Security Headers Checker
NewAnalyze the HTTP security headers of any website to grade its security posture. Checks for critical headers: Content-Security-Policy (XSS prevention), X-Frame-Options (clickjacking prevention), X-Content-Type-Options (MIME sniffing), Strict-Transport-Security (HTTPS enforcement), Referrer-Policy, and Permissions-Policy. Each header is rated and explained with recommendations for missing or misconfigured headers. Provides an overall security grade.
Security Headers Checker
Check HTTP response headers for security best practices. Paste your response headers to analyze.
How to Use Security Headers Checker
- 1Enter a website URL
- 2View the response headers and security grade
- 3Check which security headers are present or missing
- 4Follow recommendations to improve the score
Your Privacy is Protected
Security Headers Checker runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
Which security header is most important?
Content-Security-Policy (CSP) is the most powerful — it prevents XSS attacks. Strict-Transport-Security (HSTS) is also critical for enforcing HTTPS.
Why Use This Tool?
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