What is SSL Certificate Checker
This tool inspects website SSL/TLS certificate status and common security headers to help identify expiration, misconfiguration, and missing protections.
Key Features
- Check certificate validity period, issuer, and host matching.
- Highlight remaining days and risk level.
- Verify presence of common security response headers.
- Keep local check history and provide quick examples.
Steps
- Enter host and select port.
- Start the check.
- Review certificate details and warnings.
- Fix certificate or header configuration based on results.
FAQ
Why can a site still open when the tool reports certificate issues?
Browser cache, intermediate certificate behavior, or compatibility fallbacks may still allow access, but that does not guarantee secure or recommended configuration.
Does missing security headers invalidate the certificate?
No. Certificate validity and security headers are different concerns, but missing headers still increase attack surface and should be fixed.