Security Headers Checker
Grade HTTP security headers with a live server-side GET request
About this tool
Live GET request grades HSTS, CSP, X-Frame-Options and more. Actionable A–F score. Free, no signup. Security Headers Checker runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- Security Headers Checker is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use Security Headers Checker?
Open Security Headers Checker, enter or paste your input, and copy the result. The page works without an account.
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