🔐SSL Certificate Checker

Check SSL certificate details, expiry date, and chain validity.

Enter a hostname to check its SSL certificate.

About SSL Certificate Checker

SSL Certificate Checker retrieves and displays the full SSL/TLS certificate details for any domain — including the common name, issuer, validity period, expiry date, Subject Alternative Names, and certificate chain. Use it to monitor certificate expiry before it causes unexpected downtime.

How to Use SSL Certificate Checker

1
Enter the domain name
Type the domain or subdomain you want to check (e.g., example.com or www.example.com).
2
Run the check
Click 'Check SSL' to retrieve the certificate information for that domain.
3
Review certificate details
View the certificate issuer, valid date range, expiry date, and whether the full certificate chain is valid.

Common Use Cases

Monitoring SSL certificate expiry dates to prevent unexpected lapses
Verifying that a newly installed SSL certificate is correctly configured
Checking whether a wildcard certificate covers a specific subdomain
Diagnosing SSL warnings by inspecting the certificate chain

Frequently Asked Questions

How do I check when my SSL certificate expires?

Enter your domain name and click 'Check'. The tool displays the 'Valid Until' date along with a warning if the certificate expires within the next 30 days.

What does it mean if the certificate chain is invalid?

An invalid chain usually means an intermediate certificate is missing or misconfigured on the server. This can cause browser security warnings even if the leaf certificate itself is valid.

Can I check SSL certificates for subdomains?

Yes — enter the full subdomain (e.g., app.example.com) to check its specific certificate, which may differ from the root domain's certificate.

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