SSL Certificate Checker
Check any website’s SSL/TLS certificate: validity, days until expiry, issuer, covered domains, chain and TLS version.
About the SSL Certificate Checker
An expired or mismatched SSL certificate shows visitors a scary “Your connection is not private” warning and can cost you traffic and sales. This checker connects to the server the way a browser does and reports whether the certificate is trusted, how many days are left, who issued it, which domain names it covers, the TLS version and cipher, and every certificate in the chain.
Use it after installing a new certificate, before a renewal deadline, or when a visitor reports a security warning. A missing intermediate certificate, for example, works in some browsers but fails on many phones; the chain table makes that easy to spot.
How to use the SSL Certificate Checker
- 1Enter a website address such as example.com.
- 2Press Check to open a secure connection to the server.
- 3See whether the certificate is trusted and when it expires.
- 4Review the covered domains and the full certificate chain.
Key features
Frequently asked questions
How early should I renew?
Free certificates such as Let’s Encrypt last 90 days and usually renew automatically about 30 days before expiry. If fewer than 15 days remain, check that auto-renewal is working.
What does “unable to verify the first certificate” mean?
The server is not sending the intermediate certificate. Install the full chain (often called fullchain.pem or the CA bundle) on your server.
Is the SSL Certificate Checker free?
Yes. The SSL Certificate Checker on Apex Tool Station is 100% free with no signup and no watermark. Browser tools have no usage limits.
Do you store the websites or domains I check?
No. Our server makes the request, sends the result back to your browser and keeps nothing. Private and internal network addresses are blocked for safety.
Does it work on mobile?
Yes. The tool works on any modern browser on Android, iPhone, Windows, Mac and Linux.