Free Security Headers Checker & HTTP Analyzer

Test your website's HTTP security headers online. Check CSP, HSTS, X-Frame-Options, and essential security headers to protect against XSS, clickjacking, and attacks. Get instant A+ security scores and recommendations.

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No credit card required • Instant results

CSP Analysis

Check Content Security Policy configuration to prevent XSS attacks and unauthorized resource loading

HSTS Validation

Verify HTTP Strict Transport Security headers to enforce secure HTTPS connections

Missing Headers

Identify missing security headers and get recommendations to improve your website's security posture

Security Headers We Check

Essential Headers

  • Content-Security-Policy (CSP)
  • Strict-Transport-Security (HSTS)
  • X-Frame-Options
  • X-Content-Type-Options

Additional Headers

  • Referrer-Policy
  • Permissions-Policy
  • Overall security score

Why Security Headers Matter

HTTP security headers are your first line of defense against common web vulnerabilities. They tell browsers how to behave when handling your site's content, preventing attacks like cross-site scripting (XSS), clickjacking, and man-in-the-middle attacks. Our free checker analyzes your headers and provides actionable recommendations to enhance your website security.

More HTTP and SSL security tools

CSP Checker

Evaluate Content-Security-Policy effectiveness, unsafe-inline, wildcards and missing directives.

HSTS Checker

Validate the Strict-Transport-Security header and preload status.

Cookie Security Checker

Audit cookies for Secure, HttpOnly and SameSite flags.

CORS Misconfiguration Checker

Detect arbitrary-origin reflection and credentialed CORS misconfigurations.

Subresource Integrity Checker

Verify SRI hashes and find third-party resources missing integrity protection.

SSL Certificate Checker

Validate the certificate, chain and expiry of any site.

This is one layer of the scan

Free

This Security Headers Check scan covers one category. A full scan adds the checks it does not reach: exposed secrets, malicious scripts, and supply chain risks in your third-party code.