HTTP Security Headers Checker

Enter any public URL — we'll fetch the response server-side, parse the security headers, and grade the configuration A+ to F with prioritized recommendations.

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What Are HTTP Security Headers?

HTTP security headers are response headers your web server sends to instruct the browser how to behave when handling your site's content. They're a free, high-leverage layer of defense: a properly configured Content-Security-Policy blocks most cross-site scripting (XSS) attacks, Strict-Transport-Security prevents downgrade and SSL-stripping attacks, X-Frame-Options stops clickjacking, and Referrer-Policy keeps your URLs from leaking to third parties. None of these headers require code changes to your application — they're set in your web server, CDN, or framework middleware. Auditing them is the single fastest hardening win for any production website.

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