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CORS Tester

Test your API CORS headers and validate cross-origin request policies.

How it works: This tool sends a real CORS preflight (OPTIONS) and then a GET request from your browser to the target URL and inspects the returned headers.
Run a test to see CORS headers

🔒 Privacy Note

This tool runs entirely in your browser using JavaScript. Your data is processed locally and never sent to our servers. Processing large files depends on your device's memory.

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