and the housing provident fund. Choose city presets (Beijing, Shanghai, Guangzhou, Shenzhen), edit each rate, optionally estimate personal income tax and copy the results in one click.
Everyday Life 36 uses
Clothing Size Converter
A free online clothing size converter: choose tops, trousers or shoes and convert by height/weight or by measurement (chest, waist, foot length) to get recommended sizes in Chinese, international, EU, US and UK standards, plus a shoe size chart. A handy reference when shopping across brands and countries.
Everyday Life 36 uses
Pomodoro Timer
A free online Pomodoro timer: focus 25 minutes, take a 5-minute break and a 15-minute long break every 4 rounds, with a clean progress ring, start/pause/skip/reset controls, adjustable durations and a Web Audio completion chime. Track completed pomodoros and rounds to stay focused.
Everyday Life 36 uses
Memory Game
Play a memory card game online. Flip cards to remember where each symbol is and match identical pairs, with live move and time tracking. A fun way to train your memory and unwind.
Fun & Leisure 36 uses
Whack-a-Mole
Play Whack-a-Mole online. Moles pop out of a 3x3 grid of holes at random, and you score points by tapping them as fast as possible within 30 seconds. Your score, remaining time, and high score are shown in real time.
Fun & Leisure 36 uses
Sudoku
Play Sudoku online with randomly generated puzzles in several difficulty levels. Fill the 9×9 grid using the keyboard or mouse, with conflicting numbers highlighted, plus a timer and hints. Popular for training logic and relaxing.
Fun & Leisure 36 uses
Broken Link Checker
Scan a page for links, resolve and de-duplicate them, probe up to 30 with fast HEAD/GET requests, and list each link with its status code while highlighting broken ones.
Webmaster Tools 36 uses
Glassmorphism Generator
Create glassmorphism effects: adjust backdrop blur, background and border opacity, and corner radius, preview on a colorful backdrop, then copy the CSS.
Development 36 uses
JSON Diff
Compare two JSON documents and see every difference at a glance. Added, removed and changed values are highlighted with dotted paths, plus a summary count and an option to ignore array order.
Development 36 uses
PDF Rotate
Rotate the pages of any PDF directly in your browser. Choose all pages or a custom range, pick 90°, 180° or 270°, and download the fixed file — no upload, everything stays on your device.
Office & Study 36 uses
Code to Image
Render any code snippet into a shareable image with syntax highlighting and a window frame. Pick from built-in themes, set the font size and padding, toggle the window dots, and export a crisp PNG for social sharing — everything runs locally on Canvas.
Development 35 uses
GitHub Actions Generator
An online GitHub Actions workflow generator. Visually choose triggers and build steps to generate CI/CD YAML configuration, making automated deployment simpler.
Development 35 uses
SVG Optimizer
Optimize and compress SVG files in your browser by removing metadata, comments and whitespace and simplifying paths. Shrink the file size with no upload.
Development 35 uses
Favicon Generator
Generate a multi-size favicon.ico and PNG icons from an image or text in your browser, then download them as a ZIP. Works with all browsers and devices, processed locally.
Development 35 uses
MongoDB Query Formatter
Beautify or minify MongoDB query JSON in your browser, validate the syntax and copy the result with one click. All processing is local, nothing is uploaded.
Development 35 uses
Database Connection String Parser
Break down MySQL, PostgreSQL, MongoDB or Redis connection URIs into individual fields such as host, port, user and database. Processed locally, never uploaded.
Development 35 uses
Dockerfile Generator
Generate a ready-to-use Dockerfile in the browser. Pick a language or framework to get the base image, dependency install steps and start command. Processed locally, never uploaded.
Development 35 uses
JSON to Code Entities
An online JSON to entity class converter: paste JSON and generate interface structure code for TypeScript, Go, Java and more with one click. Supports nested objects and arrays — a must-have for faster API integration.
Development 35 uses
Code Formatter & Minifier
An online code formatting and minification tool that supports beautifying and compressing XML, HTML, CSS and JavaScript. You can customize the indentation and clean up messy code or reduce file size with a single click — a handy utility for both front-end and back-end development.
Development 35 uses
User-Agent Parser
An online User-Agent parser: paste a UA string to identify the browser, version, operating system, device type and rendering engine. Quickly determine the visitor's origin; useful for compatibility troubleshooting and data analysis.
Webmaster Tools 35 uses
Accessibility Checker
Check the accessibility of an HTML snippet online. Detect images without alt text, form controls without labels, heading level skips and links lacking readable text. Runs locally, nothing uploaded.
Webmaster Tools 35 uses
Developer Command Cheatsheet
Online developer command cheatsheet covering common Git, Linux, Docker, Redis and MySQL commands, with keyword search and one-click copy — essential for daily development and operations.
Development 35 uses
SEO Checklist
Interactive SEO checklist online. Tick off title length, meta description, keyword density, internal links and image alt items to get a live score with suggestions. Runs locally, nothing uploaded.
