JWT Encoder & Decoder

Secure local processing. Tokens never leave your browser.

Waiting for valid token...
Waiting for valid token...

How to use JWT Encoder & Decoder

A blazing fast, free, and secure online JWT Encoder and Decoder. Parse JSON Web Tokens or generate new HS256 signatures instantly in your browser.

  1. 1

    Choose Mode

    Toggle between Decoder mode to parse existing tokens, or Encoder mode to generate new ones.

  2. 2

    Input Data

    Paste your JWT string, or input your JSON Header and Payload.

  3. 3

    Instant Results

    The token is decoded or encoded instantly using native browser crypto APIs. Your secrets and tokens never leave your device.

FAQ

Everything you need to know.

Is this tool secure?

Yes! 100% of the JWT decoding and encoding (including HS256 cryptographic signing) happens strictly inside your local web browser. We never send your secrets or payloads to any server.

Why is the JWT color coded?

We colorize the token to help you understand its structure. Orange is the Base64Url encoded Header, Purple is the encoded Payload, and Blue is the cryptographic Signature.