Free SSL Tool
Check whether your website certificate is healthy, trusted, and close to expiry.
Enter a domain to review HTTPS availability, certificate issuer, expiry timing, and whether the certificate appears to match the hostname you expect visitors to use.
Run the Tool
What the SSL checker validates
This tool focuses on the basics that matter most operationally: whether HTTPS is available, who issued the certificate, how long it has before expiry, and whether the certificate seems to belong to the hostname you tested.
SSL Health Score
Run the tool to see your results.
When a result is ready, you’ll see your score or risk level, plain-English findings, and the next actions worth prioritizing.
How To Use This Result Safely
Helpful guidance, not a final security or legal conclusion.
This tool uses public records, safe response metadata, or the answers you provide. It does not perform intrusive testing or exploit scanning.
- Use this result as educational guidance and a discussion starter, not as a penetration test, exploit scan, or final security verdict.
- Do not treat the result as legal, compliance, insurance, or regulatory advice.
- Important decisions should still be validated through a professional review of your real environment, vendors, and business requirements.
What the SSL checker validates
This tool focuses on the basics that matter most operationally: whether HTTPS is available, who issued the certificate, how long it has before expiry, and whether the certificate seems to belong to the hostname you tested.
- HTTPS reachability on port 443
- Certificate issuer and validity window
- Expiry date and days remaining
- Basic hostname matching against certificate names
Why certificate health matters
Expired or mismatched certificates create browser warnings, break trust, and can cause support issues or business disruption. Healthy certificate lifecycle management is a small operational discipline that protects user confidence and keeps your site accessible.
Professional Review
Want a professional review of your results?
If a certificate is close to expiry or mismatched, Red Shield IT can help review the hosting stack, DNS, reverse proxy path, and renewal process before it becomes an outage.
What a consultation can help clarify
- Whether the result reflects a configuration gap, an operational gap, or both
- Which issues should be prioritized first for security or business impact
- What a realistic remediation plan looks like for your environment
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Open ToolFAQ
Common questions about SSL Certificate Checker.
Will this tell me if my entire TLS configuration is modern?
No. This checker focuses on certificate availability, expiry, issuer information, and hostname matching. A full TLS review would also assess protocol versions, ciphers, and other server behaviors.
Why can a certificate show as valid locally but still create browser warnings?
Warnings can also come from incomplete certificate chains, hostname mismatches, or intermediate certificate issues. This checker provides a practical baseline, but some browser-specific trust issues need deeper analysis.
How early should certificates be renewed?
Many teams renew well before expiry to avoid service risk, especially for critical websites, customer portals, and externally facing applications.