.crt

File Type Generic IconSecurity Certificate
File Format Standard
Usage Referenced by an application; not meant to be opened manually
Rank ★ ★ ★  Common
Description

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.

Open With
Windows

IconMicrosoft Internet Explorer

IconMozilla Firefox

IconGoogle Chrome

macOS

IconApple Safari

IconMozilla Firefox

IconGoogle Chrome

Unix

IconMozilla Firefox

IconOther Web browser

Updated 2007
space