HSTS Checker
Check Strict-Transport-Security configuration, preload readiness, and transport hardening posture.
Best for teams validating HTTPS enforcement after certificate changes, CDN updates, subdomain expansion, or a broader transport-security hardening pass.
What This Tool Checks
- Policy strength validation
- Preload readiness checks
- Transport hardening actions
Why It Matters
HSTS is one of the clearest transport-hardening controls, but it only helps when the policy is strong, consistent, and aligned with preload or subdomain expectations.
Best For
Best for teams validating HTTPS enforcement after certificate changes, CDN updates, subdomain expansion, or a broader transport-security hardening pass.
What To Do Next
Use the result to confirm whether you only need a policy adjustment or whether you should review redirect behavior, subdomain readiness, and preload eligibility too.
Related Resources
What does the HSTS Checker look for?
HSTS Checker focuses on policy strength validation, preload readiness checks, transport hardening actions. It is designed to help teams identify this category of weakness quickly and then move into broader workflows if deeper follow-up is needed.
What is the difference between Quick and Comprehensive mode?
Quick mode stays public for focused diagnostics. Comprehensive mode is intended for authenticated workflows where users need saved history, richer follow-up, and broader account-linked execution.
When should I use the full Vulnify platform instead?
Use the full platform when you need more than one focused diagnostic, want to keep reports and history, or need scheduled scans, exports, and broader vulnerability coverage beyond hsts checker.