JWT Generator & Signer

A free client-side JSON Web Token (JWT) generator and signer. Customize JWT Header and Payload JSON fields, select HMAC algorithms (HS256, HS384, HS512), and sign with custom secret keys in real time. Runs 100% locally in your browser using standard JavaScript, ensuring your secret keys never leave your machine.

JWT Generator & Signer: Compose and sign JSON Web Tokens locally in your browser. Select an HMAC hash algorithm, modify the Header and Payload schemas, and provide a secret signature key. Calculations utilize the native SubtleCrypto API so your secret keys never travel across the network.

Token Settings

Signature Algorithm (HMAC)

Secret Key (HMAC String)

Header JSON

Payload claims JSON

Compiled JSON Web Token

Encoded Token String

Waiting for valid configuration...

Color Key Reference:

Header (Red)

Payload (Purple)

Signature (Blue)

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