Website Security Checker
Harden Web Defenses
Basic configuration mistakes leave websites vulnerable to XSS and clickjacking attacks. ScanFix verifies defensive HTTP security headers automatically.
What ScanFix Checks On Your Site
Deterministic auditing aligned with W3C standards, axe-core rules, and Google Core Web Vitals.
Strict Transport Security (HSTS)
Enforces encrypted HTTPS connections and mitigates SSL stripping and man-in-the-middle exploits.
Content-Security-Policy (CSP)
Audits defensive CSP headers that prevent cross-site scripting (XSS) and unauthorized external script injection.
Clickjacking & MIME Protection
Verifies X-Frame-Options (DENY/SAMEORIGIN) and X-Content-Type-Options (nosniff) headers.
Frequently Asked Questions
Everything you need to know about our automated website checks.
Why are HTTP security headers necessary if I have HTTPS?
HTTPS encrypts data in transit, but security headers instruct the browser on how to isolate scripts, protect cookies, and block framing attacks.
How do I add security headers in Next.js or Vercel?
ScanFix generates a drop-in `headers()` configuration block for your `next.config.ts` file with standard security headers pre-configured.