Files with crt suffix can be usually found as Internet security certificates in a well known and supported standard.

There are 3 other file types using
the CRT file extension!

empty icon.crt - Commodore emulator data

empty icon.crt - Oracle terminal settings information

empty icon.crt - Unix Crontab data

Detailed description

Software that open crt file

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CRT file extension - Internet security certificate

What is crt file? How to open crt files?

File type specification:

Email attachment blocked file type icon Email attachment blocked file type

Internet related file type icon Internet related file type

crt file icon: crt filetype icon

File extension crt is frequently used for Internet security certificates. Server, web site transactions, logins, webmail and connections are usually secured with a SSL Certificate.

One of the most used certificate formats is the X.509v3. The standard known as ITU-T X.509 (formerly CCITT X.509) or ISO/IEC 9594-8, which was first published in 1988 as part of the X.500 Directory recommendations, defines a standard certificate format. The certificate format in the 1988 standard is called the version 1 (v1) format.

MIME types used:

The default software associated to open crt file:

Microsoft Edge icon

Microsoft Corporation logoMicrosoft Edge  Microsoft Windows software

Company or developer:
Microsoft Corporation

Microsoft Edge is web browser introduced in Microsoft Windows 10 operating system. It's fast and built for modern web applications and presentations. It allows users to simple share, reading and discover the Internet.

Safari icon

Apple, Inc. logoSafari  Apple macOS / Mac OS X software

Company or developer:
Apple, Inc.

Safari is the default web browser integrated to Apple Mac OS X since version 10.3 "Panther". It is also used in iOS devices like iPads and IPhones.

Help how to open:

Opening a certificate usually prompts you to install it to your system. Be careful when installing unknown certificates.

How to convert:

Certificates are not meant ot be converted to anythin else.

File identification strings:

HEX code: 42 61 67 20 41 74 74 72 69 62 75 74 65 73 0A
ASCII code: Bag Attributes

List of software applications associated to the .crt file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open crt file, edit crt file, convert crt file, view crt file, play crt file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting crt files.

Software that import crt file - Internet security certificate

Programs supporting the exension crt on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for import crt file action.

Microsoft Windows:

Main software associated with crt file by default:
Microsoft Edge small icon Microsoft Edge
Other suggested software:
Opera browser small icon Opera browser
Firefox small icon Firefox
Google Chrome small icon Google Chrome
Safari for Microsoft Windows small icon Safari for Microsoft Windows

Apple macOS / Mac OS X:

Main software associated with crt file by default:
Safari small icon Safari
Other suggested software:
Opera browser for Mac small icon Opera browser for Mac
Firefox for Mac small icon Firefox for Mac
Google Chrome for Mac small icon Google Chrome for Mac

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