Developer tools that run in your browser
Explain cron schedules, test regular expressions, decode JWTs, convert timestamps and compare text. Everything runs locally: nothing you paste is uploaded.
All tools
Pick a tool and use it right away.
- Unix Timestamp Converter
Convert epoch time to a date and a date to epoch time. Seconds and milliseconds are detected automatically.
Open → - URL Encoder and Decoder
Percent-encode text for URLs or decode it back.
Open → - JWT Decoder
Paste a JSON Web Token to read its header and payload. Decoding happens in your browser.
Open → - Cron Expression Explainer
Translate a cron schedule into plain English and see when it will run next.
Open → - Regex Tester
Write a JavaScript regular expression and see matches highlighted as you type.
Open → - Text Diff Checker
Paste two versions of a text and see what changed, line by line.
Open → - Hash Generator
Type text to get its SHA hashes instantly. Computed locally with the Web Crypto API.
Open → - Lorem Ipsum Generator
Generate placeholder text for layouts and mockups.
Open → - Color Contrast Checker
Enter a text and a background color to check WCAG contrast.
Open → - Number Base Converter
Convert integers between binary, octal, decimal and hexadecimal.
Open →