SSL Certificate Checker

An SSL certificate encrypts the connection between a visitor's browser and your server, preventing anyone on the network from reading or modifying the data in transit. Without it, login credentials, form submissions, and payment details are sent in plain text. Beyond security, browsers now mark HTTP sites as "Not Secure" in the address bar, and Google uses HTTPS as a ranking signal. A missing or expired certificate will trigger a full-page browser warning that most visitors will not click through.

The most frequent problems are expired certificates, mismatched domain names, and incomplete certificate chains. An expired cert triggers an immediate browser warning — set up monitoring or auto-renewal with Let's Encrypt to avoid this. A name mismatch happens when the certificate was issued for www.example.com but the site is accessed at example.com (or vice versa) — use a certificate that covers both, or a wildcard cert for *.example.com. An incomplete chain means your server is not sending the intermediate certificates that browsers need to verify the chain of trust back to a root CA.