SSL Certificate Checker

Analyze your website's security posture. Verify SSL/TLS validity, chain of trust, and configuration in real-time.

How This SSL Tool Works

Our SSL Checker performs a live 'handshake' with your server, mimicking a real browser connection. It retrieves the public certificate and analyzes the entire chain of trust, expiration dates, and cryptographic strength to ensure your visitors are protected.

Why Regular SSL Checks Matter

  • Prevent downtime by catching expiration dates early
  • Ensure mobile compatibility by verifying the certificate chain
  • Boost SEO rankings by maintaining a valid HTTPS signal
  • Detect insecure protocols (TLS 1.0/1.1) that hackers exploit
  • Verify that your redirect from HTTP to HTTPS is working
  • Confirm that your 'Subject Alternative Names' (SANs) cover all subdomains

Step-by-Step Verification

1

Enter your hostname (e.g., example.com) in the input field above.

2

Click 'Check SSL' to initiate the server handshake.

3

Review the 'Expiration' card to see how many days are left.

4

Check the 'Chain Status' to ensure no intermediate certificates are missing.

5

Examine the 'Protocol' section to ensure you are using TLS 1.2 or 1.3.

Comprehensive Analysis Features

Expiration Countdown Timer
Root & Intermediate Chain Validation
Certificate Authority (Issuer) Identification
2048-bit / 4096-bit Key Strength Check
TLS Protocol Version Detection
Subject Alternative Name (SAN) Listing
Visual Pass/Fail Indicators

Understanding SSL/TLS Security

Secure Sockets Layer (SSL) and Transport Layer Security (TLS) are the standard protocols for establishing authenticated and encrypted links between networked computers. When you use our SSL Checker, you are verifying the integrity of this digital handshake.

The SSL Handshake Process

A valid certificate is required for the handshake to succeed. If the certificate is expired or the chain is broken, the handshake fails, and the user sees a security warning.

Why the "Chain of Trust" Fails

One of the most common issues our tool detects is a broken certificate chain. An SSL certificate is not a single file; it is a link in a chain.

  • Root Certificate: Pre-installed in browsers/OS. Trusted implicitly.
  • Intermediate Certificate: Links your certificate to the Root. This is often missing in server configs.
  • Server (Leaf) Certificate: The one you bought for your domain.

Impact on SEO and Rankings

Since 2014, Google has used HTTPS as a ranking signal. Sites with invalid SSL certificates are penalized. Furthermore, modern browsers like Chrome and Safari display full-screen "Not Secure" warnings for invalid certs, resulting in a bounce rate of nearly 100%. Regular monitoring using an SSL Checker is critical for maintaining your search engine visibility.