How do I use the SSL Checker tool?

Simply enter your domain name in the input box and click 'Check SSL Certificate'. Our tool will instantly analyze your SSL installation and provide a detailed report.

What does this SSL test verify?

The tool verifies certificate validity, expiration date, certificate chain (CA bundle), common name matching, and server protocol support.

Is this domain SSL check free?

Yes, our SSL checker tool is completely free for everyone. No registration or signup is required.

🔍 Professional SSL Diagnostics

SSL Checker Tool — Free SSL Certificate Checker & Online Analysis

Instantly verify your SSL certificate installation, check expiration dates, validate trust chains, and diagnose common SSL/TLS configuration errors.

Comprehensive SSL Certificate Analysis

Our SSL checker performs a comprehensive analysis of your SSL/TLS certificate installation:

Certificate Validity: Verifies that the certificate is currently valid and trusted
Expiration Date: Checks when your certificate expires and calculates days remaining
Certificate Chain: Validates the complete certificate chain to the root CA
Common Name Match: Ensures the certificate matches your domain name
Issuer Information: Displays who issued your SSL certificate
Key Strength: Verifies your encryption key size (2048-bit minimum recommended)
Protocol Support: Checks which TLS/SSL protocols are enabled
Server Type: Identifies your web server software

Step-by-Step: How to Check Your SSL Certificate

Enter Your Domain: Type your domain name (e.g., example.com) in the input field above
Click Check: Click the "Check SSL Certificate" button to start the analysis
Review Results: View detailed information about your SSL certificate installation
Fix Issues: If any problems are detected, follow our recommendations to fix them

Note: You don't need to include "https://" or "www" - just enter the domain name.

Common SSL Errors & How to Fix Them

❌ Certificate Expired

Cause: Your SSL certificate has passed its expiration date.

Fix: Renew your SSL certificate immediately. Most CAs send renewal reminders 30-90 days before expiration.

❌ Certificate Name Mismatch

Cause: The domain name doesn't match the certificate's Common Name or Subject Alternative Names.

Fix: Ensure you're using the correct certificate for your domain, or obtain a new certificate with the correct domain name.

❌ Incomplete Certificate Chain

Cause: Intermediate certificates are missing from your server configuration.

Fix: Install the complete certificate chain including all intermediate certificates provided by your CA.

❌ Self-Signed Certificate

Cause: The certificate is not issued by a trusted Certificate Authority.

Fix: Obtain a certificate from a trusted CA like Let's Encrypt (free), DigiCert, or Sectigo.

❌ Weak Cipher Suites

Cause: Your server is using outdated or weak encryption algorithms.

Fix: Update your server's SSL/TLS configuration to use modern cipher suites and disable weak protocols like SSLv3 and TLS 1.0. Refer to the OWASP TLS Cheat Sheet for best practices.

Frequently Asked Questions

How often should I check my SSL certificate?

We recommend checking your SSL certificate at least monthly, especially 30-60 days before expiration. Use our Bulk SSL Checker to monitor multiple domains.

What's the difference between SSL and TLS?

TLS (Transport Layer Security) is the successor to SSL (Secure Sockets Layer). Modern certificates use TLS, but the term "SSL certificate" is still commonly used. Our checker supports all TLS versions.

Why is my SSL certificate showing as untrusted?

This usually means the certificate chain is incomplete, the certificate is self-signed, or it's issued by an untrusted CA. Check the certificate chain and ensure all intermediate certificates are installed.

Can I check SSL certificates for mail servers?

Yes! Use our dedicated SMTP/IMAP SSL Checker for mail server certificates.