Webmaster Tools 35 uses
SEO Content Analyzer
Analyse SEO content online. Count keyword occurrences and density, measure title and description length with approximate pixel width, and get optimisation tips. Runs locally, nothing uploaded.
Webmaster Tools 35 uses
PDF Form Data Import/Export
Export PDF form fields to JSON or batch-fill them from JSON in your browser. Runs locally, never uploaded.
Office & Study 35 uses
Compound Interest Calculator
An online compound interest and regular investment calculator. Enter the principal, annual return rate, term and periodic contributions to get the final balance and earnings. Supports monthly or yearly compounding — a handy tool for financial planning.
Everyday Life 35 uses
Year-End Bonus Tax Calculator
An online year-end bonus tax calculator. Computes the tax payable and take-home amount using the separate taxation method for annual one-time bonuses, and flags the threshold points. Useful for year-end bonus planning.
Everyday Life 35 uses
Lunar & Gregorian Date Converter
An online lunar and Gregorian date converter that converts dates both ways between the Gregorian and Chinese lunar calendars, showing the corresponding lunar date, Chinese zodiac and sexagenary year — handy for traditional festivals and birthdays.
Everyday Life 35 uses
Extract PDF Pages
Pull specific pages from a PDF by page number or range, or invert your selection, to build a new document. Runs locally in your browser, never uploaded.
Office & Study 35 uses
Fill PDF Forms
Detect the fields in a fillable PDF, fill them in and export the completed file, optionally flattening the form. Runs locally in your browser, never uploaded.
Office & Study 35 uses
PDF Header & Footer
Add custom header and footer text to every page of a PDF, including page numbers and total pages. Runs locally in your browser, never uploaded.
Office & Study 35 uses
PDF Resize
Online PDF resize tool: scale or fit every page to A4, Letter or a custom paper size, all processed locally in your browser without uploading.
Office & Study 35 uses
PDF Stamp & Watermark
Online PDF stamp tool: add text or image watermarks and stamps at a specified position on pages, all processed locally in your browser without uploading.
Office & Study 35 uses
Color Contrast Checker
An online color contrast and palette tool: enter foreground and background colors to calculate the WCAG contrast ratio, judge whether AA/AAA levels pass, and get color suggestions — handy for front-end accessibility and color design.
Development 35 uses
Installment APR (IRR) Calculator
A free online installment interest-rate calculator: enter the loan principal, the amount paid per period, the number of periods and any one-off upfront fee to solve the real annualized rate (IRR). It also shows the monthly rate, nominal annual rate, total repayment and total interest — ideal for checking the true cost of installment loans and consumer credit.
Everyday Life 35 uses
Menstrual Period Calculator
A free online menstrual period calculator: enter the first day of your last period, your average cycle length and period length to predict your next period, the estimated ovulation day, fertile window and safe periods, with a 6-month forecast table. A handy reference for cycle tracking (not medical advice).
Everyday Life 35 uses
Kaomoji Collection
Online kaomoji collection with hundreds of cute emoticons. Browse by category or search by keyword, and copy any face with a single click—perfect for chatting and social media.
Fun & Leisure 35 uses
Aspect Ratio Calculator
An online aspect ratio and size conversion tool. Enter a ratio and one known dimension to instantly get the other value in pixels, with built-in presets such as 16:9, 4:3, and 1:1. Ideal for design mockups and image resizing.
Development 35 uses
Roman Numeral Converter
An online Roman numeral converter that translates between Arabic numbers and Roman numerals in both directions. It validates input automatically, supports the 1–3999 range, and shows the conversion, making it useful for learning and practice.
Office & Study 35 uses
Nginx Config Generator
An online Nginx config generator that visually produces common server blocks: static site setup, reverse proxy, HTTPS redirect, Gzip compression and caching rules. Just fill in the domain, port and options and the configuration updates in real time, ready to copy. Handy for server deployment and ops.
Webmaster Tools 35 uses
.htaccess Generator
An online .htaccess rule generator that visually configures 301 redirects, forced HTTPS, hotlink protection, caching and compression headers, and custom error pages. Tick the options you need and the rules are generated and ready to copy. Commonly used for configuring Apache sites.
Webmaster Tools 35 uses
Basic Auth Generator
An online Basic Auth generator: enter a username and password to instantly get an encrypted htpasswd entry ({SHA} format) and the HTTP Authorization header. Handy for website access control and API debugging.
Webmaster Tools 35 uses
User-Agent Generator
An online User-Agent generator that freely combines browser, version, operating system and device type into a UA string. It covers common mobile and desktop combinations, handy for API testing and crawler debugging.
Webmaster Tools 35 uses
RSS/Atom Generator
Generate standards-compliant RSS and Atom feeds online. Enter your site details and a list of articles, set the title, link, publish time and summary, then copy or download the XML in one click. A handy tool for blogs and content distribution.
