Tools / Network
SSL Certificate Checker
Inspect any domain's SSL certificate — issuer, validity, SANs, chain and TLS version. Reads the certificate chain directly from the server and produces a detailed report on issuer, validity, SANs, TLS protocol version and the negotiated cipher suite.
The certificate behind HTTPS
An SSL/TLS certificate verifies a site’s identity to the browser and encrypts traffic end-to-end. If a certificate expires, browsers show a full-page security warning and most visitors bail out. This tool marks certificates with less than 30 days in orange and certificates with less than 7 days — or already expired — in red.
For a free certificate, Let's Encrypt is the modern standard with 90-day validity that must be auto-renewed. For wildcard and EV certificates in enterprise environments, see KEYDAL’s server security packages.
About SSL certificates
Yes. Let’s Encrypt is a fully-trusted public CA operated by ISRG and recognized by every major browser. Its encryption strength is identical to paid certificates — the only differences are the validation level (DV) and the 90-day lifetime.
DV (Domain Validated) only verifies domain ownership — issued in minutes. OV (Organization Validated) also verifies the legal entity. EV (Extended Validation) is the most thorough check; the old green-bar UI has been removed from modern browsers, but some regulated industries still prefer EV for compliance and trust.
The SAN list enumerates every hostname the certificate is valid for. Modern browsers check the SAN list (not the legacy Common Name) and reject the certificate if the host isn’t listed. Wildcard certificates (*.example.com) only cover a single level of subdomains.
Yes. TLS 1.3 is faster (1-RTT / 0-RTT handshake), removes weak ciphers and mandates perfect forward secrecy. TLS 1.0 and 1.1 are banned by PCI-DSS; TLS 1.2 is the floor and TLS 1.3 is the recommendation.
SSL and server security in one place
Auto-renewing certificates, WAF, DDoS protection and security audits — included.