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CORS Headers Builder
Build a static CORS response or preflight header set.
Entered origin and policy fields
cors-headers.txt, cors-policy-report.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Enter the shown fields and choose the stated mode or options.
- Build CORS fields and inspect the complete result.
- Download cors-headers.txt, cors-policy-report.json.
Examples
A credentialed origin can explicitly allow GET and Authorization without a wildcard.
Limitations
- Static syntax only; browser behavior, server middleware and deployment security are not certified.
- Wildcard origin with credentials refuses. Wildcards in selected method or header-name lists refuse.
- Up to 20 unique methods and 100 header names; max-age is locally bounded to 86,400 seconds. Only fields selected by the chosen mode affect the result.
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