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SSL Checker

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About SSL Checker

SSL Checker inspects the TLS/SSL certificate installed on any domain to verify its validity, expiration date, issuer, and chain of trust. It helps website owners, DevOps engineers, and security teams catch certificate problems before they cause browser warnings or service outages. Catch expiring certificates, misconfigured chains, and protocol weaknesses in seconds.

Key Features

  • Displays certificate subject, issuer, and full chain of trust details
  • Shows exact expiration date with a countdown of remaining days
  • Detects common issues like expired certificates, self-signed certs, and hostname mismatches
  • Reports supported TLS protocol versions and cipher suites
  • Checks for certificate transparency log inclusion
  • Color-coded status indicators for quick pass or fail assessment

How to Use SSL Checker

  1. 1

    Enter the domain name

    Type the domain you want to check, such as example.com, into the input field. You do not need to include https:// or a port number.

  2. 2

    Run the check

    Click the Check button to connect to the server and retrieve its SSL certificate details.

  3. 3

    Review certificate details

    Examine the issuer, subject, validity dates, and serial number. Verify that the certificate matches the intended domain and has not expired.

  4. 4

    Inspect the certificate chain

    Review the full chain of trust from the leaf certificate through intermediates to the root CA. A broken chain causes trust errors in browsers.

  5. 5

    Check protocol and cipher support

    Review which TLS versions and cipher suites the server supports to ensure deprecated protocols like TLS 1.0 and 1.1 are disabled.

Common Use Cases

Pre-Expiry Monitoring

Regularly check your certificates to catch upcoming expirations before they trigger browser security warnings and disrupt traffic to your site.

Post-Deployment Validation

After installing or renewing a certificate, verify that the correct certificate is served, the chain is complete, and the hostname matches.

Third-Party Vendor Auditing

Inspect SSL configurations of SaaS vendors, payment processors, and API providers your organization depends on to ensure they meet your security requirements.

Compliance Verification

Confirm that your servers meet PCI DSS, HIPAA, or SOC 2 requirements for TLS version minimums and strong cipher suite configurations.

Why Use Our SSL Checker

This SSL Checker performs a real TLS handshake and inspects the entire certificate chain, supported protocols, and cipher suites in one pass — with color-coded pass/fail indicators for instant assessment. It shows the exact days until expiration so you can catch renewals before they cause outages. No account needed, just enter a domain and get a comprehensive security report in seconds.

Certificate Checks Leave No Trace

The domains you inspect are not recorded or shared with third parties. SSL certificate details are fetched via a standard TLS handshake and displayed only to you. This means you can audit your own or a vendor's certificate posture without alerting anyone or creating a queryable history of your security assessments.

Frequently Asked Questions

What does it mean if the certificate chain is incomplete?
An incomplete chain means the server is not sending one or more intermediate certificates. Most modern browsers can fetch missing intermediates automatically, but older clients and API consumers may reject the connection with a trust error.
How often should I check my SSL certificates?
At minimum, check monthly or set up automated monitoring. If you use short-lived certificates from services like Let's Encrypt that expire every 90 days, more frequent checks help catch renewal failures early.
Does this tool test the full TLS handshake?
Yes. The checker initiates an actual TLS connection to the server, which means it verifies not just the certificate contents but also the server's protocol support, cipher negotiation, and chain delivery.

Last updated: April 6, 2026