Free Online JWT Decoder

Decode and inspect JSON Web Tokens (JWT) headers, payloads, and claims locally in your browser.

Security Notice: This tool decodes JWT data but does not verify the token signature. All decoding is processed locally in your browser and is never sent to a server.
Header: Algorithm & Token Type
Header JSON will appear here...
Payload: Data Claims
Payload JSON will appear here...
Client-Side Guarantee: This tool decodes JWT data but does not verify the token signature. No tokens are ever sent to a server.

How to Use the JWT Decoder

  1. Paste your encoded JWT into the token input box.
  2. The tool automatically decodes the Header and Payload into formatted JSON.
  3. Check expiration claims (`exp`) translated into your local timezone.
  4. Copy the decoded payload claims with one click.

Key Features

✓ Separates and color-codes Header, Payload, and Signature components
✓ Parses UNIX timestamps for `exp`, `nbf`, and `iat` into human-readable dates
✓ Identifies expired tokens with clear status indicators
✓ Explicit security note: decodes token payload without requiring server secrets
✓ Zero network requests guarantee absolute token confidentiality

About JWT Decoder

Decode and inspect JSON Web Tokens (JWT) headers and payload claims instantly. All parsing occurs strictly inside your browser so your access tokens and user claims remain private.

Frequently Asked Questions

Is my JWT token sent over the internet?

No. The JWT is decoded using client-side Base64URL parsing. No network request is made.

Does this tool verify the signature of the JWT?

No. This tool decodes JWT data but does not verify the token signature, which requires private or public keys that we purposefully do not request.

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