A curated collection of free tools to boost your productivity
Free online JSON formatter with syntax highlighting, error detection & minification. Beautify JSON data instantly, detect format errors, boost your development workflow.
Data FormattingFree online XML formatter with auto-indentation, validation & minification. Customize indentation settings, quickly detect XML format errors.
Data FormattingFree online YAML formatter with syntax checking, auto-indentation & format conversion. Handle config files easily, spot syntax issues instantly.
Data FormattingFree online HTML formatter with code beautification, minification & syntax highlighting. Clean up messy HTML code instantly, improve readability.
Data FormattingFree online CSS formatter with code beautification, minification & syntax highlighting. Organize CSS stylesheets instantly, optimize frontend code quality.
Data FormattingFree online JavaScript formatter with code beautification, minification & syntax checking. Clean up JS code instantly, improve code readability.
Data FormattingFree online SQL formatter with code beautification, minification, keyword case conversion & syntax highlighting. Clean up SQL statements instantly, improve code readability.
Data FormattingFree online Base64 encoder & decoder supporting UTF-8 text, Chinese characters & images. Real-time encoding/decoding, no installation needed, privacy-first local processing.
Encoding & DecodingFree online JSON escape tool for quick JSON string escaping and unescaping. Handle quotes, newlines, tabs and special characters, easy code embedding.
Encoding & DecodingFree online image to Base64 converter with drag-and-drop upload, real-time preview & multiple image formats. Embed images in code, reduce HTTP requests.
Encoding & DecodingFree online image compression tool supporting JPEG, PNG, WebP formats with adjustable quality and dimensions. Browser-based local processing, privacy protected.
Encoding & DecodingFree online image to WebP converter. Convert JPG, PNG, GIF to WebP format for smaller size and better quality. Browser-based local processing, privacy protected.
Encoding & DecodingFree online image format converter. Convert between JPG, PNG, WebP, BMP, GIF formats with adjustable quality. Browser-based local processing, privacy protected.
Encoding & DecodingFree online image watermark tool. Add text or image watermarks with adjustable position, opacity, and size. Browser-based local processing, privacy protected.
Encoding & DecodingFree online image grayscale converter. Convert color images to black and white effect. Supports batch processing, browser-based local processing, privacy protected.
Design ToolsFree online URL encoder & decoder handling special characters & Chinese parameters. Convert URL parameters instantly, fix encoding issues, ensure correct data transmission.
Encoding & DecodingFree online HTML entity encoder & decoder converting special characters to HTML entities. Prevent XSS attacks, ensure safe HTML display.
Encoding & DecodingFree online Unicode encoder & decoder supporting multiple formats: \uXXXX, &#xXXXX;, etc. Handle internationalized text easily, solve encoding issues.
Encoding & DecodingFree online hash generator supporting MD5, SHA-1, SHA-256, SHA-512 algorithms. Generate text hashes instantly for data verification and password storage.
Security ToolsFree online file MD5 checksum tool to calculate file MD5 hash values. Verify file integrity, detect tampering, ensure downloaded files are safe.
Security ToolsFree online file hash calculator supporting MD5, SHA-1, SHA-256, SHA-512 and more. Calculate file hashes in one click, verify file integrity.
Security ToolsFree online strong password generator with customizable length and character types. Create high-security random passwords, prevent brute force attacks, protect accounts.
Security ToolsFree online JWT parser to decode and verify JSON Web Tokens. View Header and Payload content, debug API authentication issues.
Security ToolsFree online JWT generator to create tokens with custom Header and Payload. Support multiple algorithms, generate test JWTs quickly.
Security ToolsFree online color picker tool with HEX, RGB, HSL format conversion. Generate color palettes, get web colors, boost design efficiency.
Design ToolsFree online CSS gradient generator to create linear and radial gradient backgrounds. Visual color adjustment, one-click CSS code copy.
Design ToolsFree online QR code generator supporting text, URL, vCard types. Customize style, color, size, download high-quality images instantly.