Office & Study 35 uses
otpauth URI Generator
An online otpauth link generator: enter the issuer, account and a Base32 secret to build a standard otpauth:// URI that imports easily into Google or Microsoft Authenticator. Choose the algorithm, digits and period, and validate the Base32 secret. Useful for setting up two-factor authentication.
Encoding & Encryption 35 uses
Redirect Chain Checker
An online redirect chain checker. Enter a URL to trace every 301/302/303/307/308 hop and see the status code, target address and response time for each step. It helps you spot broken redirects and redirect loops, which is handy for SEO audits and site migrations.
Webmaster Tools 35 uses
robots.txt Viewer
An online robots.txt viewer. Enter a domain to fetch and parse the site's robots.txt, showing Allow/Disallow rules grouped by User-agent along with Sitemap URLs and crawl delay. It's a handy tool for checking crawler rules and doing SEO checks.
Webmaster Tools 35 uses
DNS Records Lookup
An online DNS records lookup tool that queries a domain’s A, AAAA, CNAME, MX, TXT, NS and other records all at once, showing the host, type, TTL and value together. Commonly used for DNS troubleshooting and configuration verification.
Webmaster Tools 35 uses
Webpage Info Extractor
An online webpage information extractor: enter a URL to fetch the page title, description, keywords, favicon and Open Graph metadata, so you can quickly review a page’s basic SEO information. Commonly used for site analysis and competitor research.
Webmaster Tools 35 uses
HTML Minifier
An online HTML/CSS/JS minifier that removes HTML comments, extra whitespace and line breaks and can compress inline CSS/JS to shrink page size. Handy for front-end optimization and code cleanup.
Development 35 uses
Pace Calculator
An online running pace calculator that converts between distance, time and pace in any direction. Supports kilometres or miles and common race presets (5K, 10K, half and full marathon). It shows your pace in min:sec per unit and your speed — handy for running and marathon training.
Everyday Life 35 uses
Overtime Pay Calculator
An online overtime pay calculator: based on your monthly salary and overtime hours, it applies 1.5x (weekdays), 2x (rest days) and 3x (statutory holidays) rates and gives the total. Handy for checking labor remuneration.
Everyday Life 35 uses
BMR & TDEE Calculator
An online basal metabolic rate (BMR) and daily expenditure (TDEE) calculator. Using the Mifflin-St Jeor formula with gender, age, height, weight and activity level, it estimates your daily calorie needs and shows maintenance, fat-loss (-500) and muscle-gain (+300) targets. Great for diet and fitness planning.
Everyday Life 35 uses
Statistics Calculator
Paste a list of numbers to compute count, sum, mean, median, mode, range, quartiles, IQR, variance and standard deviation. Copy the result in one click.
Office & Study 35 uses
Prime Factorization
Factor any positive integer into primes and see the factorisation formula, prime list, divisor count and sum, and a prime check. Show all divisors.
Office & Study 35 uses
Webhook Tester & Receiver
Capture and inspect incoming webhook requests in real time. Get a unique public callback URL, watch payloads arrive instantly, and view headers, query strings and bodies — perfect for debugging integrations like GitHub, Stripe and custom APIs.
Development 35 uses
JSON Schema Generator
Turn any sample JSON into a clean draft-07 JSON Schema in one click. Types, nested objects, arrays, required fields and formats are inferred automatically, ready to copy or download.
Development 35 uses
PDF Watermark
Stamp a clean text watermark on every page of your PDF right in the browser. Pick the text, color, opacity, angle and a centered or tiled layout, then download instantly — no upload, no sign-up.
Office & Study 35 uses
Makefile Generator
An online Makefile generator. Fill in targets and commands for your tasks to produce a clean Makefile, with support for variables and phony targets — writing build scripts made easier.
Development 34 uses
SVG to PNG
Render an SVG into a PNG at a chosen size or scale in your browser. Supports transparent backgrounds and exporting multiple resolutions. Processed locally.
Image Processing 34 uses
PHP Serialize Converter
Convert between PHP serialize strings and JSON in your browser. Inspect or rebuild serialized data for API debugging and migrations. Runs locally, nothing is uploaded.
Development 34 uses
JSON to YAML Converter
A free online tool to convert between JSON and YAML. Turn JSON into YAML or restore YAML back to JSON with automatic syntax validation and error hints — handy for config files and development debugging.
Development 34 uses
CSV to SQL
Convert CSV data into SQL INSERT statements online. Parses quoted fields and escaped characters, and lets you set the table name and header row. Runs fully locally in your browser, with no upload.
Development 34 uses
Redis Command Builder
Build well-formed Redis CLI commands by choosing a data type and command and filling in the arguments. Runs entirely in your browser, no data is uploaded.
Development 34 uses
RMB Amount in Chinese Uppercase
An online RMB amount to Chinese uppercase converter: enter a numeric amount to get the standard Chinese uppercase form (e.g. 壹仟贰佰叁拾肆元伍角陆分), supporting yuan/jiao/fen and negative numbers. Commonly used for financial reimbursement and filling in contracts.
