.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.
What is a CRT file?
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.