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Instantly audit your website's HTTP security headers. Check HSTS, CSP, X-Frame-Options, and more to find gaps before attackers exploit them.
HTTP security headers are directives sent by a web server in HTTP responses that instruct browsers on how to behave. They protect against XSS, clickjacking, MIME sniffing, and other common web attacks without requiring any code changes.
Missing security headers expose your site to XSS, clickjacking, and data injection. Browsers rely on these headers to enforce security boundaries.
No HSTS, missing CSP, permissive X-Frame-Options, absent X-Content-Type-Options, and overly broad Referrer-Policy are the most common and dangerous omissions.
Type your website domain into the checker tool above.
We request your homepage and capture all HTTP response headers.
Inspect HSTS, CSP, X-Frame-Options, and other security directives.
Add missing headers and tighten policies based on our recommendations.
Checks Strict-Transport-Security header for max-age, includeSubDomains, and preload directives. Flags weak or missing HSTS that exposes sites to SSL stripping.
Parses Content-Security-Policy for unsafe-inline, unsafe-eval, wildcard sources, and missing directives. Recommends a policy that blocks XSS without breaking functionality.
Verifies clickjacking protection via X-Frame-Options or CSP frame-ancestors. DENY or SAMEORIGIN is required to prevent your site being embedded in malicious iframes.
Checks X-Content-Type-Options: nosniff to prevent browsers from interpreting files as a different content type. This blocks drive-by download attacks.
Validates Referrer-Policy to prevent sensitive URL data leaking to third parties. strict-origin-when-cross-origin or no-referrer is recommended.
Combines all header checks into a single score from 0-100. Track improvements over time and benchmark against industry standards.
Automate security header checks, track score trends, and get alerted when new vulnerabilities or missing headers are detected on your production sites.