SSL Tools

SSL Certificate Checker

See whether a website's HTTPS certificate is valid, trusted by browsers and set up correctly - with every certificate detail in one report.

Not sure what to enter? Try an example: github.com

Free & instant No signup How to use FAQ

Type a domain to test the certificate its server presents right now. You get a clear verdict first, then the issuer, the names it covers, the chain and the remaining validity.

What does an SSL certificate checker show?

An SSL certificate checker connects to a website over HTTPS and reads the certificate the server presents: who issued it, which domain names it covers, when it became valid and when it expires. It tells you whether visitors will see a secure padlock or a browser warning, without having to open the site in every browser.

How to check a website's SSL certificate

Enter the domain, for example example.com, in the box above.
Click Check SSL.
Confirm the certificate is valid and that the domain you entered is listed among the names it covers.
Look at the expiry date - renew well before it, or make sure automatic renewal is working.
If the issuer is unknown or the certificate is self-signed, install a certificate from a trusted certificate authority.

Related checks

To see only how many days are left before expiry, use the SSL Expiry Checker.
To check which TLS protocol the server negotiates, try the TLS Version Checker.
To make sure visitors are actually sent to HTTPS, use the HTTPS Redirect Checker.

JustChecker monitors your SSL certificates automatically and alerts you before they expire - never lose customer trust to a browser warning again.

Frequently Asked Questions

Your browser may be using a cached connection or a different server than your visitors. This test opens a fresh connection from outside your network and shows exactly what a new visitor receives, including chain problems some browsers quietly work around.

The certificate was issued for different names than the one you entered - for example only www.example.com while visitors open example.com. Reissue the certificate so it lists every name people use, or redirect the uncovered name.

Yes. Let's Encrypt is trusted by every major browser, so a correctly installed free certificate passes this test exactly like a paid one.

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