Check SSL Certificate
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SSL Certificate Details
Ensure Your Website Security with SSL
Verify your SSL certificate is valid, properly configured, and not about to expire
SSL/TLS certificates encrypt the connection between your website and visitors, protecting sensitive data. An expired or misconfigured certificate causes browser warnings that drive visitors away. Our checker verifies your certificate's validity, expiry, and configuration.
What We Check
Expiry Check
Shows exact expiry date and days remaining with visual alerts.
Certificate Details
Displays issuer, subject, serial number, and signature algorithm.
SAN Verification
Lists all Subject Alternative Names covered by the certificate.
Domain Match
Verifies the certificate covers the checked domain name.
Best Practices
- Set up automated renewal (Let's Encrypt auto-renews every 90 days).
- Monitor certificates that expire within 30 days.
- Use 2048-bit or higher RSA keys for security.
- Ensure your certificate covers all subdomains you use.
- Test your SSL configuration with multiple tools.
- Keep your server's SSL/TLS configuration up to date.
Frequently Asked Questions
What happens when SSL expires?
Browsers show a prominent security warning, telling visitors the site is not secure. This dramatically reduces trust and traffic. Most browsers block access by default.
How often should I check my SSL?
Check monthly, or set up automated monitoring. Free certificates (like Let's Encrypt) expire every 90 days and should auto-renew.
What is SAN?
Subject Alternative Name (SAN) lists all domain names covered by a single certificate. For example, a SAN certificate might cover example.com, www.example.com, and api.example.com.