Office & Study 34 uses
ER Diagram Generator
Generate Mermaid erDiagram code from SQL DDL statements to visualize table relationships instantly. Everything runs locally in your browser, never uploaded.
Development 34 uses
HTTP Signature Generator
Generate API signatures in the browser. Sort and join parameters, then sign with MD5, HMAC-SHA256 or SHA256 using custom rules. Processed locally, nothing is uploaded.
Development 34 uses
robots.txt Generator
An online robots.txt generator that lets you visually configure Allow/Disallow rules, Sitemap URLs and crawl delay, and generate a standards-compliant robots.txt in one click. A must-have for SEO and crawler management.
Webmaster Tools 34 uses
Online To-Do List
A free online to-do list: quickly add tasks, check them off and delete them, set priorities and save everything locally. Your list survives page refreshes and stays only in your browser — simple and efficient.
Office & Study 34 uses
Social Share Card Generator
An online tool to preview and generate social share cards (OG / Twitter Card). Fill in the title, description, site and image visually, preview the share result in real time, and generate the corresponding meta tags — a must for social optimization.
Webmaster Tools 34 uses
Cron Expression Generator
An online Cron expression generator. Pick minute, hour, day, month and weekday rules visually to build a Cron expression, and preview the next few run times in real time — a must for scheduling tasks.
Development 34 uses
Punycode Domain Encoder/Decoder
Online Punycode domain encoder/decoder supporting internationalized domain names (IDN) such as Chinese, converting between IDN and the xn-- Punycode form — commonly used for domain registration and resolution.
Encoding & Encryption 34 uses
Discount Calculator
An online discount calculator. Enter the original price and a discount rate or a reduced price to instantly get the final price and the amount saved. Supports stacked discounts — handy for comparison shopping and promotions.
Everyday Life 34 uses
Bill Splitter (AA)
An online bill splitter. Enter the total amount and the number of people to work out how much each person pays, with remainder handling and per-person details. Great for settling group bills and splitting costs.
Everyday Life 34 uses
Insert Blank Pages into PDF
Insert one or more blank pages at any position in a PDF and set their size and count. Runs locally in your browser, never uploaded.
Office & Study 34 uses
PDF Metadata Editor
Edit a PDF's document properties such as title, author, subject and keywords. Runs locally in your browser, never uploaded.
Office & Study 34 uses
PDF Page Reorder
Online PDF page reorder tool: drag pages to rearrange the order, remove unwanted pages, then export, all processed locally in your browser without uploading.
Office & Study 34 uses
SQL to Entity Class
An online SQL to entity class generator: paste a CREATE TABLE statement to produce entity code in TypeScript, Go, Java and more, automatically mapping field types and comments — a productivity booster for backend development.
Development 34 uses
Server Config Generator
An online server configuration generator that visually creates .htaccess redirects, Nginx reverse proxy blocks, .gitignore and .env templates with one-click copy — a handy tool for website deployment and project setup.
Development 34 uses
MIME Type Lookup
An online MIME type lookup tool that finds the Content-Type for a file by extension or type. It covers common documents, images, audio/video and archives — handy for download response headers and front-end uploads.
Development 34 uses
URL Slug Generator
Online URL slug generator: turn a title into a clean, SEO-friendly URL slug. Choose the separator, the letter casing and whether to keep Chinese characters; accents and non-alphanumeric characters are stripped automatically. Commonly used for blog and CMS permalinks.
Development 34 uses
Braille Converter
An online Braille converter that turns English letters, numbers and common punctuation into their corresponding Braille Unicode characters, with reverse conversion back to text. Great for learning Braille and accessibility studies.
Encoding & Encryption 34 uses
2048 Game
Play the 2048 number puzzle online. Use the arrow keys or swipe to merge matching tiles and reach 2048, with undo and restart support. A relaxing brain teaser for any break.
Fun & Leisure 34 uses
DNS Record Generator
An online DNS record generator: visually fill in the host, type and value for A, AAAA, CNAME, MX, TXT, CAA and other records to produce a standard record configuration you can copy in one click. A handy tool for domain DNS setup.
Webmaster Tools 34 uses
ASCII Art Text Generator
Turn plain text into stylish ASCII art banners online. Choose from several font styles, adjust the fill character and width, then copy the multi-line result with one click. Great for code comments, terminals and social posts.
Office & Study 34 uses
ULID Generator
Generate ULIDs online: 26-character, time-ordered identifiers in Crockford Base32 that sort lexicographically. Batch-generate up to 50 at once and switch between uppercase and lowercase. Commonly used as database primary keys and distributed IDs.
Encoding & Encryption 34 uses
PBKDF2 Key Derivation
An online PBKDF2 key derivation tool that uses the browser's Web Crypto to derive a key of any length from a password, salt and iteration count, with SHA-1/256/512 and Hex or Base64 output. Ideal for cryptography learning and secure development.
