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JWT Decoder Online Free

Decode JSON Web Tokens online. View JWT header, payload, and signature.

Files never uploadedInstant results100% freeWorks on mobile

How to Use

  1. 1Paste your JWT token into the text area below.
  2. 2Click the "Decode" button to parse the token.
  3. 3View the decoded header, payload, and signature with copy buttons.

Frequently Asked Questions

What is a JWT token?

JWT (JSON Web Token) is a compact, URL-safe means of representing claims between two parties. It consists of three parts: header, payload, and signature, all base64url-encoded and separated by dots.

Can this tool verify or validate a JWT?

No. This tool only decodes the token for inspection. It does not verify the cryptographic signature or validate claims like expiration. For verification, use a JWT library with the original secret or public key.

Is my token data sent to a server?

No. All decoding happens entirely in your browser using the native atob() function. Your JWT token never leaves your device.

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