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Security Headers Checker

Verify the presence of essential security headers.

What Is a Security Headers Checker?

The Security Headers Checker fetches the response headers of a URL and verifies the presence of essential security headers such as Strict-Transport-Security, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy. It also flags when the server banner is exposed.

How to Use This Security Headers Checker

  1. 1
    Enter a URLProvide the full URL, for example https://example.com.
  2. 2
    Click CheckThe tool requests the page and collects the response headers.
  3. 3
    Review coverageSee which security headers are present, missing, or risky.

Frequently Asked Questions

Strict-Transport-Security (HSTS) and Content-Security-Policy have a large impact. However, the most important header depends on the application and its threats.
The Server header can reveal the server software and version, giving attackers a starting point. Many deployments hide or remove it.
The tool fetches only the response headers using a secure range of hosts and protocols, with SSRF protection and a timeout.

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