Website security tool
HTTP Security Headers Checker
Inspect a focused allowlist of browser security policies and receive a simple Excellent, Good, or Weak grade.
What the grade means
The grade measures presence of six recommended headers. It does not audit policy quality, application code, TLS configuration, authentication, or infrastructure security.
Common questions
Frequently asked questions
Does a high grade prove a website is secure?
No. Security headers are one defensive layer. Application vulnerabilities, authentication, dependencies, infrastructure, and operational controls still matter.
Does the checker download the page body?
No. It sends a HEAD request and returns only a small allowlist of security-related response headers.
Can the checker access private network addresses?
No. Private, loopback, link-local, reserved, and non-standard-port destinations are blocked before the connection.