DevTools24
Your collection of free online developer tools. Convert, encode, decode, generate, and transform data instantly. No installation required – everything runs securely in your browser.
GUID Generator
Generate secure and unique GUIDs for databases, software development, and system identification.
Base64 Encoder/Decoder
Encode and decode Base64 text quickly and easily with copy-to-clipboard functionality.
String Escaper/Unescaper
Escape and unescape strings for HTML, JavaScript, URLs, and more formats.
URL Encoder/Decoder
Encode and decode URL parameters safely for query strings and web development.
JSON Formatter/Validator
Format, minify, and validate JSON with syntax checking and proper indentation for API debugging.
HTML/CSS Minifier
Compress HTML and CSS by removing whitespace and comments for production optimization.
Regex Tester
Test and debug regular expressions with live feedback, match highlighting, and detailed results.
Color Palette Generator
Create harmonious color palettes from any base color using color theory principles for design projects.
Unit Converter
Convert between metric/imperial units, CSS units (px to rem), temperatures, and more measurements.
Password Generator
Create strong, random passwords with customizable options for maximum security.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for data validation and integrity checks.
JWT Token Viewer
Decode and inspect JWT tokens to view headers, payloads, and verify signatures.
MIME Type Converter
Look up MIME types for file extensions and find appropriate file extensions for MIME types.
Date-Time Converter
Convert between timestamps, dates, and various time formats with timezone support.
Color Converter
Convert colors between HEX, RGB, HSL, and other color formats with live preview.
OpenAPI/Swagger Viewer
Paste your OpenAPI or Swagger spec to view endpoints in a clean, organized interface for API documentation.
Diff Viewer
Compare two text or code blocks side by side with visual highlighting of differences, additions, and deletions.
Diff Viewer
Compare two text or code blocks side by side with visual highlighting of differences, additions, and deletions.
Cron Expression Generator
Build and parse cron expressions with visual generator and human-readable descriptions for task scheduling.
All tools are free, secure, and work offline. No data is sent to any server.