Developer Tools
Format, decode, generate and test — JSON, Base64, UUIDs, regex, JWTs and more, right in your browser.
JSON Formatter & Validator
Format, minify and validate JSON instantly — with exact error positions when something's wrong.
Open toolNewBase64 Encode / Decode
Convert text to Base64 and back — UTF-8 safe, so emoji and non-English characters survive.
Open toolNewURL Encoder / Decoder
Percent-encode text for URLs or decode %20-riddled strings back into readable text — live.
Open toolNewUUID Generator
Generate cryptographically secure UUID v4 identifiers — one at a time or 100 in bulk.
Open toolNewRegex Tester
Test regular expressions live — matches highlighted in your text, capture groups listed below.
Open toolNewJWT Decoder
Decode JWT header and payload instantly — with human-readable expiry dates. Nothing leaves your browser.
Open toolNewMarkdown Preview
Write Markdown on the left, see rendered output on the right — live, side by side.
Open toolNewDiff Checker
Compare two texts and see every added and removed line highlighted — like git diff, in your browser.
Open tool