Tools

JWT Signature Verifier

Verify a JWT with a pasted public JWK, JWKS, or PEM SPKI key using Web Crypto.

JWT inputCompact token
Public keyJWK, JWKS, or PEM SPKI
Verification supports RSA, RSA-PSS, ECDSA, and EdDSA where Web Crypto supports them.

Signature verification does not automatically validate issuer, audience, expiration, nonce, or authorization policy.

Private by design

Nothing is uploaded, logged, or saved. Avoid pasting live secrets into shared screens.