JWT Decoder
Decode a JSON Web Token (JWT) online, free. View the header and payload instantly. Client-side only, your token never leaves your browser.
How to use JWT Decoder
- Paste your JSON Web Token (it starts with "eyJ").
- Click "Decode".
- Read the decoded header and payload.
About JWT Decoder
JWT Decoder is a free Becoderr tool. It needs no sign-up, runs fast and privately, and works right in your browser for most tasks. For the few server-based tools, your files are processed in memory and discarded immediately after the operation.
Frequently asked questions
Does this verify the signature?
No, it only decodes the header and payload for inspection. It does not validate the signature or trust the token.
Is my token sent anywhere?
No. Decoding happens entirely in your browser; your token never leaves your device.
Is this tool free to use?
Yes. Every tool on Becoderr is completely free with no sign-up required. Signed-in users get higher file-size limits.
Are my files safe?
Yes. Browser-based tools process files entirely on your device; nothing is uploaded. Server-based tools process files in memory and discard them immediately after the operation.
Is there a file size limit?
Server-based tools accept up to 5 MB for anonymous users and 50 MB when signed in. Browser-based tools are limited only by your device.