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Security Header Checker
Grade a website’s security headers (HSTS, CSP, X-Frame-Options…) with fixes.
- Results in seconds
- 100% free, no account
- Plain-English explanations
- Shareable result link
Running the checks…
This usually takes a few seconds.
What this tool checks
- HSTS, Content-Security-Policy and X-Frame-Options
- X-Content-Type-Options, Referrer-Policy and Permissions-Policy
- Headers that leak your server or PHP version
- An overall grade from A+ to F, with the exact fix
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