Certline opens a real TLS connection and tells you whether your server’s chain is complete — intermediate included or missing.

What the report gives you

• Expiry The exact date — and days remainingSits alone at the top of the report so it reads instantly.
• Issuer Who signed the certificateCommon name and organization, exactly as the server presented them.
• Covered hostnames Every name in the Subject Alternative NamesSo you see at a glance whether the certificate covers the host you care about.
• Chain completeness Did the server send its intermediate?A valid certificate still breaks connections when the intermediate is missing.

The point is the chain, not just the date

A certificate can be valid and the site still fail. Desktop browsers paper over a missing intermediate from their cache; mobile clients do not. That failure is invisible to anyone looking only at the expiry date — and it is the one people lose a weekend to.

Certline reads the certificate the server actually presents and reports whether the intermediate travelled with it. No guessing, no assumptions, no filling gaps with typical values. If a field is absent, the report says it is absent.

Answers on demand. Nothing else.

Certline answers when you ask it. It does not run on a schedule, and it does not reach you. There is no account, nothing is saved, and nothing survives a cleared browser.

• —No accountsNothing to sign up for, nothing stored about you.
• —No alerts or remindersThere is no mail sender here. The tool reports when you ask it.
• —No scheduled re-checksNothing runs when the page is closed.
• —One hostname at a timeIt checks exactly the host you type. It never scans a range or enumerates subdomains.