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JWT Decoder

Client-Side Only

Decode and inspect JWT tokens safely in your browser. No data leaves your device.

Token is CLIENT-SIDE ONLY

Your JWT is decoded entirely in this browser tab using atob(). No network requests are made. This tool decodes only — it does NOT verify the signature (that requires your secret key).

Paste JWT Token

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About This Tool

JWT Decoder is a browser-based tool that decodes and inspects JSON Web Tokens (JWT) securely. It's ideal for developers, security professionals, and anyone working with web authentication systems.

Simply paste your JWT token into the input field to decode it. The output displays the header, payload, and signature sections of the token in a readable format.

Use this tool to inspect tokens without compromising privacy or data integrity. It runs entirely within your browser; no data is sent to any server.

Frequently Asked Questions