Security Headers Checker

See the HTTP response headers a site sends and which security headers are missing, with copy-ready fixes.

Why it matters

Security headers protect visitors from clickjacking, content sniffing and data leaks. They are quick to add and signal a well-maintained site.

How to use the Security Headers Checker

  1. Enter a URL Type the page or domain you want to check.
  2. Run the check We fetch it live, the way a crawler does.
  3. Fix what you find Each issue comes with a plain-English fix.

Frequently asked questions

Will adding CSP break my site?

A strict Content-Security-Policy can block scripts you rely on. Start with Content-Security-Policy-Report-Only to test before enforcing.

Where do I add these headers?

In your server config (.htaccess on Apache, server block on Nginx), your CDN settings, or a security plugin.