SSL Certificate Checker

Issuer, expiry, days left & covered domains for any HTTPS site.

Status

Issued to

Issued by

Valid from

Valid until

Signature

Covers (SAN)

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How to check an SSL certificate

Type a domain like example.com and press Check. The tool opens a live HTTPS connection and reads the certificate the server presents: who it was issued to and by, the valid-from and valid-until dates, the exact days remaining before expiry, the signature algorithm, and every domain the certificate covers (its SAN list).

An SSL checker connects to a site over HTTPS and reads its TLS certificate — who issued it, the domains it covers, when it was issued and when it expires, and how many days are left. Enter a domain to check its certificate live.

What to watch for

The big ones are expiry — a lapsed certificate breaks the padlock and scares visitors off — and coverage: a cert issued for example.com may not cover www.example.com unless that name is in the SAN list. This tool shows both so you can catch a problem before your users do.

FAQ

What does "days left" mean?How many days until the certificate expires. Renew before it hits zero — most people renew with 15–30 days to spare.

Does it cover www and the bare domain?Check the "Covers (SAN)" list. A certificate only secures the exact names listed there; example.com and www.example.com are separate entries.

Why does a site fail to connect?Either it does not serve HTTPS on port 443, the domain does not resolve, or its TLS is misconfigured — any of which is worth knowing.