Files with jar file extension might also be found as compressed archives created using the JAR program. 

There are 2 other file types using
the J file extension!

j icon.j - JPEG/JFIF image

empty icon.j - Java source code

Detailed description

Software that open j file

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J file extension - JAR archive

What is j file? How to open j files?

File type specification:

Archive and compressed file type icon Archive and compressed file type

The j file extension is also related to Java and used by JAR compression software for its default archive format, developed by ARJ Software. Not to be confused with Java JAR.

Updated: May 27, 2019

The default software associated to open j file:

ARJ Software, Inc. logoJAR  Microsoft Windows software

Company or developer:
ARJ Software, Inc.

JAR is a PC file archiver that compresses files into a disk-space-saving archive using state of the art archiver technology. It is fast, powerful, reliable, and has a rich set of features (see below).

Help how to open:

You can decompress these files using JAR program.

How to convert:

Probably cannot be converted to anything else.

List of software applications associated to the .j 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 j file, edit j file, convert j file, view j file, play j 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 j files.

Software that open j file - JAR archive

Programs supporting the exension j on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about JAR for open j file action.

Microsoft Windows:

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