Validate an SSL Certificate Online
Validate a domain's SSL certificate — confirm it is trusted, covers the hostname, and is currently valid.
What makes an SSL certificate valid
A valid certificate is issued by a trusted certificate authority, is within its valid-from and valid-to dates, chains correctly to a trusted root, and covers the hostname being visited. Our validator checks each of these against a live connection.
Why validation fails
Validation commonly fails because the certificate has expired, is self-signed, is missing intermediate certificates, or does not list the hostname in its Subject Alternative Names. Any of these will cause browsers to reject the connection.
Frequently asked questions
Does validation check the full chain of trust?
Yes. We report whether the certificate chains to a trusted root, not just whether dates are valid.
Can I validate a certificate before going live?
As long as the domain is publicly reachable over HTTPS, you can validate it any time — and monitor it afterwards for free.
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