Encoding & Security
JWT Signature Verifier
Verify supported HMAC, RSA, RSA-PSS, and ECDSA JWT signatures with a local key.
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About this tool
Verify a compact JWT signature locally using HS256/384/512, RS256/384/512, PS256/384/512, ES256, or ES384. The selected algorithm must match the token header and alg=none is rejected.
Common uses
- Check an HMAC-signed development token
- Verify RSA or EC tokens with an SPKI public key
- Separate cryptographic signature status from authorization policy