Loading
Security
Inspect a JSON Web Key or JWKS document, field by field, without exposing private key material.
Runs entirely in your browser, nothing is uploadedAccepts a single JWK or a JWKS document (an object with a “keys” array). Private-key components are flagged but never displayed in full.
Decode a JSON Web Token’s header and payload, and verify an HS256 signature with a secret.
Open toolRead a PEM/DER X.509 certificate’s subject, issuer, validity, and public key details.
Open toolCompute an HMAC-SHA1/256/384/512 of a message with a secret key.
Open tool