JWT Decoder
Inspect the header and payload sections of a compact JWT without sending the token to a server.
Decode a compact JWT to inspect its JSON header and payload. The token is processed locally and is not sent anywhere.
Decoding does not verify the signature, issuer, audience, or expiry. Never trust a token based only on this display.
🔒 All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
How it works
- Paste a compact JWT with three dot-separated segments.
- Select Decode JWT.
- Review the JSON header, payload, and encoded signature.
Good to know: Decoding does not verify signatures, issuer, audience, or expiry. Treat all displayed claims as untrusted until validated by your application.
Privacy and processing
All processing happens in your browser — files never leave your device. Your input stays in this browser and is not uploaded to Smart Online Tools.
Frequently asked questions
What does JWT Decoder do?
Decode a JSON Web Token header and payload for inspection. Inspect the header and payload sections of a compact JWT without sending the token to a server.
Does this tool upload my files or input?
Your input stays in this browser and is not uploaded to Smart Online Tools.
What should I know before using this tool?
Decoding does not verify signatures, issuer, audience, or expiry. Treat all displayed claims as untrusted until validated by your application.