Check any SSL certificate
instantly — for free
See expiry date, issuer, protocol version, and all covered domains. No signup required.
What does this SSL checker verify?
Expiry date
Shows exactly when your certificate expires and how many days remain. Get a warning if it expires within 30 days.
Certificate issuer
Shows which Certificate Authority issued the cert — Let's Encrypt, DigiCert, Sectigo, or others.
TLS protocol version
Checks if you're using TLS 1.2 or 1.3. Older versions (TLS 1.0, 1.1) are deprecated and insecure.
Covered domains (SANs)
Lists all domains covered by the certificate, including wildcards like *.example.com.
Validity status
Confirms whether the certificate is currently valid and trusted by browsers.
Real-time check
Connects directly to the server and reads the live certificate — no cached data.
Need ongoing SSL monitoring?
SiteBrief checks your SSL every day and alerts you 30 days before expiry. Add unlimited sites, get PDF reports, and monitor uptime — all in one place.
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