SSL Checker Tool

Check if a domain has a valid SSL certificate and view its expiration details.

What is SSL and How Does This Tool Work?

SSL (Secure Sockets Layer) is a standard security protocol for encrypting connections between web servers and browsers. This ensures that data transferred remains private and secure.

This tool connects to the domain over port 443 (HTTPS) and fetches its SSL certificate. It parses fields like:

Common Name (CN): The domain name the certificate is issued for.
Issuer: The Certificate Authority (CA) who issued the SSL.
Valid From/To: The certificate's active period.
Serial Number: Unique identifier for the cert.
Signature Algorithm: Method used to sign the certificate (e.g., sha256WithRSAEncryption).

If your certificate is expired or invalid, browsers will show a "Not Secure" warning.