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How SSL Checker Works

Our free tool connects to your server, retrieves your SSL certificate, and delivers a comprehensive security report in seconds. Here's exactly what happens when you run a check.

1

Enter your domain

Type or paste any domain name into the SSL Checker. You can enter a bare domain like example.com, a full URL with https://, or a specific subdomain — we'll handle the rest. The tool works with any publicly accessible server that supports HTTPS.

2

We connect and retrieve the SSL certificate

Our tool establishes a TLS connection to your server on port 443, exactly the way a web browser would. During this handshake, we capture the full certificate chain — including your server certificate, any intermediate certificates, and the root certificate authority. We also record the negotiated TLS version and cipher suite.

3

Verify the certificate chain and TLS configuration

We validate the entire certificate chain to ensure each certificate is properly signed by the next in the chain, all the way up to a trusted root CA. We also check for expired or soon-to-expire certificates, weak signature algorithms, and test your server's TLS configuration for known vulnerabilities.

4

Get a complete security report

You'll receive a detailed report covering every aspect of your SSL/TLS setup. Where we find issues — like an expiring certificate, missing intermediate certificates, or outdated TLS versions — we provide specific, actionable recommendations to fix them.

What Gets Checked

SSL Checker evaluates six key areas of your server's SSL/TLS configuration. Here's what we analyse in each category.

Certificate Validity and Expiry

We verify that your SSL certificate is currently valid and report exactly when it expires. An expired certificate causes browsers to display security warnings, which drives visitors away and can hurt your search rankings. We show the issue date, expiry date, and how many days remain so you can plan renewals ahead of time.

Certificate Chain

A complete certificate chain is essential for browsers to trust your site. We trace the chain from your server's leaf certificate through any intermediate certificates up to the trusted root CA. Missing or misconfigured intermediates are one of the most common SSL issues — they cause trust errors on some devices even when your certificate itself is perfectly valid.

TLS Version (1.2 vs 1.3)

We test which TLS protocol versions your server supports. TLS 1.3 is the current standard, offering faster handshakes and stronger security. TLS 1.2 is still acceptable but older versions (TLS 1.0 and 1.1) are deprecated and should be disabled. We report exactly which versions your server accepts so you can ensure you're running a modern, secure configuration.

Cipher Suites

Cipher suites determine the encryption algorithms used to secure the connection. We check that your server uses strong ciphers and doesn't fall back to weak or deprecated ones. Modern best practice is to support only AEAD ciphers (like AES-GCM and ChaCha20-Poly1305) and disable older options like RC4 or 3DES.

HSTS Headers

HTTP Strict Transport Security (HSTS) tells browsers to always connect over HTTPS, preventing protocol downgrade attacks. We check whether your server sends the Strict-Transport-Security header, verify the max-age value, and report whether the includeSubDomains and preload directives are set. Proper HSTS configuration is a key defence against man-in-the-middle attacks.

Certificate Issuer and Type

We identify who issued your certificate (Let's Encrypt, DigiCert, Sectigo, etc.) and what type it is — Domain Validated (DV), Organisation Validated (OV), or Extended Validation (EV). We also check whether you're using a wildcard certificate, a multi-domain (SAN) certificate, and report the key size and signature algorithm for a complete picture of your certificate's security posture.

Ready to check your SSL certificate?

Enter any domain and get a complete SSL/TLS security report with actionable recommendations — completely free.

Check Your SSL Certificate →