Free tool
SecurityHTTP Security Headers Checker
Scan a public URL for HSTS, CSP, frame protections, and other security headers with pass, warn, and fail guidance.
Looks up public internet data for the target you enter. We do not store results.
Free toolSecurity headers tell browsers how strictly to treat your site. This free HTTP security headers checker fetches a public URL and scores Strict-Transport-Security, Content-Security-Policy, X-Frame-Options, and related controls so website owners, small businesses, and cybersecurity students can harden web security during testing—not after an incident. It complements email security work: the same team that publishes SPF often forgets HSTS on the marketing site.
How to use the HTTP Security Headers Checker
- 1
Enter a public http:// or https:// URL.
- 2
Tap Check headers to fetch the response and evaluate common hardening headers.
- 3
Read pass, warn, and fail counts, then follow the guidance under each header.
Why headers are low-cost web security wins
Missing CSP and frame protections keep clickjacking and script injection easier than they should be. Beginners can enable HSTS and X-Content-Type-Options quickly; deeper CSP work follows. Security testing that includes headers catches configuration gaps that vulnerability scanners may only warn about late.
Headers check example
Scan https://example.com. Note which headers pass and which fail. Then compare with a major provider such as cloudflare.com to see a stronger baseline. Use the guidance lines as a checklist for your own site—not as copy-paste attack material.
Guides and next steps
Privacy note
We request the public URL you submit and evaluate response headers. Bodies are discarded. We do not store scans.
Frequently asked questions
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