Question 1

How does this tool check certificates?

Accepted Answer

The tool queries Certificate Transparency logs to find the most recent certificate issued for the domain. This provides certificate metadata without needing a direct TLS connection from the browser.

Question 2

Is this real-time?

Accepted Answer

It shows the most recently issued certificate from public CT logs. For real-time TLS connection checks, use tools like openssl s_client or a server-side checker.

Question 3

Why does it say 'expiring soon'?

Accepted Answer

Certificates with 30 days or less remaining are flagged as expiring soon. This gives you time to renew before users see browser warnings.

Question 4

Can I check internal/private domains?

Accepted Answer

No. This tool only works with publicly-issued certificates logged in Certificate Transparency. Internal CA certificates are not in public CT logs.

SSL Certificate Checker

About this tool

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