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.
Free with a Brainito account. No credit card required.
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.
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.
See which security headers your site is missing in seconds
One account unlocks security headers checker plus 340+ marketing tools, weekly audits, and your action plan.