Files with JAR 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 file

empty icon.j - Java source code

Detailed description

Software that works with j file extension

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J file - JAR archive file

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. Not to be confused with Java JAR.

The default software associated to j file type:

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:

As far as we know, this .j file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

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 ableto perform the specified software action, such as opening, editing or converting j files.

  • Open j file
  • Create j file
  • Extract j file

Software that open j file - JAR archive file

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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