HTTP Security Header Checker
Check your website's security headers and get an A+ to F grade. Free — no signup required.
10 checks remaining this hour
Security Headers
Checks for HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy.
Information Disclosure
Detects Server and X-Powered-By headers that reveal your technology stack to attackers.
A+ to F Grading
Get a clear letter grade with actionable recommendations to improve each header.
Grading Scale
A+
100
Excellent
A
90-99
Great
B
80-89
Good
C
70-79
Fair
D
60-69
Poor
F
< 60
Failing