Check security headers

How well does a website protect its visitors? The tool checks HSTS, Content-Security-Policy, X-Frame-Options, other headers and cookies and gives a grade.

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Frequently asked questions

How is the grade calculated?

The starting point is 100 points. Missing or weak headers cost points, most of all a missing Content-Security-Policy and HSTS. The weighting is droppy24's own, not an official standard.

Which headers matter most?

HSTS enforces HTTPS, the Content-Security-Policy makes injected scripts harder, and X-Frame-Options or frame-ancestors prevents the page from being invisibly embedded in other pages.

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