Encoding & Encryption 34 uses
TOML to JSON
An online TOML ↔ JSON converter supporting [table], arrays and common types such as strings, numbers, booleans and dates in both directions. Handy for migrating and reading configuration files.
Development 34 uses
INI to JSON
An online INI ↔ JSON converter supporting comments, sections and key-value parsing, compatible with both equals and colon separators. Handy for reading, writing and migrating configuration.
Development 34 uses
Regex Cheat Sheet
An online regular expression cheat sheet listing common metacharacters, quantifiers, character classes, groups, assertions and flags by category, with common examples (email, phone, URL, date, IP). Supports keyword filtering and one-click copy.
Development 34 uses
GPA Calculator
An online GPA and grade-point calculator: add courses with credits and grades (percentage or letter) to compute your weighted average GPA. Switch between 4.0, 4.3 and 100-point scales with common conversion tables. Great for study-abroad applications and academic assessment.
Everyday Life 34 uses
Fuel Cost Calculator
An online fuel consumption and cost calculator: enter distance, fuel amount and price to get L/100km, cost per kilometre and total fuel cost. You can also work backwards from consumption, distance and price to estimate the cost. Useful for running-cost tracking and long-trip budgets.
Everyday Life 34 uses
Structured Data Generator
Generate JSON-LD structured data for Article, Product, FAQPage, BreadcrumbList, Organization or LocalBusiness. Fill in a dynamic form and copy the ready-to-use schema markup.
Webmaster Tools 34 uses
CSS Animation Generator
Build CSS animations from presets (fade, slide, scale, rotate, bounce, pulse, shake): tweak timing, easing, loop and direction, preview and copy the CSS.
Development 34 uses
Delete PDF Pages
Remove unwanted pages from a PDF right in your browser. Enter the pages to delete, see how many will remain, then download the trimmed file — no upload, everything stays on your device.
Office & Study 34 uses
JSON to SQL
Turn JSON data into SQL online. Analyse the object or array, infer field types and generate CREATE TABLE plus INSERT statements. Fast, free and fully local in your browser, with no upload.
Development 33 uses
Base32 Encode & Decode
An online Base32 encoder and decoder following the RFC 4648 standard, supporting Base32 encoding and decoding of Chinese and any text, with optional "=" padding. Commonly used for key and token handling.
Encoding & Encryption 33 uses
Website Favicon Fetcher
An online website favicon tool: enter a domain to preview and obtain the site's favicon URL, with several common paths and high-resolution icon services. Handy for link exchanges and directory sites.
Webmaster Tools 33 uses
Workday Calculator
A free online workday calculator that counts the number of working days between two dates. It automatically excludes weekends and lets you add custom holidays and make-up workdays — ideal for attendance, project scheduling and leave planning.
Office & Study 33 uses
Naming Style Converter
An online naming style converter that switches variable names between camelCase, snake_case, kebab-case, PascalCase, CONSTANT_CASE and more with one click. Handles case and digits — a great helper for code style cleanup.
Development 33 uses
hreflang Tag Generator
Generate hreflang tags online. Enter the language versions and URLs of a multilingual site to produce correct alternate hreflang link tags and avoid duplicate content. Runs locally, nothing uploaded.
Webmaster Tools 33 uses
PDF Redaction Tool
Black out or keyword-locate sensitive text in a PDF in your browser, optionally removing the underlying content to protect privacy. Runs locally.
Office & Study 33 uses
PDF Page Label
Online PDF page label tool: add Bates-style labels to every page with a configurable prefix, start number and format. Ideal for document archiving and citation. Processed locally.
Office & Study 33 uses
Due Date Calculator
An online due date calculator. Enter the last menstrual period or the conception date to estimate the due date, current gestational age and days remaining, with reference notes for each stage. Useful for tracking pregnancy and preconception planning.
Everyday Life 33 uses
Calorie Calculator
An online calorie calculator that estimates your daily basal metabolic rate and calorie needs from height, weight, age, gender and activity level, with fat-loss and muscle-gain references — handy for healthy diet management.
Everyday Life 33 uses
Percentage Calculator
An online percentage calculator with several modes: find what a percentage of a number is, what percent one number is of another, and the percentage increase or decrease between two values. It computes instantly as you type and shows the formula used, which is handy for study, shopping, and finance.
Office & Study 33 uses
Online Stopwatch
An online stopwatch and timer with start, pause, reset and lap recording. It measures to the millisecond and logs multiple split times, ideal for sports timing, experiments and focus sessions.
Office & Study 33 uses
NanoID Generator
Generate URL-safe random short IDs online with NanoID. Customize the count, length and alphabet, with a URL-safe A-Za-z0-9_- set by default. They are compact with a very low collision probability, making them popular for unique identifiers in front-end and back-end code.
