Utilo
Free developer tools that run in your browser
Free online tools. Fast, private, no signup. Format JSON, decode JWTs, test regex, and more — no signup, no upload.
All tools
- JSON Formatter
Format, minify, and validate JSON instantly in your browser. Nothing is uploaded.
- JWT Decoder
Decode JWT header and payload locally. Useful for debugging auth tokens.
- Cron Explainer
Paste a cron expression and get a plain-English schedule explanation.
- Timestamp
Convert Unix timestamps to dates and dates to timestamps in UTC and local time.
- Regex Tester
Test regular expressions against sample text with live match highlighting.
- Base64
Encode text to Base64 or decode Base64 back to text in the browser.
- Hash Generator
Generate SHA-1, SHA-256, and SHA-512 hashes from text using Web Crypto.
- UUID Generator
Generate UUID v4 values instantly. Copy one or a batch.