Certificate grade, issuer, expiry date & SANs — instant results, no login.
100% free · No login · Live certificate read
The SSL/TLS Checker connects directly to your domain's server and reads the live certificate — the same one your visitors see. It returns the security grade (A–F), the certificate issuer (Let's Encrypt, DigiCert, etc.), valid-from and valid-to dates, days remaining, and the full list of Subject Alternative Names covered.
Share any SSL check with /tools/ssl.php?domain=example.com for instant results on load.
The grade (A–F) reflects certificate validity and configuration: A = valid, not expired, and trusted issuer; B/C = minor issues like short validity; D/F = expired, self-signed, or untrusted.
Enter your domain — the tool shows the exact expiry date and days remaining. Certificates within 30 days show a warning; within 7 days show a danger alert.
SANs list all hostnames a single certificate covers — for example, a wildcard cert may cover *.example.com and example.com under one certificate.
The tool reads the live certificate directly from your server. If it reports expiry, your server is still serving the old certificate even if you renewed — check your server/CDN config.