Encoding & Encryption 33 uses
Pixel Art Editor
Draw pixel art online on a grid, picking colors from a palette or a custom picker. Switch between brush and eraser, toggle grid lines and clear or undo as needed, then export your work as a PNG or copy the pixel data. Great for pixel creation and doodling.
Fun & Leisure 33 uses
Video to Audio
Extract the audio track from any video right in your browser. Preview the waveform, then export it as WAV or MP3 and download — completely local and private.
Video Processing 33 uses
OpenAPI / Swagger Viewer
Turn any OpenAPI or Swagger specification into a clear, readable API reference. Paste JSON or YAML, or upload a file, to instantly browse servers, endpoints, parameters, request bodies and responses — with colored method badges and quick search.
Development 33 uses
Add PDF Page Numbers
Insert page numbers into any PDF in your browser. Pick the position, format, starting number, font size, margin and color, then download — no upload, everything stays on your device.
Office & Study 33 uses
Image to SVG
Convert a bitmap image into a scalable SVG in your browser by tracing it into vector paths. Adjust the edge threshold and number of colors. Processed locally, never uploaded.
Image Processing 32 uses
Base64URL Encode & Decode
An online URL-safe Base64 (Base64URL) encoder and decoder that replaces +/ with -_ and removes the equals padding, ideal for JWTs, URL parameters and file names. Everything is computed locally without uploading.
Encoding & Encryption 32 uses
docker-compose Generator
Build a docker-compose.yml visually in the browser. Add or remove services and set images, ports, volumes and environment variables, then generate the compose file. Processed locally.
Development 32 uses
Audio Speed & Pitch Changer
Change the speed and pitch of any audio in your browser. Adjust playback speed and transpose the pitch in semitones independently, preview the result, then export it as a WAV — all processed locally without uploading.
Audio Processing 31 uses
Love Calculator
A fun online love calculator: enter two names and a playful deterministic algorithm instantly computes a 0–100 love score for the pair, with a progress bar and a matching comment from "perfect match" to "hardly a match". The result is for entertainment only—great for chatting and games with friends.
Fun & Leisure 31 uses
Scientific Notation Converter
Convert between decimal numbers and scientific notation online, in both directions, with optional significant digits and engineering notation. Large numbers use string math, fully local.
Education & Science 30 uses
Lucky Draw Wheel
An online lucky draw wheel: customize the options, generate a colorful spinning wheel and click to draw a random result. Great for making decisions, picking names and event raffles — simple and fun.
Fun & Leisure 30 uses
Embedding Cost Calculator
Estimate the cost of embedding calls from document count, average length and model price. Includes built-in prices for popular models and knowledge-base scale projections.
AI 29 uses
Chinese Numeral Converter
Convert between Arabic digits and Chinese numerals in your browser. Choose lowercase or formal uppercase amounts and an optional ordinal form like 第. Everything is processed locally, never uploaded.
Chinese Text 29 uses
Audio Joiner
Join several audio files into one in your browser. Add two or more tracks, reorder them with up/down controls, then merge them in sequence and export a single WAV — all processed locally without uploading.
Audio Processing 27 uses
Image Slicer
Slice one large image into a grid of smaller images in your browser and download them as a ZIP. Great for sprite sheets and 3x3 grid covers. Processed locally.
Image Processing 27 uses
DNS Lookup
A free online DNS lookup tool supporting A, AAAA, CNAME, MX, TXT, NS, SOA and CAA records. Enter a domain to instantly get its resolution results and quickly troubleshoot domain, email and website configuration issues.
Webmaster Tools 27 uses
Physics Formula Calculator
Solve common physics formulas online: speed, acceleration, force, work, power, Ohm's law, density and kinetic energy. Enter the known values, leave the unknown blank. Runs locally.
Education & Science 27 uses
Markdown to Prompt
Turn a Markdown document into a clean, well-structured prompt. Heading levels, lists and code blocks are preserved, and you can prepend or append instructions before copying.
AI 26 uses
Name Format Converter
Convert names between family-name-first and given-name-first orders, plus a surname, given-name form. Handles Chinese compound surnames and English names, fits author bylines and submissions.
Chinese Text 26 uses
Audio Format Converter
Convert audio files between popular formats right in your browser. Re-encode to WAV or MP3, choose bitrate and channels, then download — no upload required.
Audio Processing 26 uses
Resume Builder
Build a clean, professional resume in your browser with live preview. Fill in your details, experience, education and skills, then export or print as PDF.
Office & Study 26 uses
System Prompt Library
A curated library of system prompt templates for writing, coding, translation, customer support and more. Copy in one click or edit before use.
AI 25 uses
SSL Certificate Checker
A free online SSL certificate checker: enter a domain to view the certificate issuer, validity period, remaining days and supported protocols, and quickly tell whether an HTTPS certificate is valid or about to expire.
Webmaster Tools 24 uses
Chinese Word Frequency Counter
Count how often each word appears in Chinese text, sorted from most to least frequent, with an optional stop-word filter. Ideal for content analysis, runs locally and never uploads your text.
