Free JWT Decoder Online
Decode JSON Web Tokens (JWT) to view header and payload. Free, fast, and works entirely in your browser with no sign-up required.
JWT Decoder & Builder
Decode, inspect, validate, and build JSON Web Tokens with full claim explanations, expiry tracking, and multi-language code snippets.
Paste JWT Token
Paste a JWT above to decode and inspect it
What is a JWT? A JSON Web Token (RFC 7519) is a compact, URL-safe token with three parts: a header (algorithm + type), a payload (claims), and a signature. The header and payload are base64url-encoded JSON — not encrypted.
Client-side decoding only. This tool decodes tokens entirely in your browser. Signature verification requires your secret key and should only happen server-side. Treat any JWT containing real credentials with care.
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Frequently Asked Questions
What is the JWT Decoder?
The JWT Decoder is a free online tool that decodes JSON Web Tokens to display the header, payload, and signature information in a readable format.
Is the JWT Decoder free and secure?
Yes, it is completely free with no registration required. All decoding happens client-side in your browser, so your tokens are never sent to any server.
What information does it show?
The JWT Decoder displays the algorithm, token type, expiration time, issuer, subject, and all custom claims stored in the JWT payload.
Is my data safe with this tool?
Absolutely. The JWT Decoder processes everything client-side in your browser. No data is uploaded to or stored on any server. Your content remains private on your device at all times.
Does the JWT Decoder work on mobile devices?
Yes, the JWT Decoder is fully responsive and works on smartphones and tablets. You can use it on any device with a modern web browser -- no app download required.
Do I need to create an account to use this tool?
No account or registration is needed. Simply open the JWT Decoder in your browser and start using it immediately. There are no sign-up walls or usage restrictions.
How do I use the JWT Decoder?
Simply enter your input in the provided field, adjust any settings to your preference, and the tool will process it instantly. You can then copy the result to your clipboard or download it.
Which browsers are supported?
The JWT Decoder works in all modern browsers including Chrome, Firefox, Safari, Edge, and Opera. For the best experience, use the latest version of your preferred browser.
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About Free JWT Decoder Online
Free JWT Decoder Online is a free, browser-based tool in our Utility Tools collection. Everything runs locally on your device — no uploads, no sign-up, and your data stays private.