SSL Certificate Checker

Is your SSL certificate configured correctly? Check for expired certificates, weak ciphers, mixed content, and TLS misconfigurations — free and instant.

🔍

✓ No signup required · ✓ Fast results · ✓ 100% free basic scan

Why SSL/TLS Configuration Matters

An SSL/TLS certificate encrypts the connection between your website and its visitors. But simply having a certificate isn't enough — misconfigured SSL causes 23% of all security warnings that drive visitors away.

What We Check

Certificate Validity — Expiration date, issuer trust chain, domain match
Protocol Versions — TLS 1.2/1.3 support, deprecated SSL 3.0/TLS 1.0/1.1 disabled
Cipher Strength — Strong cipher suites, no RC4, DES, or NULL ciphers
HSTS Configuration — HTTP Strict Transport Security header with proper max-age
Mixed Content — No HTTP resources loaded on HTTPS pages
Certificate Transparency — CT logs for public accountability

Frequently Asked Questions

How do I check if my SSL certificate is valid?

Enter your website URL in VulnScan. We'll verify the certificate chain, check expiration, test cipher suites, and confirm protocol support — all in seconds.

What happens if my SSL certificate expires?

Visitors see a scary browser warning and most will leave immediately. Google also penalizes sites with invalid SSL in search rankings.

Is a free SSL certificate (Let's Encrypt) as secure as paid ones?

Technically yes — the encryption is identical. Paid certificates (EV/OV) add organization verification but don't provide stronger encryption.

Every day you wait is another day hackers have the advantage

Scan your website now — free, instant, no signup.