How do I create a JWT token?

Enter your header JSON, payload JSON, and a secret key. Select the algorithm (HS256, HS384, or HS512) and the signed JWT is generated instantly. Each part is color-coded so you can see the header, payload, and signature.

Is it safe to use this JWT encoder?

Yes. Signing uses the browser's built-in Web Crypto API — your secret and payload never leave your device. This tool is intended for development and testing; avoid using sensitive production secrets in any browser tool.

Is the JWT encoder free?

Yes, completely free. JWT signing runs entirely in your browser using the Web Crypto API — no data is sent to any server, and no signup is required.

JWT Encoder

Create and sign JSON Web Tokens (JWT) instantly online. Supports HS256, HS384, and HS512 algorithms. Uses the Web Crypto API — your secret never leaves your browser.

Algorithm

Header✓ valid

Payload✓ valid

Add to payload:

Secret

Signed JWT

Fill in header, payload, and secret above…

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How to Use the JWT Encoder

Edit the header and payload JSON as needed.
Enter your secret key and choose an algorithm (HS256, HS384, or HS512).
The signed JWT is generated instantly below, with color-coded parts.
Click "Copy Token" to copy it to your clipboard.

Signing uses the browser's Web Crypto API — your secret never leaves your device. Intended for development and testing only.