Connect to any host on port 443 (or custom), pull its TLS certificate, and inspect the full chain — issuer, expiry, SANs, TLS version, cipher, and signature algorithm.
A certificate check is one moment in time. SEODECK watches expiry every day alongside uptime, speed and every page’s SEO tags, and emails you before visitors see a warning. Run the free SEO check or start 30 days free.
We connect directly to the host over TLS using Server Name Indication (SNI), then inspect the peer certificate chain presented by the server. We accept invalid certs so you can inspect broken ones — the issues panel will flag expiry, self-signing, hostname mismatch, weak signatures, and old TLS versions.