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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. This free online security tool is useful for security headers checker, HTTP security headers checker, website security header scanner. Common use cases include reviewing HSTS, CSP, X-Frame-Options, Referrer-Policy, Permissions-Policy, and other HTTP security controls. It is designed for quick browser-based analysis and development workflows. Security checks are signals rather than guarantees, so production systems should also be validated against current standards and their specific threat model.

How to Use This Security Headers Checker

  1. 1
    Enter the URLProvide the web address you want to inspect.
  2. 2
    Fetch the responseThe tool retrieves the HTTP response information.
  3. 3
    Review headersInspect security controls, server information, cookies, redirects, and status details.
  4. 4
    Identify weaknessesPay attention to missing protections or unnecessary information disclosure.
  5. 5
    Harden the serverApply changes in the web server or application and recheck the result.

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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