JWT Decoder

Free online JWT decoder to decode JWT header and payload locally in your browser.

  • Runs locally in your browser
  • No data uploaded
  • Instant processing
Waiting for input

How to Use JWT Decoder

  1. Paste your JWT token into the input area.
  2. The tool decodes header and payload JSON immediately.
  3. Review claims safely without sending token to a server.

Example Usage

Input

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjMifQ.signature

Output

Header:
{
  "alg": "HS256",
  "typ": "JWT"
}

Payload:
{
  "sub": "123"
}

Frequently Asked Questions

Does this JWT decoder verify signatures?
No. It only decodes token parts and does not verify cryptographic signatures.
Is token data sent anywhere?
No. JWT decoding is done locally in your browser.
Can it decode malformed tokens?
Malformed tokens return an error message.