HSTS Status Checker
Check HSTS policy strength and browser enforcement configuration for strict HTTPS transport behavior.
The HSTS Checker validates whether your site enforces HTTPS through Strict-Transport-Security headers and highlights policy shape including max-age, includeSubDomains, and preload readiness.
This is critical for preventing protocol downgrade risk and proving that secure transport policy remains consistent across production and staging entry points.
About this tool
This HSTS checker inspects live HTTPS responses and parses the
Strict-Transport-Security header. No traffic is altered,
intercepted, or stored.
Results reflect how modern browsers interpret the domain at the time of inspection.
HSTS summary
HSTS status
Browser behaviour
Raw response header
Learn More
Explore implementation guidance, full FAQs, and API documentation for this tool.