Check an HTTPS Certificate
Enter a domain or HTTPS URL to inspect its certificate on port 443.
-Certificate
-Days remaining
-Issuer
-Hostname match
Certificate Details
Host-
Valid from-
Valid until-
Subject-
Issuer-
Alternative names-
Serial number-
This tool requires
web-check-api.php in the same folder and checks the public certificate on port 443.Certificate Expiry
Expired certificates can trigger browser warnings and break secure connections. Automatic renewal should still be monitored because configuration and validation failures can happen.
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SSL Certificate Checker FAQ
What does hostname match mean?
The requested domain appears in the certificate subject or alternative-name list, including a valid wildcard where applicable.
Why can a certificate be valid but the site still fail?
TLS can also fail because of chain problems, unsupported protocols, server configuration or network issues.
Does this check every port?
No. It checks the standard HTTPS service on port 443.