Security Headers Auditor
Free ToolAudit your HTTP security response headers in real time. Get an instant security grade (A+ to F), vulnerability checks, and remediation tips.
Instant 0ms
100% Client-Side
Security Score
HTTP
/ 100
Security Health
Excellent defense against XSS & framing! Moderate protection. Add missing headers. Vulnerable to common web injection attacks.
HTTP Security Response Headers Audit
Header Value:
Recommended Fix:
Frequently Asked Questions
Security headers instruct browsers how to handle sensitive content, preventing Cross-Site Scripting (XSS), clickjacking, MIME sniffing, and man-in-the-middle attacks.
Content-Security-Policy (CSP) and Strict-Transport-Security (HSTS) provide the strongest foundational defense against modern web exploits.
Enable HSTS with preloading, define a restrictive CSP policy, block framing with X-Frame-Options, enable nosniff, and configure a strict Referrer-Policy.