Site Safety Checker
Inspect HTTPS, TLS, DNS, redirects and security headers in one deterministic safety score.
Security
Free SSL Certificate & TLS Checker
Check an SSL certificate, expiry date, hostname, TLS version, cipher suite and certificate chain for free.
Your input is processed only as required by this tool.
Free SSL Certificate & TLS Checker
Use this checker to inspect the certificate presented on port 443 and the negotiated TLS connection. It is useful when diagnosing certificate expiration, hostname mismatches, outdated TLS configuration or deployment mistakes after changing hosting, proxies or CDNs.
How to use it
- Enter the public URL or domain you want to inspect.
- Run the check and let Ciatto Tools collect only the signals required for this diagnostic.
- Review the result, warnings and related checks before making a security or configuration decision.
How to read the result
Pay special attention to certificate validity, days remaining, hostname coverage and the negotiated TLS version. TLS 1.3 is preferable when available, while a valid TLS 1.2 connection can still be secure when correctly configured.
Limitations
This check validates the endpoint reached by public DNS at the time of the request. Load balancers, regional endpoints and rapidly changing infrastructure can return different certificates from other locations.
Frequently asked questions
How do I know when an SSL certificate expires?
Run the domain through the checker and review the expiration date and remaining days returned from the leaf certificate.
Does this checker support TLS 1.3?
Yes. The result reports the TLS version and cipher suite negotiated with the public endpoint.