JWT Decoder
Decode a JSON Web Token to read its header and payload. The signature is not verified — inspect, do not trust. Free.
Scan to open on your phone
Point your phone camera at the code to open this tool.
Decode a JSON Web Token to read its header and payload. The signature is not verified — inspect, do not trust. Free.
How to use JWT Decoder
- Paste or type your contentThe result appears as you type — there is no submit button.
- Read and copy the resultThe output updates live and the copy button takes it in one click.
Worked example
- eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyIjoiYWRhIn0.abc
- Header: { "alg": "HS256" } Payload: { "user": "ada" }
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
JWT Decoder only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- Is the signature verified?
- No. This only decodes the payload so you can read it; it does not prove the token is valid.
- Is my token uploaded?
- No. Decoding runs entirely in your browser, so the token stays on your device.