JWT Decoder

Decode JSON Web Tokens instantly — 100% private, runs in your browser

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About This Tool

Decode JWT tokens instantly in your browser to inspect the header, payload, and signature. This tool is essential for developers debugging authentication issues or validating token structure. Your tokens are decoded locally — they never leave your device.

How to Use

  1. Enter your JWT token into the Paste JWT Token field.
  2. Press the Decode JWT button or use Ctrl+Enter to decode the token.
  3. Inspect the decoded header, payload, and signature panels.
  4. Review the token claims and algorithm details displayed in the output.

Why Choose OmniTools?

⚡ Instant Results

Zero server lag. All calculations run locally on your device for maximum speed.

🛡️ 100% Private

Your data never leaves your device. No uploads, no servers, no tracking.

Frequently Asked Questions

Does it verify the signature?

No. This tool decodes the token but does not verify cryptographic signatures.

Is it safe to paste tokens here?

Yes. Your token is decoded entirely in your browser and is never sent to any server.

Which algorithm is shown?

The alg claim from the JWT header is displayed.

Is there an expiry warning?

Yes. The tool shows whether the token has expired based on the exp claim.

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