Chinese Text 24 uses
Typing Speed Test
An online typing speed test with random English and Chinese texts that tracks your speed, accuracy and time in real time — handy for practice and assessment.
Fun & Leisure 24 uses
Subtitle Format Converter
Convert subtitle files between SRT, WebVTT and ASS formats while keeping the timeline and basic styling. A fast, free online converter that runs entirely in your browser, so nothing is ever uploaded.
Video Processing 23 uses
Audio Waveform Generator
Free online audio waveform generator: turn any MP3, WAV or OGG file into a clear waveform image with adjustable zoom and colors, then export it as a PNG. Processed locally, never uploaded.
Audio Processing 23 uses
Dice Roller, Coin Flip & Rock-Paper-Scissors
Online dice roller, coin flip and rock-paper-scissors tool. A single click gives you a random result with animation—great for making decisions and having fun.
Fun & Leisure 23 uses
Sparkline Generator
Create compact sparklines from a list of numbers in seconds. Fine-tune area fill, last-point and min/max markers, line width, color and size, then copy the inline SVG or download as SVG or PNG — no upload.
Charts & Data Viz 23 uses
Audio Mixer & Merger
Free online audio mixer: add multiple audio files, adjust each track’s volume, and mix them into one combined track, export as WAV. Everything is processed locally in your browser and never uploaded.
Audio Processing 22 uses
AES Encrypt & Decrypt
An online AES symmetric encryption tool supporting AES-CBC and AES-GCM modes with 128/192/256-bit keys. Customize the key and IV; everything is computed locally in your browser and never uploaded, making it safe and efficient.
Encoding & Encryption 22 uses
Molar Mass Calculator
Calculate the molar mass of any chemical formula online. Parse elements, parentheses and hydrates to get the total molar mass and the elemental mass fractions. Runs locally in your browser.
Education & Science 22 uses
Significant Figures Calculator
Identify the number of significant figures in a value and round it to any number of sig figs online. Ideal for lab data and science homework, computed locally in your browser.
Education & Science 22 uses
Simple Expense Tracker
A free online expense tracker: record income and expenses by date, get an automatic balance and organise entries by category with notes. Data is stored locally in your browser — a handy tool for daily bookkeeping and budgeting.
Office & Study 22 uses
Reaction Time Test
Online reaction speed test: click as soon as the screen turns green to measure your reaction time in milliseconds, with multiple results and an average—handy for fun tests and reaction training.
Fun & Leisure 22 uses
Text to Speech
Convert text into natural speech in your browser. Choose a voice and language, fine-tune rate, pitch and volume, then play or pause it aloud instantly.
Audio Processing 22 uses
Stable Diffusion Prompt Builder
Build Stable Diffusion and Midjourney prompts visually: pick tags for subject, style, lens, lighting, quality and negative prompts, add your own tags, set weights like (word:1.2), and copy the finished positive and negative prompts in real time.
AI 21 uses
Video Watermark
Add a text or image watermark to any video right in your browser. Choose the position, size, opacity and colour, then export a watermarked WebM file — fully local, with nothing uploaded.
Video Processing 21 uses
Audio BPM Detector
Free online audio BPM detector: estimate a track’s tempo in beats per minute for music production and editing. Runs fully in your browser — processed locally, never uploaded.
Audio Processing 21 uses
Audio Silence Cutter
Free online audio silence cutter: automatically detect and remove silent parts to shorten a recording, with adjustable threshold and minimum length. Export as WAV — processed locally, never uploaded.
Audio Processing 21 uses
TOTP Code Generator
An online TOTP code generator following the RFC 6238 standard. Enter a Base32 secret to generate 6-digit codes identical to Google and Microsoft Authenticator and see the remaining validity time, ideal for two-factor authentication debugging.
Encoding & Encryption 21 uses
Probability & Combinatorics Calculator
Calculate permutations A(n,k), combinations C(n,k) and factorials online, plus binomial probabilities. Exact big-integer results and formulas are shown, computed locally in your browser.
Education & Science 21 uses
SRT Subtitle Editor
Edit SRT subtitles visually in your browser: adjust each cue's timeline and text, preview the result, change durations and fine-tune in bulk. Everything runs locally, nothing is uploaded.
Video Processing 20 uses
Subtitle Merger & Splitter
Merge several subtitle files into one, or split a long subtitle into multiple files by time or by cue count. Cues are reindexed automatically and everything is processed locally without uploading.
Video Processing 20 uses
Video Merger
Merge multiple videos into one by joining them in any order. Reorder the clips, then combine and export a single WebM file directly in your browser — no upload, no server, no watermark.
Video Processing 20 uses
Periodic Table of Elements
Browse the periodic table of all 118 elements online. View atomic number, symbol, name, relative atomic mass and category, with instant search and category filters. Runs locally.
