Security Header Checker

Analyze HTTP security headers (HSTS, CSP, X-Frame-Options, etc.) with scoring and recommendations

All processing happens in your browser. No data is uploaded.

Offline Ready

Security Header Checker

Analyze HTTP security headers (HSTS, CSP, X-Frame-Options, etc.) with scoring and recommendations

🔒All processing happens in your browser. No data is uploaded.

HTTP Response Headers

Paste HTTP response headers here... Example: Strict-Transport-Security: max-age=31536000 Content-Security-Policy: default-src 'self' X-Frame-Options: DENY