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Radar Tools

SSL Checker

Verify TLS certificates and expiration dates.

Inspect any domain's SSL/TLS certificate to check its validity, issuer, expiration date, and Subject Alternative Names. Keep your VPS and web services properly secured with valid certificates.

SSL Certificate Check

/tools/ssl-checker

How It Works

Our server opens an SSL/TLS connection to port 443 of the target domain, captures the peer certificate, and parses it using OpenSSL. The certificate details including issuer, validity period, SANs, and signature algorithm are extracted and returned.

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Frequently Asked Questions

It connects to port 443, retrieves the SSL certificate, and parses the issuer, validity dates, Subject Alternative Names, and signature algorithm.
Check after any certificate renewal or change. If using Let's Encrypt with auto-renewal, a monthly check ensures the automation is working.
Renew it immediately using your certificate provider or certbot. Expired certificates cause browser warnings and break HTTPS trust.