SSL Certificate Checker

Enter a domain and the server will connect to port 443, fetch the TLS certificate, and show whether it is trusted, valid for the host, and within its validity period.

SSL Certificate Checker helps inspect HTTPS certificates for public domains. It shows whether the certificate is currently valid, whether the hostname matches the certificate names, and whether PHP can verify the trusted certificate chain.

The result includes issuer, subject, Common Name, Subject Alternative Names, validity dates, days until expiration, serial number, SHA-256 fingerprint, TLS protocol, cipher, and resolved server IPs.

The checker connects server-side to port 443 using SNI and blocks private or reserved addresses. It is useful for diagnosing expired certificates, wrong hostnames, missing intermediate certificates, and CDN or hosting TLS setup problems.