Design ToolsFree online screen testing tool to detect dead pixels, bright spots, and backlight bleeding. Multiple solid color tests, contrast tests, evaluate display quality.
Design ToolsFree online regex tester with real-time matching and highlighted results. Support common regex library, help debug and validate regular expressions.
Text ProcessingFree online text comparison tool highlighting differences between two texts. Line-by-line comparison, quickly find added, deleted, modified content.
Text ProcessingFree online word counter with real-time statistics for characters, words, reading time and more. Essential writing assistant tool.
Text ProcessingFree online case converter supporting camelCase, snake_case, kebab-case, CONSTANT and more naming formats. Developer essential, convert variable names instantly.
Text ProcessingFree online Chinese converter for Simplified to Traditional Chinese conversion. Support mainland China, Taiwan, Hong Kong standards, handle regional vocabulary differences.
Text ProcessingFree online string reversal tool with full text, word-by-word, line-by-line modes. Fun text processing for various needs.
Text ProcessingFree online Markdown editor with real-time preview, syntax highlighting & HTML export. Support tables, code blocks, diagrams, write more efficiently.
Text ProcessingFree online teleprompter with smooth auto-scroll, fullscreen mode, mirrored text, and adjustable reading pace for video recording, speeches, and livestreams.
Text ProcessingFree online text deduplication tool supporting line, word, sentence, and paragraph modes. Remove duplicate content with case sensitivity and order options.
Text ProcessingFree online timestamp converter for Unix timestamp to datetime format conversion. Support millisecond and second timestamps, display multiple timezones.
Time ToolsFree online countdown timer to create custom countdowns. Set target time, reminder features, accurate to seconds, suitable for various scenarios.
Time ToolsGaokao countdown timer, real-time calculation of days, hours, minutes, and seconds until China's National College Entrance Examination. Auto-detects exam year, supports 100+ years.
Time ToolsFree online baby days calculator to track days, weeks, and months since birth. Shows growth milestones, cherish every moment with your baby.
Time ToolsFree online due date calculator based on LMP, IVF, or ultrasound data. Shows pregnancy week and progress.
Time ToolsFree online lifespan calculator to visualize your life progress. Calculate percentage of life lived based on birthdate and life expectancy.
Time ToolsFree online sleep calculator. Find optimal sleep and wake times based on 90-minute sleep cycles for better rest.
Time ToolsFree online date calculator for date intervals, date addition/subtraction, age calculation, workday calculation. One-stop date processing solution.
Time ToolsFree online Gregorian to Lunar calendar converter. Query zodiac, solar terms, traditional festivals. Support 1900-2100 range, learn lunar calendar info.
Time ToolsFree online Pomodoro timer for scientific time management. 25 minutes of focused work, 5 minutes of short breaks, boost productivity and build focus habits.
Time ToolsComplete chronological table of Chinese dynasties from Xia to Qing dynasty, with dates, founding emperors, and capital cities.
Time ToolsFree online world clock tool. View current time, date, and weekday for cities worldwide. Search city timezones and see offset from local time.
Time ToolsFree online UUID generator creating RFC 4122 compliant unique identifiers. Support UUID v1, v4 versions, batch generation.
Developer ToolsFree online token counter tool to estimate token count in AI models like GPT and Claude. Helps control prompt costs for API calls.
Dev ToolsFree online HTTP status code reference with all standard codes. Search and filter by category, quickly find 1xx to 5xx status code meanings.
Dev ToolsFree online MIME type lookup tool. Quickly find MIME types for file extensions. Search and filter by category, covering documents, images, audio, video and more.
Dev ToolsFree online Git commands cheat sheet with most commonly used Git commands. Organized by category with search and filter for quick Git command lookup.
Dev ToolsFree online ASCII table reference with control characters, printable characters, and extended characters. Search and filter by category for quick character code lookup.
Dev ToolsFree online Cron expression tool to parse and generate Cron schedule expressions. Visual configuration, support second-level, Quartz extended syntax.
