JWT HS256 Verifier

Accept only alg=HS256, compare the local HMAC signature, and separately show decoded claims without network requests.

HS256 JWTShared secret

ReadyOnly alg=HS256 is accepted by this verifier.

JWT contents are untrusted until signature verification and application-specific claim validation succeed. These browser-local tools do not contact an issuer, fetch keys, or validate authorization policy.

How to use this JWT HS256 Verifier

Verify an HS256 JWT signature locally with an explicit shared secret. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.