GGetWebTool

Security

JWT Encoder

Create a JWT token from header and payload, with optional signature.

100% client-side · Data never leaves your device · Free forever

Generated JWT

How to use it

  1. Enter header and payload JSON (or use Sample).
  2. Optionally add a signature.
  3. Click Encode JWT and copy the token.

Why use it

  • Build test tokens for auth and API work.
  • Create signed-looking tokens for local debugging.
  • Generate example JWTs for documentation.
  • Runs locally so your data stays private.
  • Free with no account or limits.

How JWT encoding works

A JSON Web Token (JWT) is built from three Base64URL-encoded segments separated by dots:header.payload.signature. The header describes the token type and the signing algorithm, and the payload holds the claims. This encoder composes the three-part structure from the JSON you provide:

  • Header: typically the algorithm (for example alg:none for a test token or HS256 for a signed one).
  • Payload: your claims, such as sub, exp, andiat.
  • Signature: a Base64URL-encoded value; leave it empty for an unsigned (alg: none) token used mainly for local testing.

The result round-trips with this site's JWT Decoder, so you can encode a token and immediately decode it to verify the header and payload.

Frequently asked questions

Can I set any header and payload?

Yes. You can define the header (like the algorithm) and the payload claims (sub, exp, iat, and more) as JSON, then generate the token.

Does the encoder sign the token for me?

It creates the three-part JWT structure. For a real signature you paste a pre-computed signature; unsigored (alg: none) tokens are generated for local testing.

Is the token created locally?

Yes. Encoding runs entirely in your browser, so your secret header and payload never leave your device.