Developer Tool
JWT Encoder/Decoder
Encode and decode JWTs, inspect claims, and verify HS256/RS256 signatures privately in your browser.
Switch modes
JWT Token
Paste a token in header.payload.signature format
Changelog
v1.2.0Latest
Encode Mode & UX
- • Added HS256 token signing with custom secret
- • Added example payload generator and copy actions
- • Improved error messages and validation feedback
- • UI polish for inputs and results
v1.1.0
Verification & Claims
- • HS256 and RS256 verification with PEM support
- • Added claim checks for exp/nbf/iat with clock skew
- • Exposed header alg with auto-detection
v1.0.0
Initial Release
- • Decode JWT header, payload, and signature
- • Copy decoded sections and clear inputs
- • Example token generation for quick testing
- • Privacy-first: all processing in-browser
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Quick Tips
- All processing happens in your browser
- Your data never leaves your device
- No registration or login required
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