Free HTTP Security Headers Checker — CSP, HSTS, and Browser Hardening
HTTP Security Headers Checker
Free HTTP security headers checker
Test CSP, HSTS, and other browser hardening headers on a live public URL.
Free HTTP Security Headers Checker for Practical Hardening
Free HTTP security headers checker. Test CSP, HSTS, X-Content-Type-Options, and more. Practical hardening checks for website owners and cybersecurity students.
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How to improve security headers without breaking the site
Enable HSTS and nosniff first — they rarely break pages. Introduce CSP in report-only mode, watch violations, then enforce. I roll headers through staging before production so a strict CSP does not blank a checkout page.
Headers that actually move the needle
On portfolio and business sites, missing HSTS and CSP show up constantly. This checker gives owners a clear punch list instead of a vague “improve security” note.