Free SSL Certificate Checker
Check any domain's SSL certificate in seconds — expiry date, days remaining, issuer and validity.
What this tool checks
- Expiry date and exact days remaining
- Certificate chain validity
- Issuing authority (CA)
- Hostname / common-name match
Why certificates expire
SSL/TLS certificates are deliberately short-lived — Let's Encrypt certs last ~90 days, and the industry maximum is dropping to 47 days by 2029. Miss a single renewal and browsers throw a full-page “Not Secure” warning, visitors bounce, and forms and checkouts break — usually on a weekend, when no one's watching.
How to read your result
Valid — more than 30 days left. You're fine for now, but the clock is always running.
Expiring soon — 30 days or fewer. Renew now (or enable auto-renew) before it lapses.
Expired — visitors are already seeing a security warning. Renew immediately.
Never check by hand again.
VigilDog watches this certificate — and every client domain, DNS record and email setting — 24/7, and warns you days before anything expires.