Developer Tools
Explore related tools you may want to use together with CORS Header Checker or instead of it, depending on your task.
Use this CORS Header Checker to fetch a URL and inspect common CORS response headers such as Access-Control-Allow-Origin, Access-Control-Allow-Methods, Access-Control-Allow-Headers, Access-Control-Allow-Credentials, and Vary. It is useful for debugging browser requests, API integrations, frontend issues, and basic cross-origin configuration checks.
Related pages are useful when CORS Header Checker is only one step in a bigger workflow. Sometimes you need a reverse action, a cleanup step, a validator, a supporting converter, or a nearby tool in the same category.
Return to the main CORS Header Checker page to run the tool directly.