🔒 SSL Certificate Checker
Inspect the SSL/TLS certificate of any domain. Check validity, issuer, expiration date, cipher suite, and certificate chain.
What is an SSL/TLS Certificate?
An SSL/TLS certificate is a digital document that authenticates a website's identity and enables encrypted communication between a web browser and a server. It ensures that data transmitted between users and websites remains private and integral.
Key Certificate Fields
| Field | Description |
|---|---|
| Common Name (CN) | The fully qualified domain name the certificate is issued for |
| Issuer | The Certificate Authority (CA) that issued the certificate |
| Validity Period | The date range during which the certificate is considered valid |
| Subject Alternative Names | Additional domain names covered by the certificate |
| TLS Version | The protocol version used for the secure connection |
| Cipher Suite | The set of encryption algorithms used for the connection |