Getting browser warnings? Visitors seeing "Not Secure" in their address bar? Your SSL certificate is probably expired or misconfigured. This tool checks your certificate validity, expiration date, TLS version, and certificate chain in seconds.
We verify your certificate is properly signed by a trusted Certificate Authority and has not been revoked. Self-signed certificates trigger browser warnings for visitors.
SSL certificates expire after 90 days to one year depending on your provider. We show exactly how many days remain and warn you before expiration causes downtime.
TLS 1.0 and 1.1 are deprecated and insecure. We check which versions your server supports and flag outdated protocols that could leave you vulnerable.
A missing intermediate certificate causes browser warnings even when your main certificate is valid. We verify the complete chain from your cert to the root CA.
Your certificate must match your exact domain name. We check the Common Name and Subject Alternative Names to make sure your certificate covers the right domains.
After checking thousands of certificates, here is what breaks most often:
This warning appears when your SSL certificate is expired, misconfigured, or not trusted by the browser. Common causes include an expired certificate, a certificate issued to a different domain name, or a missing intermediate certificate in your chain. Run our SSL checker to find the exact problem.
Check your certificate at least monthly and set a calendar reminder for 30 days before expiration. Most certificates expire after 90 days or one year. Expired certificates cause browser warnings that scare away visitors and hurt SEO rankings.
Your site should support TLS 1.2 at minimum, and TLS 1.3 is recommended. TLS 1.0 and 1.1 are deprecated and considered insecure. Most modern browsers no longer support these older versions.