SSL Certificate Checker
Certificates issued for a domain, pulled from public Certificate Transparency logs (crt.sh) — issuer, validity dates and expiry status.
Check the SSL certificate of any website — validity dates, covered domains and revoked or expired certificates — using public Certificate Transparency logs. No account needed, results in seconds.
Data: public Certificate Transparency logs (certspotter API).
How to use the SSL Certificate Checker
- Enter a domain name.
- Certificates are pulled from CT logs and listed newest first.
- Green = valid, red = expired or revoked — check the date range shown.
Frequently asked questions
How do I check if a site's SSL certificate is valid?
Enter the domain above — the checker lists its certificates from public CT logs with validity dates and status.
Where does the certificate data come from?
Public Certificate Transparency logs, which record every publicly issued certificate.
What does 'revoked' mean?
The certificate was cancelled before its expiry date, usually after a key compromise or mis-issuance.
Why do I see multiple certificates?
Sites renew certificates regularly, often every 90 days. Older, non-expired ones still appear in logs.