AI-powered
An SSL checker that reads a site's certificate and chain and looks up when the domain expires, so nothing lapses by surprise.
AvailableReady to use.
Open the tool| Check | Found | Result |
|---|---|---|
| Certificate | Expires in 54 days | Valid |
| Covers www | Yes | Passed |
| Chain | Complete | Passed |
| Domain | Expires in 19 days | Warning |
AI explains chain and protocol problems in plain words. Dates and names come from the certificate itself.
A secure connection is opened to the site.
The issuer, dates, names and full chain are read.
The registry's expiry date for the domain is looked up.
Days left, and anything that would break the padlock.
An SSL checker connects to a site the way a browser does and reads its certificate: who issued it, which names it covers and when it expires. The certificate is what puts the padlock in the address bar and keeps the connection private.
When a certificate expires or doesn't match the site's name, browsers show a full page warning and most visitors leave.
The certificate's dates and days left, the names it covers, whether the full chain of certificates is sent, which TLS versions the server accepts, and whether plain HTTP sends visitors to HTTPS.
It also looks up when the domain itself expires, because a lapsed domain takes the site and its email down even with a valid certificate.
A missing intermediate certificate works in some browsers and fails in others. A certificate for example.com that doesn't cover www.example.com breaks one of the two addresses. Automatic renewal that silently stopped is the most common cause of an expired certificate.
This check shows the state today. Uptime Monitor reads the certificate and the domain on every check and warns you weeks before either expires.
An expired domain takes the whole site and its email down, even with a valid certificate.
No. We read what every visitor's browser sees.
Most certificates renew on their own. Check that renewal works at least two weeks before expiry.
TLS is the modern version of SSL. People still say SSL for both.