.CRT File Extension
File TypeSecurity Certificate
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
Certificate used by secure websites (beginning with "https://") to verify their authenticity; distributed by companies such as Verisign and Thawte.
Certificate files are automatically recognized by Web browsers when a user visits a secure site. The information stored in the certificate can be viewed by clicking the lock icon within the browser window.