Free tool
How secure is that website?
Enter any URL and we scan it for security headers, HTTPS configuration, content security policies, and more. Get a letter grade (A+ to F) with specific recommendations to improve. Powered by Mozilla Observatory.
Website Scanner
Scan Your Website's Security Headers
Enter any website to analyze its HTTP security headers using the Mozilla Observatory. We check for content security policies, HSTS, clickjacking protection, and more.
The domain is sent to the FK94 scan endpoint and Mozilla Observatory to analyze public security headers. Scan only sites you own or are allowed to assess.
How popular sites compare
google.com
100/100A+
github.com
120/100A+
facebook.com
95/100A
amazon.com
55/100B-
wikipedia.org
70/100B+
reddit.com
85/100A-
Scan Results
Enter a domain and press Scan
Security analysis will appear here