Decoding happens entirely in your browser and the token is never uploaded. Still, avoid pasting production tokens that grant live access anywhere you don't control.
Does this verify the JWT signature?
No. It decodes and displays the contents. Signature verification must be done on a server with the secret or public key.
Is JWT Decoder free to use?
Yes. JWT Decoder is completely free with no sign-up, no watermarks and no usage limits.
Is my data uploaded to a server?
No. JWT Decoder runs entirely in your browser, so your data never leaves your device.
Is there a size limit?
Only your device's available memory — there are no server-side limits because nothing is uploaded.