JWT Builder — Craft unsigned demo JWTs

Static tool · no accounts · no uploads leave this tab unless you choose to

Demo / unsigned only — not a secure signer This desk builds local demo tokens (alg: none or a labeled empty signature). It does not verify signatures and does not forge HMAC/RSA tokens for production auth.

Header JSON

Payload JSON

Load from JWT (paste token → fill editors)

Decodes segments only — does not verify signatures. Rebuild stays unsigned/demo.

Output mode

JWT output

Open in JWT Decoder