JWT Decoder without the upload.

Paste a JSON Web Token. See its header, payload, and signature — decoded entirely in your browser. No cookies, no tracking, no upload to anyone's server.

Verify it yourself: open DevTools Network tab, clear it, paste any JWT below. Zero network activity will fire. The decode happens in this tab, full stop.

Paste your JWT

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Paste a JWT above to decode it. Or tap Load example to see the tool in action.