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.

Features

Decodes the header and payload and renders the raw signature, all in your browser.
The token is decoded entirely on your device and never sent to a server.
Inspects standard claims and flags expired or not-yet-valid tokens without verifying the signature.

How it works

Paste a JWT in the header.payload.signature form into the token box.
Read the decoded header and payload, with iat, exp and nbf shown as readable dates.
Check the status badge — Valid, Expired or Not yet valid — and copy any part you need.

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