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CRT File

What are CRT files and how to open them

Are you having problems opening a CRT file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CRT files.

What is a CRT file?

CRT files have multiple uses, and Security Certificate is one of them. Read more about the other uses further down the page.

Security Certificate

A .crt file is a digital certificate used to establish a secure connection between web servers and clients, such as web browsers. Certificates contain information about the identity of the server and organization, as well as a public key that encrypts data transmitted between server and client.

When a client connects to a server, the server sends its certificate to the client which verifies its authenticity against a list of trusted certificate authorities (CA). If the certificate is deemed authentic, it establishes a secure connection with the server using the public key contained in the certificate.

Additionally, certificates are used to authenticate individuals or organizations when accessing certain resources or services online.

Overall, .crt files play an essential role in online security by verifying trust and protecting data transmitted over the internet.

How to open CRT files

Important: Different programs may use files with the CRT file extension for different purposes, so unless you are sure which format your CRT file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested three different CRT openers which you will find listed below.

Last updated: February 24, 2023

All known file formats using extension .CRT

While Security Certificate is a popular type of CRT-file, we know of 2 different uses of the .CRT file extension. Different software may use files with the same extension for different types of data.

C64 Cartridge Dump

These CRT files are cartridge image files that contain a copy of the ROM code used in hardware cartridges for the Commodore 64 home computer released in 1982. Cartridges were used to extend the features of the Commodore 64 and to distribute games. The images can be run by Commodore 64 emulators that enable you to run old Commodore 64 software on your modern PC.

CRT opener for Windows

We have identified one CRT opener that is compatible with this specific type of CRT file.


Various apps that use files with this extension

These apps are known to open certain types of CRT files. Remember, different programs may use CRT files for different purposes, so you may need to try out a few of them to be able to open your specific file.

WinDS PRO AppsWinDS PRO AppsUser submitted
DigitalSign ProfessionalDigitalSign ProfessionalUser submitted
DigitalSign ReaderDigitalSign ReaderUser submitted

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CRT file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.