google.com github.com wikipedia.orgWhat is the SSL Certificate Checker?
Enter any domain and this tool connects to it over HTTPS and reads the SSL/TLS certificate it presents — then tells you in plain English whether it’s valid, when it expires, who issued it, and which hostnames it covers. It’s the fastest way to confirm a site’s certificate is healthy or to catch one that’s about to expire.
An expired or misconfigured certificate shows visitors a scary “Not secure” warning and can tank trust and sales overnight. A good web host renews SSL automatically so this never happens.
Frequently Asked Questions
What does “valid” mean here?
It means the certificate is currently within its validity dates and its name matches the domain you entered. Browsers also verify the full trust chain back to a trusted authority; this tool focuses on expiry, issuer and hostname, which are the issues that break in practice.
Why does it say my certificate expires soon?
Most certificates last 3–13 months. If yours is inside 30 days of expiry, renew it now. Hosts that issue free auto-renewing SSL (Let’s Encrypt) handle this for you so you never get caught out.
My site works but the check fails — why?
Common causes: the site only serves plain HTTP (no HTTPS on port 443), it was briefly unreachable, or it blocks automated connections. Double-check the domain spelling and try again.
Do you store the domains I check?
No. The lookup runs live and nothing you type is saved. We only keep a short-lived per-visitor rate counter to prevent abuse.
Is this a security audit?
No — it’s a quick certificate health check (expiry, issuer, hostname coverage). For a full audit you’d also test protocol versions, ciphers and the complete chain.
