Developer Tools Tools
JSON, regex, encoding, hashing, and other browser-only tools for developers. 8 free tools, no sign-up required.
JSON Formatter & Validator
Pretty-print or minify JSON, and catch syntax errors with line and column numbers.
Regex Tester
Test a regular expression against sample text with live match highlighting and a capture group breakdown.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to text, live, with full Unicode support and an optional URL-safe variant.
UUID Generator
Generate cryptographically random v4 UUIDs, one at a time or in bulk, with uppercase, no-hyphens, and braces formatting options.
Cron Expression Explainer
Paste a standard 5-field cron expression and get a plain-English explanation of when it runs.
Unix Timestamp Converter
Convert a Unix timestamp (epoch time) to a human-readable date and back, live, in both your local time zone and UTC.
Hash Generator
Generate the MD5 and SHA-256 hash of any text, live, entirely in your browser.
Color Contrast Checker
Check the WCAG contrast ratio between a text color and a background color, with pass/fail results for AA and AAA accessibility levels.