Check any site's SSL certificate.
Verify validity, expiry, issuer, chain, protocols and hostname coverage — instantly.
Validity & expiry
Whether the certificate is trusted right now, who issued it, when it expires and if it covers the hostname you typed.
Chain & trust
The full leaf → intermediate → root chain the server sends, so you can spot missing intermediates and self-signed certificates.
Protocols & ciphers
Negotiated TLS version and cipher suite, TLS 1.2 / 1.3 support, key strength and signature algorithm — summed up in a grade.
SSL, explained.
A few answers to the questions we hear most about certificates, trust and renewals.
Look up who owns a domainCheck if a website is downHosting with free SSL includedTalk to our team 24/7An SSL certificate (technically a TLS certificate) is a small file installed on a web server that does two things: it proves the server really is the site you asked for, and it enables the encrypted HTTPS connection your browser shows with a padlock. It is issued by a certificate authority (CA) such as Let’s Encrypt, Google Trust Services or Sectigo after they verify control of the domain, and it lists the hostnames it covers, who issued it and the dates between which it is valid.