What is an SSL/TLS certificate?

An SSL/TLS certificate confirms a website’s identity and enables encrypted data transfer (HTTPS). It contains the common name, the issuing CA, the validity period and the covered domains (SAN).

How do I recognise a valid certificate?

A valid certificate is within its validity period, issued by a trusted certificate authority and matches the requested hostname. This SSL check also indicates whether the certificate chain could be verified as trusted.

What does the TLS version mean?

The TLS version (e.g. TLS 1.2 or TLS 1.3) indicates the encryption protocol used. TLS 1.3 is the most secure and fastest; versions before TLS 1.2 are considered outdated and insecure.

SSL Check – Analyze SSL/TLS Certificate of a Website

Enter a URL or domain to check the SSL certificate. Works without https:// too.

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What is an SSL certificate?

An SSL/TLS certificate is a digital document that confirms the identity of a website and enables encrypted data transmission. The "https://" in the address bar indicates that a secure connection exists. Important components: The CN (Common Name) specifies which domain the certificate was issued for. The CA (Certificate Authority) is the trusted entity that issued the certificate (e.g. Let's Encrypt, DigiCert). SAN entries (Subject Alternative Names) list all domains for which the certificate is valid.