SSL Certificate Checker
Inspect a domain's SSL/TLS certificate — issuer, expiry date, SANs, and chain of trust. Get warned about expiring certificates before they cause outages.
Checking certificate…
How to use the SSL Certificate Checker
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Enter a domain name (e.g., example.com).
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Review the certificate details.
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Check the expiry date and SANs.
Why check SSL certificates?
An expired SSL certificate breaks HTTPS and shows scary browser warnings that drive visitors away. This checker retrieves a domain's certificate chain, shows the issuer, validity window, subject alternative names, and key details — and warns you if the certificate is expiring soon. Great for monitoring your own domains before they break.
Key features
- Retrieves live SSL certificate chain for any domain
- Shows issuer, subject, validity, SANs, key algorithm
- Warns when certificates expire within 30 days
- Checks certificate chain of trust
Frequently asked questions
Does this connect to the domain?
Yes — it fetches the SSL certificate via a public SSL checker API. No credentials or sensitive data are sent.
What if the domain has no SSL?
It will report that no certificate was found. Most modern sites use HTTPS, so this is rare for production domains.
Is this a substitute for monitoring?
Use this for spot checks. For production monitoring, consider services like UptimeRobot or SSL Labs monitoring.