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DevsToolkit

SSL Certificate Checker

Check SSL/TLS certificate validity and expiration dates

Check Domain

Enter a domain name to check its SSL certificate

Quick examples:

About SSL/TLS Certificates

SSL (Secure Sockets Layer) and TLS (Transport Layer Security) certificates encrypt data transmitted between web servers and browsers, ensuring secure communication.

Key Features:

  • Data encryption in transit
  • Server authentication
  • Data integrity verification
  • Trust indicators (padlock icon)

Certificate Renewal

SSL certificates need to be renewed periodically. Most certificates are valid for 1 year, though some can be issued for up to 2 years.

Renewal Timeline:

  • 90+ days: Certificate is healthy
  • 30-90 days: Plan for renewal
  • 0-30 days: Renew immediately
  • Expired: Site will show security warning
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Note About SSL Checking

This tool performs a basic SSL check by attempting to connect to the domain over HTTPS. For detailed certificate information including the full chain, algorithms, and advanced security features, this would typically require a server-side implementation or use of external APIs like SSL Labs.

The tool will verify that:

  • Domain has a valid SSL certificate
  • Certificate is trusted by browsers
  • Certificate hasn't expired
  • Connection can be established over HTTPS