JWT Crafter

Sign and verify JWTs with HS256/384/512 or RS256/384/512 keys.

Mode Algorithm

Header JSON Payload JSON Key (HMAC secret or RSA PEM private key)

Signed token

About this tool

Build a signed JWT from your own header and payload, or verify an existing token against a key. Supports HMAC (HS256/HS384/HS512) and RSA (RS256/RS384/RS512) — paste PEM-encoded keys for RSA.