Security Header Checker
Analyze response headers, uncover missing protections, and strengthen your site's security posture.
Problem: Missing security headers
Without the right HTTP headers, browsers cannot enforce security rules that prevent common attacks.
Security headers control how browsers handle scripts, framing, and transport security. If they are missing or misconfigured, users are exposed to XSS, clickjacking, and insecure HTTP fallbacks.
Browser protection gaps
Missing CSP, HSTS, or X-Frame-Options leaves pages vulnerable to injection and framing attacks.
Inconsistent policy coverage
Security headers can differ across redirects, subdomains, or environments without a centralized audit.
Lack of actionable insight
Teams often know headers are important but lack a clear checklist to prioritize fixes.
Tool input area
Enter a domain or URL to scan its live response headers.
Security Header Check
Enter a domain or URL to analyze its HTTP security headers and get security recommendations.
How results help users
Translate header data into clear next steps for your security roadmap.
Security Header Analysis
Comprehensive analysis of HTTP security headers
CSP & HSTS Validation
Check Content Security Policy and HSTS configuration
Performance Insights
Response time and protocol analysis
Security Grading
Get an A-F security grade with detailed scoring
Advanced technical explanation
Understand how the scanner gathers data and evaluates your headers.
The scanner sends an HTTPS request, follows redirects, and captures the final response headers. It normalizes header names, evaluates recommended directives, and calculates a grade based on coverage and strength.
- Redirect chains are inspected to ensure security headers persist on the final destination.
- Header values are parsed to confirm key directives like max-age, frame-ancestors, and report-only modes.
- Response timing metrics highlight latency that can impact header delivery and caching behavior.