TLS certificate analysis

For web teams checking a launch or tracing a fault, this test provides an immediate point of reference. Review the issuer, covered domains and expiry of a TLS certificate.

Review the issuer, covered domains and expiry of a TLS certificate. The result organizes the useful evidence so you can focus the diagnosis.

How to use

Enter the domain you want to inspect, using a public host name without unnecessary paths or query parameters.
Start the test so that the request is made by the YOORfree server to the target site.
Read the issuer, covered domains and expiry date shown in the result.
Compare those details with the host name your visitors use, then look for missing coverage or an upcoming renewal date.

Example

A site owner preparing a shop launch wants to confirm that the certificate covers both the main address and the planned subdomain. They enter the domain, run the test and review the issuer, covered domains and expiry to catch a problem early.

Limits and formats

The test reflects the certificate presented at the moment it runs; a later change will not appear until you run another analysis.
It is not a full security audit and does not prove that the site is free from vulnerabilities.
A misspelled or unreachable domain can produce an error, so check the name before interpreting the result.
Coverage for a subdomain depends on the certificate and the site configuration, not only on the main domain.

Where processing happens

The domain you enter is sent to the YOORfree server. That server queries the target site to retrieve the TLS certificate details and returns the result to you. No file is uploaded during this check.

Frequently asked questions

Can I check a certificate before a site goes live?

Yes, if the domain is already reachable publicly on the secure port. If the site is only available on an internal network, a remote test may fail or may not see the configuration your users will get.

What does an expired certificate in the result mean?

It means the known validity period had already ended when the test ran. Browsers may then show a warning, and the certificate usually needs to be renewed or replaced.

Does the result cover every subdomain?

No. You must check the list of domains covered by the certificate. A subdomain can be missing even when the main domain is correctly protected.