SSL Certificate Checker

Check the SSL/TLS certificate of any website — expiry date, issuer, subject, protocol version, and certificate chain.

Frequently Asked Questions

Common questions about the SSL Certificate Checker tool.

The certificate binds a domain name to a public key signed by a trusted Certificate Authority (CA). It proves two things: you're talking to the right server, and the connection is encrypted in transit.

DV (Domain Validated) proves only that the requester controls the DNS — issued in minutes, free from Let's Encrypt. OV (Organisation Validated) also validates the legal entity. EV (Extended Validation) is the strictest but has lost its visual distinction in modern browsers.

Most likely (1) the server is serving the wrong cert chain, (2) the intermediate CA cert is missing from the chain, (3) the certificate was issued for `www.example.com` but accessed as `example.com`, or (4) the system clock is wrong.

TLS 1.3 for all new deployments. TLS 1.2 is acceptable with modern ciphers. Disable TLS 1.0 and 1.1 — they've been deprecated since 2018 and fail most compliance audits (PCI DSS, HIPAA, DPDPA).

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Results

Frequently Asked Questions

What does an SSL certificate prove?

What's the difference between DV, OV and EV certificates?

Why does my certificate say 'expired' when I just installed it?

What TLS protocol version should I use in 2026?

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