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
- Whether the certificate chain is trusted
- Issuing authority (CA)
Why certificates expire
SSL/TLS certificates are deliberately short-lived. Let's Encrypt certs last about 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 is watching.
How to read your result
Valid: more than 30 days left and trusted. You're fine for now, but the clock is always running.
Expiring soon / Untrusted: 30 days or fewer, or the chain isn't trusted. Renew or fix the chain before visitors see a warning.
Expired: visitors are already seeing a security warning. Renew immediately.
Frequently asked
- How often should I check my SSL certificate?
- Manually, you'd need to check every certificate every few weeks, since Let's Encrypt certs last about 90 days and the industry maximum is dropping fast. That's exactly why continuous monitoring exists.
- Why does my certificate keep expiring?
- Most certs auto-renew, but renewals silently fail (DNS change, billing lapse, a moved server). Nothing tells you until a visitor sees the browser warning, unless something is watching the expiry date for you.
- Can I get alerted before it expires?
- Yes. VigilDog watches the certificate and warns you 30, 14 and 7 days before it lapses, across every client domain at once.
Never check by hand again.
VigilDog watches this certificate, plus every client domain, DNS record and email setting, 24/7, and warns you days before anything expires.