What This Tool Checks
HeaderCheckr scans the final response, grades key browser security headers, and shows missing protections with practical starting fixes.
Security
Security Headers Checker
Analyze your HTTP security headers instantly. Free, fast, and private.
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Guide
Security Header Checks
Security headers tell browsers how to handle framing, MIME sniffing, referrers, HTTPS enforcement, and content loading rules.
Use this checker when you want a quick read on what your site is already sending and which missing headers are worth fixing first.
Why It Matters
Strong headers reduce common browser-side risks such as clickjacking, MIME confusion, referrer leakage, and unsafe content loading.
They are not a full security audit, but they are one of the simplest ways to improve the baseline every visitor receives.
Related Tools
After checking headers, inspect SSL certificate health, redirect chains, and HTTP protocol support.
FAQ
Which security headers does HeaderCheckr scan?
It checks Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy.
Does a good grade mean my site is fully secure?
No. Security headers are one layer. You still need secure application code, patched dependencies, and safe infrastructure.
Where should I add security headers?
Most teams add them at the CDN, reverse proxy, hosting platform, or framework middleware layer so they apply consistently.