Education & Science 20 uses
Bar Chart Generator
Create clean bar charts and grouped bar charts from plain text right in your browser. Switch between vertical and horizontal bars, tweak colors, value labels and grid, then download as crisp SVG or high-resolution PNG — nothing is uploaded.
Charts & Data Viz 20 uses
Pie Chart Generator
Turn simple lists into attractive pie and donut charts right in your browser. Adjust colors, legend position and percentage labels, set the inner radius, then export as crisp SVG or high-resolution PNG — fully private, no upload.
Charts & Data Viz 20 uses
AI Chat Export
Export AI conversations as clean Markdown or styled HTML. Supports role labels and keeps code blocks intact — perfect for archiving or sharing.
AI 19 uses
Quadratic Equation Solver
Solve quadratic equations online. Enter coefficients a, b and c to get the discriminant, the real or complex roots and the full solution steps. Runs locally in your browser, nothing is uploaded.
Education & Science 19 uses
CSV to Chart
Paste CSV data or load a file and instantly get a line, bar or pie chart. Pick the label and value columns, toggle legend, values and grid, and download as SVG or PNG — all client-side, nothing uploaded.
Charts & Data Viz 19 uses
Chinese Address Parser
Parse a Chinese address online into province, city, district and street. Built-in 34 province-level regions and common suffix rules. Runs locally in your browser.
Chinese Text 18 uses
Page Speed Checker
Measure a page’s response status, total load time, content size, server and content type, count scripts, styles, images and iframes, and get a 0–100 performance score with suggestions.
Webmaster Tools 18 uses
Line Chart Generator
Turn plain numbers into polished line charts right in your browser. Add one or more series, customize the title, palette, grid and smooth curves, then export as crisp SVG or high-resolution PNG — no upload, no sign-up.
Charts & Data Viz 18 uses
AI Token Counter
Free online AI token counter: paste any text to instantly estimate the input token count for GPT, Claude, Gemini and other LLMs. Handles mixed Chinese/English content and shows characters, words, estimated tokens and per-model cost — ideal for prompt debugging and cost estimation.
AI 18 uses
Subtitle Time Shifter
Shift subtitle timing forward or backward, or scale it proportionally, to fix audio that is out of sync. Supports positive and negative offsets and runs fully locally in your browser, with no upload.
Video Processing 17 uses
Date Calculator
A free online date calculator: find the number of days between two dates, or add and subtract days, weeks, months or years from a given date and see the resulting weekday. Ideal for scheduling and anniversary planning.
Office & Study 17 uses
HMAC Generator
An online HMAC calculator supporting five algorithms — HMAC-MD5, SHA1, SHA256, SHA384 and SHA512. Enter the text and key to generate a hexadecimal or Base64 signature, a must-have for API signature verification and data integrity checks.
Encoding & Encryption 17 uses
Chinese to Pinyin Converter
Convert Chinese characters into pinyin right in your browser, with tone marks, numbered tones or none, plus full pinyin, initials and finals modes. Runs locally, never uploaded.
Chinese Text 17 uses
Radar Chart Generator
Turn your data into a clean radar chart right in the browser. Enter one axis per line, adjust grid levels, palette and multiple series, then export as SVG or PNG — no upload required.
Charts & Data Viz 17 uses
Text Summarizer
Extractive text summarizer that runs entirely in your browser. It scores sentences by word frequency and position to pull out the key points and produce a Chinese or English summary — great for skimming long texts.
AI 16 uses
Keyword Extractor
Extract high-frequency and topic keywords from any text using word frequency and TF-IDF, all locally in your browser. Works with Chinese and English — handy for SEO and content analysis.
AI 16 uses
Chinese to Pinyin Slug
Turn a Chinese title into a clean, URL-friendly pinyin slug in your browser. Choose the separator, convert to lowercase and get a ready-to-use link. Runs locally, never uploaded.
Chinese Text 16 uses
Video Frame Extractor
Grab clean still frames from any video right in your browser. Choose interval, fixed count or custom timestamps, then export as PNG or JPG — no upload and no software.
Video Processing 16 uses
Chinese Word Segmentation
Split a Chinese sentence into words in your browser using a built-in dictionary and forward maximum matching. Pick a word separator and copy the result. Works offline, never uploaded.
Chinese Text 15 uses
Chinese Text Statistics
Count characters, Chinese characters, punctuation, paragraphs, sentences and estimated reading time of Chinese text in real time. A handy tool for writing and submissions, processed locally.
Chinese Text 15 uses
Fortune Stick Divination
An online fortune-stick (omikuji) divination tool: click to shake the tube and draw a random slip that reveals its slip number, a four-line poem and an interpretation, across several fortune levels shown in different colors. Fully animated and just for fun—great for a light-hearted moment of relaxation.
Fun & Leisure 15 uses
Subtitle Text Cleaner
Clean subtitle text in bulk: remove ad lines, blank lines and duplicates, and unify punctuation and letter case. Ideal for tidying up SRT, VTT or ASS files locally in your browser, with no upload.
Video Processing 14 uses