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SSL Certificate Checker

Check SSL certificate details and expiration

Domain

How it works: This tool connects to the domain on port 443 via our server-side API to retrieve the actual SSL/TLS certificate details, including issuer, validity period, and protocol version.

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What is SSL Certificate Checker?

Free online SSL certificate checker to inspect SSL/TLS certificates for any website.

View the certificate issuer, subject, validity dates, expiration status, and certificate chain. Get warnings for expiring certificates, self-signed certificates, and other potential issues. Essential for monitoring website security and preventing certificate expiration outages. No signup required.

How to Use SSL Certificate Checker

1Enter a domain name (e.g., example.com)
2Click Check to inspect the SSL certificate
3View certificate details, issuer, and expiration
4Check for warnings about expiring or misconfigured certificates

Frequently Asked Questions

The issuer (Let's Encrypt, DigiCert, etc.), subject (domain name), valid from/to dates, days until expiration, protocol version, and whether the certificate chain is complete.

Check monthly at minimum. Set up monitoring for certificates expiring within 30 days. Let's Encrypt certificates expire every 90 days and should auto-renew, but it's good to verify.

The certificate chain connects your site's certificate to a trusted root certificate authority (CA) through intermediate certificates. A broken chain means browsers won't trust the certificate.

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