An SSL/TLS certificate is a small file that links a website's name to a cryptographic key. It is what lets your browser open a secure HTTPS connection to the site.
The certificate lets the browser check that it is talking to the server for that name, and the key it contains is used to encrypt the traffic. The padlock in the address bar shows that this worked.
It lists the names it covers, the public key, the organisation that issued it, and two dates: when it starts and when it ends. After the end date, browsers stop trusting it.
A certificate authority signs each certificate after checking, at the very least, that the applicant controls the domain.
A valid certificate means the connection is encrypted and the name matches. It does not mean the website itself is honest or safe to use.
SSL Domain Detective lists the certificates of your domains with their end dates. Open SSL Domain Detective
SSL Domain Detective is now available on the App Store.
Last reviewed: 2026-11-02
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