FREE · DEVELOPER TOOLS
JWT Decoder.
Read a JWT header and payload without contacting a server.
How to use JWT Decoder
Enter or choose the required input, adjust the settings, then generate and review the result. Inspect the alg claim and any exp timestamp.
How it works
Read a JWT header and payload without contacting a server. 200,000 characters. Signatures are not verified; decoding does not establish trust. Inputs stay on your device. Review the preview or output before using it; refresh the page to clear the current working session.
Example
Inspect the alg claim and any exp timestamp.
Questions about JWT Decoder
Is JWT Decoder free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
200,000 characters. Signatures are not verified; decoding does not establish trust. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.