Free tool
Check a site's SSL certificate: when it ends, who issued it, the names it covers, and whether visitors are sent to https.
example.com
75 days left. Issued October 14, 2026.
Visitors who type the plain address are sent to the secure site.
Every check reads only what the site and its public DNS show. Nothing is signed in to, submitted, or attacked.
Enter the domain above. We read the certificate straight from the site and show the date it ends and how many days are left.
Usually one of four things: the certificate expired, it does not cover the exact name visitors use (www or not), the intermediate certificate is missing, or the page loads some content over plain http.
For almost every site, yes. Let's Encrypt certificates are trusted by every browser and renew themselves. Paid certificates add a warranty and organization checks, not stronger encryption.
Sites behind Cloudflare get Cloudflare's own certificate, which it renews automatically, and Cloudflare does not let us connect to it directly to read the dates. We still check that browsers trust it.