Private, browser-local utility
CORS Header Generator
Generate bounded Access-Control response headers without contacting or testing a remote server.
Your input and result stay in this browser tab. Nothing is uploaded, fetched, logged, or stored.
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Result
Bounded CORS policy
Supports wildcard or one validated HTTP(S) origin, seven standard methods, token-validated allow/expose header names, credentials, and preflight max age through 86,400 seconds. Wildcard plus credentials is blocked. An explicit origin may contain a scheme, host, and optional port only. This page performs no remote request, endpoint test, proxy, bypass, or server modification.