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.CRT File Extension

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File TypeSecurity Certificate

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CategoryWeb Files


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.

More Information

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.

Programs that open CRT files
Microsoft Windows LogoWindows
Microsoft Internet Explorer
Mozilla Firefox
Google Chrome
Other Web browser
Mac OS X LogoMac
Apple Safari
Mozilla Firefox
Google Chrome
Other Web browser
Linux LogoLinux
Mozilla Firefox
Other Web browser
Updated 6/13/2009