SSL Certificate Checker — How to Verify Your Site's Security

Nothing scares visitors away faster than a 'Not Secure' browser warning. Learn how to check and monitor your SSL certificate status.

Nothing scares visitors away faster than a browser warning that says "Your connection is not private." That happens when your SSL certificate is expired, misconfigured, or missing entirely. For website owners, monitoring your SSL status should be routine.

What is an SSL certificate?

An SSL (Secure Sockets Layer) certificate enables HTTPS on your website, encrypting the data between your visitors' browsers and your server. Without it, data travels in plain text — meaning anyone on the network can read it. That includes passwords, credit card numbers, and personal information.

Google Chrome marks HTTP sites as "Not Secure" in the address bar. Google also uses HTTPS as a ranking signal. So SSL isn't optional anymore — it's table stakes.

What can go wrong

Expired certificates. SSL certificates have expiration dates, typically 90 days (Let's Encrypt) to 1 year. If you forget to renew, your site suddenly shows security warnings and visitors bounce.

Misconfigured certificates. The certificate is for "www.example.com" but your site also serves "example.com" without the www. Visitors on the non-www version get a warning.

Certificate chain issues. The intermediate certificate is missing, so some browsers don't trust your certificate even though it's technically valid.

Mixed content. Your page loads over HTTPS but includes images or scripts over HTTP. Browsers may block the insecure content or show warnings.

Check your certificate

Toolozo's SSL Checker lets you enter any domain and see the full certificate details: issuer, expiration date, certificate chain, supported protocols, and any configuration issues. Run it on your own sites periodically, or use it to check a suspicious website before entering any personal information.