CORS Tester
Check cross-origin request permissions
Free online CORS tester. Check if a URL allows cross-origin requests with GET, POST, OPTIONS and custom headers.
How to use CORS Tester
- Enter the URL to test.
- Choose a method and add headers.
- Click Test CORS for the verdict.
Features
- GET/POST/OPTIONS/HEAD methods
- Custom Origin and headers
- Instant pass/fail verdict
- Free online tool, no signup needed to view
Frequently asked questions
What does this test?
Whether the target server sends CORS headers allowing your browser origin to read the response.
Why did it fail?
The server likely lacks Access-Control-Allow-Origin for your origin, or the URL is unreachable.
Is it free?
Yes, completely free with no signup required to view the page. Login to use the tool without limits.
Is my data safe?
Yes. Requests go directly from your browser to the target URL — nothing passes through our servers.
Login to use this free online tool. Create a free account to get started.
