Tools
Small, free, browser-based utilities for everyday development work. Everything runs locally in your browser -- nothing you type here is uploaded or sent to any server.
Data
JSON Formatter & Validator
Format, validate, and minify JSON with clear error locations.
Text
Regex Tester
Test a regular expression against sample text and see every match.
Text
Text Diff Checker
Compare two blocks of text and see exactly what changed, line by line.
Web
URL Encoder / Decoder
Percent-encode or decode a URL, query string, or component.
Data
Base64 Encoder / Decoder
Convert text to and from Base64.
Data
Timestamp Converter
Convert between a Unix timestamp and a human-readable date and time.
Design
Color Contrast Checker
Check a foreground/background color pair against WCAG contrast ratios.