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Decode JWT tokens and inspect header, payload, and signature locally.
🔒 100% client-side — your token is parsed in your browser only and never sent to any server. This tool decodes tokens; it cannot verify the signature without the matching secret or public key.
A JSON Web Token (JWT)is a compact, URL-safe string used to securely pass claims between a client and a server — most often for authentication. A JWT has three Base64URL-encoded parts separated by dots: header.payload.signature. This decoder splits those three parts and shows the header and payload as readable JSON, plus the raw signature.
sub), when it was issued (iat), when it expires (exp), and any custom fields your app added.Yes. Decoding runs entirely in your browser with the built-in atobfunction — your token is never uploaded to a server, stored, or logged. That said, treat real access tokens like passwords: do not share them in screenshots, chat, or public repos. If you only want to understand a token's structure, use the Load Sample button for a harmless example.
The JWT Decoder handles jwt decoderdirectly in your browser. Paste or type your input, and the tool processes it instantly — no upload, no signup, no waiting. It's built for the moments when you need a quick transformation and don't want to leave your workflow.
Because the tool runs client-side, it's fast and private. Your text never touches a server, which makes it safe for sensitive content. The interface is keyboard-friendly and works on any device with a modern browser.
Common uses: people reach for this tool when they need to use a jwt decoder base64 url, decode jwt payload online, inspect jwt expiration claim, or jwt token viewer no upload.
Browser-based tools like this one have a few real advantages over installed software or manual methods:
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