JWT decoder
Decode a three-part JWT to inspect its JSON header and payload locally. This viewer does not verify the token signature.
Features
- Read the header and payload of a three-part JWT.
- Handle Base64url-encoded JSON sections.
- Clearly report that the signature has not been verified.
How to use this tool
- Paste the JWT into the input.
- Run the decoder.
- Inspect the decoded fields and copy or download the JSON.
Good to know
This tool is free without sign-up, with unlimited processing and exports within the displayed input limits.
- Decoded claims are untrusted until verified by the receiving system. This tool does not validate signature, expiry or authorization.
Privacy and local processing
This tool processes your input in your browser. Source files and text are not uploaded to a FormatOwl processing server. Advanced-tool access and trial balances are checked online using tool IDs, file types, sizes and page counts. Free tools do not require account authorization. Save the results you need before leaving or refreshing the page.
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