Free · Online · No install · Private

JWT Token Decoder

Inspect the header, payload, and claims of any JWT token safely — decoded entirely in your browser, never uploaded.

Try the tool now

Paste a JWT token to decode its header and payload claims.

A JWT is three Base64URL parts separated by dots. Example: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0In0.signature

Header

Not decoded yet.

Payload

Not decoded yet.

Signature

Not decoded yet.

Note: this tool decodes the readable claims. It does not verify the signature.

🔒 Your token is decoded locally in your browser. It is never uploaded or logged.

How to decode a JWT token

  1. Paste your token

    Copy the full JWT and paste it into the input. It has three parts separated by dots.

  2. Decode it

    Click Decode token. The header and payload are decoded into readable JSON instantly.

  3. Copy or download

    Copy the payload or download it as a file. Nothing is stored or sent anywhere.

Why use a browser-based JWT decoder?

  • Private & secure. Tokens are decoded locally in your browser and never leave your device.
  • Readable claims. The header and payload are pretty-printed into JSON you can scan quickly.
  • No install, no sign-up. A free online JWT decoder that runs instantly.
  • Offline ready. Works without an internet connection once loaded.
  • Fast and lightweight. Instant results with a clean, developer-friendly interface.
  • Free forever. No paywalls, no limits, no data caps.

Frequently asked questions

What is a JWT token?

A JSON Web Token (JWT) is an open standard used to securely transmit claims between parties, commonly for authorization. It has three parts: a header, a payload, and a signature.

Does this decoder verify the signature?

No. This free JWT token decoder reads and displays the header and payload claims. Verifying a signature requires the secret or public key, which this tool intentionally does not ask for.

Is decoding a JWT safe?

Yes. Decoding is always safe because it only reverses Base64URL encoding. Your token is processed entirely in your browser and never uploaded.

What do the header and payload contain?

The header usually holds the signing algorithm and token type, while the payload holds claims like the subject (sub), issuer (iss), and expiry (exp) of the token.

Legal: All processing is done locally in your browser. Read our Privacy Policy, Terms of Service, and Cookie Policy.