Certificate Info is a Chrome extension developed by blupig.net. This free tool displays the validation level, expiration date, and other relevant information about the SSL/TLS server certificate of the websites you visit. It aims to assist users in identifying the identity of the server they are connecting to securely.

The extension has some limitations due to Chrome's extension API. It fetches and processes validation info through a backend API based on the hostname you visit, not the full URL. Additionally, it only provides information for hosts accessible from the public network and should be used as a reference rather than relied upon for certificate validation.