FREE TLS CERTIFICATE CHECKER

TLS Certificate Checker

Verify SSL and TLS certificates for any public hostname. This free TLS Certificate Checker retrieves certificate information directly from the target service and displays important security details such as expiration dates, certificate issuer, common name, subject alternative names (SANs) and supported TLS versions.

Whether you are troubleshooting certificate warnings, preparing for certificate renewal or validating a new deployment, this tool provides a quick overview of the certificate presented by a server.

What does this TLS Certificate Checker verify?

The tool connects directly to the specified hostname and performs a TLS handshake to retrieve the active certificate. It validates that a certificate is presented and extracts key information needed for security reviews and operational checks.

Results include certificate validity dates, issuer information, common name, subject alternative names, signature algorithm and negotiated TLS protocol version. This helps identify expired certificates, incorrect certificate assignments and outdated TLS configurations.

Who is this TLS Certificate Checker for?

This tool is designed for system administrators, DevOps engineers, developers, hosting providers, security teams and website owners who need to verify SSL/TLS configurations quickly.

It is especially useful during certificate renewals, cloud migrations, load balancer deployments, web server upgrades and routine security audits where certificate validity and TLS configuration must be verified.

Information retrieved

This tool will check port 443, if you need to check FTPS TLS certificates use our FTP Connection tool