Why would you check an SSL certificate?
Due to the sheer amount of protocol features, it's getting complex to fully understand the implementation of a secure server.
G Suite.Tools' free SSL Checker instantly obtains and analyzes the SSL certificate from any public endpoint. In a single click, retrieve all the information related to the certificate returned by the remote server inluding its issuer, alternative names and expiration date.
This online utility is powered by OpenSSL in order to provide you with the most reliable results.
You DO need to encrypt your communications
A valid SSL certificate (Certificate-based Authentication, or CA certificate) guarantees a secure connection and does not allow eavesdropping, hijacking or man-in-the-middle attacks.
You can obtain free SSL certificates from Let’s Encrypt.
Simple as usual. Enter the complete domain or IPv4 you want to query, and associated port if different than 443, and press 'Check'. Please clean your input from any prefix (e.g. 'http(s)://') or suffix (e.g. '/page12') before launching your request.
In an instant, get the diagnostic information you're looking for.