Not supported here. Only symmetric HS256.

Add it in payload JSON yourself; this tool does not set defaults.

Include any fields you need in the header JSON.

Use your stack’s JWT library; this tool only signs.

JWT Encode Online – Sign HS256 JWT with Web Crypto

Generate HS256 JWTs to compare with server libraries or teach how compact signatures work. Keep production secrets off shared machines.

Secret

Header (JSON)

Payload (JSON)

JWT

Related tools

Header and payload are Base64url-encoded, concatenated, and signed with HMAC-SHA256.

The signature is Base64url-encoded and appended as the third segment.

Issue tokens on the server with audited libraries; this page is for learning and debugging.

Typing a production secret in a web page is risky. Prefer dev keys only.

RS256?: Not supported here. Only symmetric HS256.
exp claim?: Add it in payload JSON yourself; this tool does not set defaults.
kid header?: Include any fields you need in the header JSON.
Verification?: Use your stack’s JWT library; this tool only signs.