SSL Checker
Verify SSL/TLS certificates — chain of trust, expiration, cipher suite, SANs, and TLS version.
What is an SSL/TLS Certificate?
SSL/TLS certificates authenticate a website's identity and enable encrypted HTTPS connections. A certificate binds a domain name to a cryptographic key pair and is signed by a trusted Certificate Authority (CA). Browsers verify the certificate chain — from the leaf certificate to a trusted root CA — to ensure the connection is secure.
Key things to check: the certificate should not be expired, the domain should match the Subject or SANs (Subject Alternative Names), the TLS version should be 1.2 or 1.3, and the signature algorithm should use modern cryptography (ECDSA or RSA with SHA-256+).
Connects to the server's port 443, performs a TLS handshake, and inspects the certificate chain. We do not log domains or store results.