SSL Certificate Checker

The padlock icon in your browser's address bar is powered by an SSL/TLS certificate — a digital document that verifies your website is who it says it is and encrypts the connection between visitor and server. These certificates expire, typically every 90 days for free certificates (like Let's Encrypt) or annually for paid ones.

Enter any domain below to check whether its certificate is valid, when it expires, who issued it, and which domain names it covers. A certificate expiring within 30 days needs urgent renewal to avoid browser security warnings.