SSL checker: is the certificate valid?
Our server reads the certificate like a browser and tells you if a warning would appear, and why.
Free, no signup, usually a few seconds.
You will see: valid or not, the expiry date, the issuer and the names covered.
Common questions
The certificate has expired. What now?
Renew it with whoever issued it: on most hosting platforms that is one button, or an automatic renewal that failed. After renewing, check here again. Until then every visitor sees a red warning.
The certificate does not match the site name. Why?
A certificate covers specific names, for example example.com and www.example.com. If a visitor opens another name, such as shop.example.com, and it is not on the list, the browser warns. Fix it with a certificate that covers that name too, or a wildcard certificate.
Is Let's Encrypt fine?
Yes. A free Let's Encrypt certificate is exactly as secure as a paid one. The only difference is the 90-day validity, which needs automatic renewal.
Is there a limit?
Up to 20 checks an hour from one connection, with no account. A result is kept for ten minutes, so checking the same address twice returns the saved one.