Free online tools for everyone — Text processing, image editing, AI writing, format conversion All tools work right in your browser, no installation needed
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Most used tools in the community
Calculate tip, total and per-person share with custom tip rate and party size.
Convert between KB, MB, GB, TB and more. Supports decimal and binary standards.
Visually generate CSS border-radius with independent corner control and copy code.
Calculate trip fuel cost from distance, consumption and fuel price.
Real-time password strength analysis with security score and tips. 100% local, never uploaded.
Merge multiple PDF files into one document online, free and watermark-free
Remove Chinese and English punctuation from text
Calculate daily calorie needs from weight, height, age and activity level.
Curated online tools, organized by category for easy discovery
Online Lorem Ipsum placeholder text generator, supports custom paragraph count, word count, and sentence count, suitable for design drafts and layout placeholders.
Online text deduplication and sorting tool, supporting operations such as line-based deduplication, ascending/descending sorting, random shuffling, and removing empty lines.
Convert titles to URL-friendly slugs
An online text counting tool that supports real-time statistics for Chinese and English, character count, word count, line count, and paragraph count. It is completely free and requires no registration.
Online Markdown editor with real-time preview, supports syntax highlighting, tables, code blocks, etc., and one-click export to HTML/MD format.
Convert plain text into HTML paragraphs with automatic escaping of special characters.
Check if text reads the same forwards and backwards. Ignore spaces and case options.
Remove line breaks from text, optionally keep paragraph breaks
An online text diff checker that supports line-by-line comparison of two texts, highlighting additions, deletions, and modifications. Suitable for code review, document version comparison, and more.
Build a table visually or paste from a spreadsheet, then copy the Markdown
Analyze word frequency in text, supports Chinese and English
Sort text lines alphabetically, by length, or randomly
Merge multiple PDF files into one document online, free and watermark-free
Merge multiple images into a PDF file (local processing)
Compress the size of PDF files online, reducing volume while maintaining quality
Online PDF text extraction tool. Upload a PDF to extract its text content, with support for copying or downloading as a TXT file.
Online PDF page rotation tool, allows rotating a single page or batch rotating all pages, supporting 90°/180°/270° rotation angles.
Quickly generate QR codes, supporting URLs, text, WiFi configurations, etc., with customizable colors and sizes
Delete unwanted pages from a PDF and download the result, all in your browser
Convert PDF pages to PNG images (local processing)
Online image watermarking tool, supports text watermark and image watermark, customizable position, transparency, size, rotation angle, etc.
Online image rotation and flipping tool, supporting 90°/180°/270° rotation and horizontal/vertical mirror flip, with real-time preview.
Online image compression tool, supports JPG, PNG, WebP formats, intelligent compression maintains clarity
Convert images to Base64 encoded strings
Generate Code128 barcodes online with custom size and color. Live preview and PNG download.
View image dimensions, format, file size and more
Generate website favicon from text or letters
Visual CSS gradient generator for linear and radial gradients
Online image cropping tool, supports free cropping, fixed ratio cropping (1:1/4:3/16:9), real-time preview, and one-click download of the cropped result.
Check foreground/background contrast against WCAG standards with AA/AAA rating.
Resize images online with custom dimensions
Decode QR codes from images or camera locally. Privacy-friendly, no upload to server.
View ASCII table in decimal and hexadecimal
Real-time password strength analysis with security score and tips. 100% local, never uploaded.
Visually generate CSS box-shadow with offset, blur, spread, color and inset. Copy code.
ROT13 is a symmetric letter-substitution cipher for simple encoding and decoding.
Visually generate CSS border-radius with independent corner control and copy code.
Online Unix timestamp and date conversion tool, supporting second/millisecond timestamps, displaying multi-timezone time and relative time.
Beautify, minify and convert SQL keyword case with syntax highlighting.
Generate complementary, analogous, and triadic color palettes
An online hash value generation tool that supports algorithms such as MD5, SHA1, SHA256, SHA512, and can generate hash values for strings or files.
Online color picker, supports conversion between HEX, RGB, HSL formats
Base64 encoding and decoding tool, supporting strings and files
Look up HTTP status codes and their meanings
AI intelligent writing, supports copy generation, article continuation, title creation, and SEO optimization suggestions
AI-driven SEO content generation tool, automatically generates optimized articles
Online text to speech tool, supporting multiple voices and speed adjustments
Convert text to Morse code and back. Supports letters, numbers and common punctuation with custom separators.
Decode binary code back to readable text with UTF-8 support. Real-time decoding, the reverse of text to binary.
Convert numbers to Chinese uppercase currency
Convert between Arabic and Roman numerals
Convert between major world currencies with customizable exchange rates.
Convert text to binary code with UTF-8 support. Real-time conversion, perfect for learning encoding and debugging.
Convert XML data to JSON format
Decode hexadecimal code to readable text with UTF-8 support. Real-time decoding for debugging and analysis.
Convert Markdown to HTML in real time with preview, copy and download.
Convert HTML to Markdown format
Online unit converter supporting precise conversions for length, weight, temperature, currency, and more. Simple and easy-to-use interface, ideal for daily work and study.
Online CSV to JSON converter tool, supports custom delimiters, header recognition, one-click conversion and file download.
Convert between pace and finish time, with per-kilometre splits
Roll multiple dice with custom faces online. Fair random results for games and draws.
Pomodoro technique timer with 25-min focus and 5-min break cycles. Customizable.
Randomly split a list of names into teams with custom group size or count.
Calculate daily calorie needs from weight, height, age and activity level.
Calculate tip, total and per-person share with custom tip rate and party size.
Count business days between two dates, excluding weekends and custom dates
Calculate days, weeks, months and years between two dates. Supports any date range.
Calculate discounted price and savings. Supports percentage and amount-off modes in real time.
Calculate monthly payments for equal principal and interest
Online stopwatch with start, pause, lap and reset. Millisecond precision.
Online random number generation tool, supports generating integers or decimals within a specified range, and can batch generate non-repeating random number sequences.
Fast, secure, and completely free online tools
No download or installation needed, just open your browser
Data processed locally, never uploaded to servers
Smart AI tools for more efficient creation
Tips, tutorials and updates
After reading this article, you will be able to distinguish which steps QR code recognition and scan-to-pay are each responsible for, master the four-step usage of online recognition tools, the differences between mobile and computer, five categories of failure causes and troubleshooting order, and get a checklist for checking incorrect results during API debugging.
After mastering the applicable boundaries of URL encoding and HTML entity encoding, you can accurately determine which conversion method a string should use, and complete encoding, decoding, and garbled-text troubleshooting step by step, avoiding broken links and damaged page structure.
This article helps you clarify the difference between PDF compression and resolution reduction, master the handling order for scenarios such as files becoming larger after compression, encryption errors, and mobile installation-free use, and balance clarity and size.
This article helps you identify the real bottlenecks behind lag when formatting large XML files, provides step-by-step optimization actions, and clearly explains formatting meaning, garbled Chinese text, differences from JSON, mobile usage, and API debugging scenarios in one go. After reading, you can decide whether to split files, switch modes, or switch tools.
Handle PDF compression errors in the order of "determine the cause—troubleshoot step by step—select parameters," and master the key points of post-compression size increase, online vs. desktop differences, mobile installation-free use, beginner settings, and scanned file processing to reduce ineffective retries.
Master the three verification methods—discount stacking order, calculation base, and rounding rules—and you can quickly locate the reason why the price calculated by the discount calculator is wrong and correctly calculate the discounted price.
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