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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 accurately determine the real reason a JWT decoder shows an invalid signature, distinguish the boundary between decoding and signature verification, master how to view the payload during API debugging, use it on mobile, and handle large-token lag, and complete a self-check through a step-by-step process.
How do you convert PDF to images? Put the PDF file into a conversion tool in your browser, choose the output format and resolution, and export page by page as PNG or JPG. The file is never uploaded to a server throughout the process. Below, the complete steps for local browser conversion are explained clearly, including how to set parameters, how to handle blurriness and large-file failures, and how to complete it on a phone. First confirm whether your PDF is a text version or a scanned version.
A URL parameter parser is a tool that automatically splits the query string after the question mark in a URL into key-value pairs. Its difference from manually splitting a query string is that the parser completes decoding, grouping, and structured display in one pass, while manual splitting relies on character-by-character recognition and easily misses encoded characters and duplicate parameters. You can paste a link in your browser and get results without installing any software. The query string refers to the ? in a URL
After reading this article, you will be able to judge whether an online password generator's randomness is reliable, master the correct four-step usage, distinguish it from browser password suggestions, and solve practical problems such as mobile opening failures and batch testing.
This content clearly explains what ROT13 encryption is, its shift principle, and its difference from the Caesar cipher. It provides a three-step manual calculation method you can follow directly, and explains why Chinese does not participate in the conversion, how to use it on mobile, and its reasonable role in API debugging, helping you avoid mistaking it for a secure encryption method.
Once you understand the difference between image resizing tools and image compression, you can decide in one go whether to change dimensions or file size, and complete resizing in the browser with a four-step process, while also learning about large-image limits, mobile operation, and troubleshooting directions when the tool won't open.
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