🔏JWT Encoder

Create and sign JWT tokens (HS256)

Algorithm

Payload (JSON)

Secret

Signed JWT

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Want a deeper walkthrough? Read our complete guide to JWT Encoder →

About the JWT Encoder

JWT Encoder creates and signs JSON Web Tokens using HMAC (HS256/384/512) with a secret you provide — the natural companion to the JWT decoder.

It is useful for testing authentication flows. Signing happens locally so your secret never leaves your device.

Common use cases

Generating test tokens for an API
Experimenting with custom claims
Reproducing tokens while debugging auth
Learning how JWT signing works

How to use the JWT Encoder

Pick the algorithm (HS256, HS384 or HS512).
Edit the payload JSON and enter your secret.
Copy the signed token.

Frequently asked questions

Which algorithms are supported?

HMAC-based HS256, HS384, and HS512 signing.

Is my secret safe?

Yes, the token is signed locally in your browser and the secret is never transmitted.

Can it create RS256 (RSA) tokens?

This tool focuses on HMAC algorithms; RSA signing requires a private key and is best done server-side.