Free browser utility
JWT Decoder
This tool only decodes token data. It does not verify the signature or prove that the token is trustworthy.
✓ Local processing✓ No registration✓ No file upload
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Before
xxxxx.yyyyy.zzzzz
→
After
Decoded header, payload and timestamp claims
How to use JWT Decoder
- Paste text or select local files in the tool area.
- Choose any options that match the source data.
- Run the conversion or repair and review the preview.
- Copy the result or download the generated file.
Privacy and local processing
This project performs processing, document generation or calculations in your browser. The page does not include an upload endpoint, analytics script or remote processing API call. Avoid pasting sensitive data into websites you do not control.
Frequently asked questions
Does decoding verify a JWT signature?
No. Signature verification requires the correct key and algorithm and is outside this decoder.
Is the token uploaded?
No. Decoding occurs locally and the page has no network connection code.