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HTTP Security Headers Checker

Analyze your website's security headers and get an A-F grade with actionable recommendations for HSTS, CSP, X-Frame-Options, and more.

Enter a URL to analyze its HTTP security headers

What We Check

HSTS

Strict-Transport-Security prevents downgrade attacks and cookie hijacking

CSP

Content-Security-Policy prevents XSS and data injection attacks

X-Frame-Options

Prevents clickjacking attacks by controlling page framing

+ 6 More Headers

X-Content-Type-Options, Referrer-Policy, Permissions-Policy, and more

Why HTTP Security Headers Matter

HTTP security headers are your first line of defense against many common web attacks. They tell browsers how to behave when handling your site's content, helping prevent XSS, clickjacking, MIME-type sniffing, and protocol downgrade attacks.

Key Security Headers:

  • Strict-Transport-Security (HSTS) – Forces HTTPS connections, preventing man-in-the-middle attacks
  • Content-Security-Policy (CSP) – Controls which resources can load, preventing XSS attacks
  • X-Frame-Options – Prevents your page from being embedded in iframes (clickjacking protection)
  • X-Content-Type-Options – Prevents MIME-type sniffing attacks
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