Crypto
JWT Builder
Edit JWT header/payload, set expiry, and optionally HS256-sign in the browser.
Free online jwt builder — runs entirely in your browser. Nothing is sent to our servers.
Edit claims and encode. Optional HS256 signing stays in your browser — do not use production secrets on shared machines.
Header (JSON)
Payload (JSON)
JWT
Unsigned prefix
About this tool
Use this free browser-based jwt builder when you need a quick crypto utility without installing software. Processing stays on your device for privacy. Related searches: jwt, token, build, claims, hs256.