SSL Chain & Installation Checker
Check whether your certificate is installed with its complete chain — the most common cause of "works for me but not for them" errors.
Type a website above and press Check. You'll get the status and its exact expiry date, with the technical details a step away.
How it works
1
Enter a website
Just the hostname, like example.com. No http:// needed.
2
We check it live
We connect to the site and read its certificate, right now.
3
Get a plain answer
Valid or not, and the exact date it expires.
Common questions
- What is a certificate chain, and why does it matter?
- Your certificate is signed by an intermediate, which is signed by a trusted root. Your server must send the leaf AND the intermediate(s) so every visitor can build that path to a root they trust.
- Why does my site work in one browser but not another?
- Usually a missing intermediate. Some clients cache or fetch it and appear fine, while others fail. Reinstall the full chain bundle (leaf + intermediates) so it works everywhere.
- Is the chain checker free?
- Yes, with no signup. SSLCanary can also keep watching the chain and warn you if it breaks — add your sites to a free account.