JWT Decoder

Decode JSON Web Tokens instantly and securely — entirely in your browser.

No Data Stored
100% Client-Side
Free Forever
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JWT Decoder

Decode JSON Web Tokens instantly.

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Why use our JWT Decoder?

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Decode Instantly

Instantly parse and decode the Header and Payload of your JSON Web Token.

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Fully Private

All decoding happens in your browser. Your token is never sent to any server, keeping your credentials secure.

Works Instantly

No login, no upload, no waiting. Paste your JWT and get the decoded JSON output right away.

What is a JSON Web Token?

A JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. The token is composed of three Base64Url encoded parts: a Header, a Payload, and a Signature.

How to Decode a JWT

Paste your full JWT string into the input box. The tool will instantly decode the Base64Url strings and display the readable JSON objects for the Header and Payload sections.

Frequently Asked Questions

Is it safe to decode my JWT here?

Yes. The decoding happens entirely in your browser using JavaScript. No data is transmitted to our servers.

Can this tool verify a JWT signature?

This tool decodes the Header and Payload. Signature verification requires your secret key, which should never be pasted online.

What is a JSON Web Token (JWT)?

A JWT is a secure way to transmit information between parties as a JSON object, commonly used for authentication.

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