What it reads
The live certificate chain and its expiry date. Untrusted or expired fails; under 14 days left warns.
Check 18 of 54 · Web and TLS
Certificate, explained.
Your HTTPS certificate is genuine, trusted and not about to expire.
Engine 1.57.0, read 25 October 2026
Free checkScoredReliability: Definitive
Is your website set up safely?
What the check does, and where it stops.
Why it matters
An expired or untrusted certificate puts a warning in front of every visitor.
What a failure looks like
A failure is a finding in your result. The check is scored, so it can lower your score, and the Full Report gives every finding its severity and a fix. If the check cannot finish, it is recorded as unknown: it carries no penalty, and it is never a pass.
Where its limits are
We read the certificate your domain itself serves, and the one on www only when your domain serves none.
ReliabilityDefinitive: reads a published value
Check 18 is one of 15 in Web and TLS. See it in its row on the scanner page, beside the rest of Web and TLS.
See how your domain does.
The free check includes this one and takes about 30 seconds. No account. Nothing to install.