When you visit a website, you expect it to be safe. You look for the little padlock icon in the browser address bar, trusting that it means your credit card details and passwords are secure. That padlock is powered by an SSL Certificate. But here is the scary part: SSL certificates expire. They can be installed incorrectly. They can be issued by untrustworthy authorities. When any of this happens, that padlock disappears, and visitors see a terrifying warning: "Your connection is not private." An SSL Checker is the diagnostic tool that prevents this disaster. It scans a website's security certificate to ensure it is valid, trusted, and correctly installed. Whether you are a website owner protecting your business or a user verifying a suspicious link, this tool is your first line of digital defense. This guide explains exactly how SSL works, why certificates fail, and how to use an SSL Checker to spot problems before they crash your site. What Is an SSL Checker? An SSL Che...