CORS Tester
Check if a URL supports Cross-Origin Resource Sharing (CORS) and analyze response headers.
security tool
Free online
Check if a URL supports Cross-Origin Resource Sharing (CORS) and analyze response headers.
This page loads the full interactive CORS Tester experience inside Tool Labz. Use it instantly in your browser with no signup and no download.
Repeated identical requests are throttled to reduce accidental API abuse.
HTTP Status
-
CORS Headers
Response Body (Truncated)
Preflight
Browser sends OPTIONS request before actual request if certain conditions are met.
Origin
Headers like Access-Control-Allow-Origin control which domains can access resources.
Credentials
By default, browser doesnt send cookies on cross-origin requests unless allowed.