JWT HS256 Generator

Generate a compact HS256 JWS/JWT with Web Crypto using a secret that never leaves the browser.

Header JSON

Payload JSON

Shared secret

ReadyThe header alg is forced to HS256. Do not paste production secrets on devices you do not trust.

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 Generator

Create an HMAC-SHA-256 signed JWT locally from JSON header and payload objects. 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.