JWT Decoder
Decode JWT tokens online and inspect the header, payload, and signature instantly. Free JWT decoder for debugging auth — no data ever sent anywhere.
Signature is shown truncated and is not verified here. Verify with JWT Validator.
{ "header": { "alg": "HS256", "typ": "JWT" }, "payload": { "sub": "1234567890", "name": "John Doe", "iat": 1516239022 }, "signature": "SflKxwRJSMeKKF2Q… (not verified)" }
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Frequently asked questions
What is JWT Decoder?+
Decode and inspect JWT tokens instantly — entirely in your browser.
How do I use JWT Decoder?+
Reveals the header algorithm, payload claims, and raw signature. Useful for debugging auth issues, checking expiry (exp), and reading claims. Signature is NOT verified — this tool only decodes, it does not validate. Nothing is sent to a server — your tokens stay private
Is JWT Decoder free?+
Yes, JWT Decoder is completely free. No account or sign-up required, and all processing happens in your browser — nothing is sent to a server.
Is my data safe when I use JWT Decoder?+
Yes. JWT Decoder runs entirely in your browser using JavaScript and Web APIs — your input is never uploaded, transmitted, or stored on any server.