Free Security Headers Checker: Find Your Site's Missing Shields
Scan your HTTP security headers in seconds and see which protections are missing, misconfigured, or leaving your visitors exposed to common attacks.
Scan Every Key Header
Check CSP, HSTS, X-Frame-Options, and more in one pass, with a clear status shown for each header.
Know What Each Fix Does
Every missing header comes with a short explanation of the attack it blocks and why it matters.
Recheck After Every Change
Run the scan again after each deploy to confirm your fixes landed and nothing quietly broke.
A security headers checker scans the HTTP response headers your server sends and reports which protective headers are present, missing, or misconfigured. Headers like Content-Security-Policy, Strict-Transport-Security, and X-Frame-Options defend visitors against common attacks such as clickjacking and cross-site scripting. This free security headers checker gives your site a clear pass-or-fail read on each header, so you know exactly which defenses to add or tighten.
What the security headers checker inspects
This security headers checker reads the response headers returned by your URL and evaluates the ones that harden a site. It looks for Strict-Transport-Security to enforce HTTPS, Content-Security-Policy to limit where scripts and assets load from, X-Frame-Options to block clickjacking, X-Content-Type-Options to stop MIME sniffing, and Referrer-Policy and Permissions-Policy to control data leakage. For each header it reports whether the value is present and sensibly configured. Rather than reading raw headers by hand, you get a structured checklist that shows at a glance which protections your server already sends and which are absent.
How to read the results and fix issues
The checker flags each header as present, missing, or weak. Start with the missing ones that carry the most weight: add Strict-Transport-Security to force HTTPS, then a Content-Security-Policy to control script sources. Treat weak values as real gaps, since a permissive policy offers little protection. Apply fixes in your web server config or CDN rather than page by page, so every response is covered. Roll out a strict Content-Security-Policy carefully to avoid breaking legitimate resources, testing in report-only mode first. Rescan after each change to confirm the header now returns the value you intended.
Why security headers matter for trust and SEO
Security headers are a quiet but real signal of a well-run site. They protect visitors from clickjacking, protocol downgrade, and injection attacks, reducing the risk of a breach that could damage your brand and search standing. A compromised or defaced site can be flagged by browsers and search engines, harming visibility and trust. Strong headers also reinforce HTTPS, which remains a baseline expectation for modern sites. While headers are not a direct ranking factor, the security and reliability they support influence user confidence and the overall technical health that search engines reward in 2026.
Frequently Asked Questions
Which security headers does the checker scan for?
It checks the headers browsers rely on most, including Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy, and reports the status of each one.
My site is small, so do security headers really matter?
Yes. Attacks like clickjacking and content injection are automated, so bots do not care about your size. Headers are one of the cheapest protections available and usually take only minutes to add.
Is the Security Headers Checker free to use?
Yes. The checker is free in 2026 once you create a Brainito account. Scan any site you own as often as you like and track how your header coverage improves between scans.
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