100% local · no upload

JWT Decoder

Decode a JSON Web Token to inspect its header, payload, and signature — entirely in your browser. Signatures are NOT verified.

This tool only decodes — it does not verify signatures. Never paste production secrets anywhere.

Token

Paste a JWT above to see its parts.

How it works

Drop your file or paste your content into the tool above.
Adjust the options — every change updates the preview instantly.
Download the result. Your file never leaves your browser.

Your files never leave this page

Every conversion runs entirely in your browser using WebAssembly. There is no upload, no server-side processing, no analytics, and no cookies. Open DevTools → Network during the operation and you will see zero outbound traffic.

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Topics covered

decode jwt online private
jwt decoder no upload
jwt token inspector
inspect jwt claims
json web token decoder
jwt iat exp viewer