Developer ToolsFree online JSON to TypeScript converter auto-generating interface definitions. Support nested objects, arrays, union types, accelerate TypeScript development.
Developer ToolsFree online microphone test tool with real-time volume waveform and spectrum analysis. Support recording playback, device info detection, browser-based privacy protection.
Developer ToolsFree online camera test tool with real-time preview and photo capture. Support resolution detection, device info viewing, browser-based privacy protection.
Developer ToolsFree online keyboard test tool with real-time key detection and key code display. Virtual keyboard visualization, support key history, browser-based privacy protection.
Developer ToolsFree online mouse test tool to check mouse buttons, scroll wheel, and double-click. Real-time mouse position and click counter, event history support, browser-based privacy protection.
Developer ToolsFree online screen recorder. Record screen, window, or browser tab with optional audio. No software needed, instant video download, browser-based privacy protection.
Developer ToolsFree online ZIP pack & compress tool. Upload multiple files, drag & drop to add, one-click ZIP download. Browser-based local processing, privacy protected.
Developer ToolsFree online ZIP unpack tool. Upload ZIP archives to preview and extract files. Download individually or extract all, browser-based local processing, privacy protected.
Developer ToolsFree online IP address lookup tool. Instantly find your public IP address and geolocation info including country, city, and ISP.
Dev ToolsFree online screen refresh rate test tool. Detect actual monitor refresh rate through animation frame rate, supports 60Hz, 120Hz, 144Hz and higher.
Dev ToolsFree online reaction speed test tool. Test your reaction time from signal to click, track your best score and average, challenge your limits.
Dev ToolsServer-side rendered demo page, demonstrating SSR fetching data from backend API. Ideal for SEO-optimized pages.
Dev ToolsFree online number base converter. Convert between binary, octal, decimal, hexadecimal and custom bases instantly. Copy results with one click. All processing runs in your browser.
Dev ToolsFree online system check tool. Detect your OS, browser, screen resolution, hardware config, and network status. Privacy-first local browser processing.
Developer ToolsFree online scientific calculator with trigonometric functions, logarithms, exponentials, factorials, powers, and degree/radian mode
Developer ToolsFree online decibel meter, measure ambient noise levels in real time with gauge display, noise level classification, and statistics
Developer ToolsFree online scoreboard tool, add multiple players, custom scoring, real-time ranking. Perfect for board games, parties, sports and competitions.
Developer ToolsFree online BMI calculator to calculate Body Mass Index and assess weight health status. Supports metric and imperial units, provides healthy weight range and ideal weight recommendations.
Health ToolsFree online BMR calculator to calculate Basal Metabolic Rate and daily calorie needs. Supports Harris-Benedict, Mifflin-St Jeor, and Katch-McArdle formulas with metric and imperial units.
Health ToolsFree online body fat calculator using US Navy and BMI methods. Calculate body fat percentage from height, weight, and body measurements. Understand your fat mass and lean body mass.
Health ToolsFree online decision wheel tool. Enter multiple options, spin the wheel to randomly select one. Perfect for choosing what to eat, where to go, what to watch. Beat indecision with the wheel!
Dev ToolsFree online random picker tool for raffles and draws. Uses cryptographic random algorithm for fairness, with draw animation and duplicate options.
Text ProcessingFree online JSON Schema generator that creates standard-compliant schema definitions from JSON data. Supports nested objects, array type inference, required field configuration for rapid data validation setup.
Dev ToolsFree online passport photo maker with AI background removal. Supports international standards (US Passport, EU ID, UK Passport, etc.), generates standard passport and ID photos in one click. Browser-local processing protects privacy.
Design ToolsFree online Chinese kinship title calculator. Enter relationship chain to find correct family title based on traditional Chinese culture, distinguishing paternal/maternal lineage and birth order.
Text ProcessingFree online ID card age calculator. Batch parse Chinese ID numbers, calculate ages, view statistics including age distribution, gender ratio. Supports CSV export.
Dev Tools