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SSL Checker

Inspect SSL/TLS certificate details, validity, issuer, and expiration date.

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About this tool: SSL Checker

Inspect SSL/TLS certificate details, validity, issuer, and expiration date.

The SSL Checker inspects the X.509 public key certificate of any secure HTTPS web server. It verifies the Certificate Authority (CA) trust chain, encryption algorithms (RSA/ECC), Subject Alternative Names (SANs), and exact certificate expiration dates.

Belangrijkste Toepassingen & Voordelen

  • Prevent visitor-facing security warnings by tracking upcoming expiration dates.
  • Confirm wildcard certificates (*.domain.com) cover required subdomains.
  • Validate support for modern TLS 1.2 and TLS 1.3 cryptographic protocols.
  • Retrieve SHA-256 fingerprints for certificate pinning and audits.
Handige Tip & Best Practice: Modern browsers enforce a maximum certificate validity of 398 days. Implement automated ACME / Let's Encrypt renewal to eliminate certificate expiration risks.

This online diagnostic utility is powered by ToolPing to provide fast, reliable, and secure network analytics for sysadmins and developers.

Frequently Asked Questions (FAQ)

How do I verify an SSL/TLS Certificate?

Enter the domain name (e.g. cloudflare.com) and click "Check Certificate". The tool retrieves issuer info, valid dates, cipher bits, and SHA-256 fingerprints.

Why is an active SSL certificate critical?

SSL/TLS encrypts sensitive data (passwords, payment details) between visitors and the server, prevents eavesdropping, and avoids browser security warnings.

What happens when an SSL certificate expires?

Modern browsers block access with a prominent security warning ("Your connection is not private"), which repels users.