JWT Generator
Sign JSON Web Tokens with HS256, HS384, or HS512. Uses the Web Crypto API — your secret and payload never leave the browser.
// Signed JWT will appear here…
JWT Generator (Signer)
Sign JSON Web Tokens with symmetric HMAC algorithms (HS256, HS384, HS512) using the Web Crypto API. Perfect for testing auth flows, generating fixture tokens, or decoding + resigning a token with new claims.
FAQ
Why not RS256 or ES256?
Asymmetric algorithms need a private key import — not a text secret. For HS* algorithms a secret string is enough, which is what this tool handles.
Is my secret sent anywhere?
No. HMAC signing is done locally with the browser's Web Crypto API.
Related
Decode a JWT with the JWT Decoder; learn more in Understanding JWT.
HS256/384/512
Symmetric HMAC algorithms via native Web Crypto.
Fully private
Secrets stay in your browser — never logged or sent.
Instant
Signing happens in milliseconds in your browser.