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Archived by Robert Jung
Filename extension.arj
Uniform Type Identifier (UTI)public.archive.arj
Developed byRobert K. Jung
Latest release
Type of formatarchive format

ARJ (Archived by Robert Jung) is a software tool designed by Robert K. Jung for creating high-efficiency compressed file archives. ARJ is currently on version 2.86 for DOS and 3.20 for Microsoft Windows and supports 16-bit, 32-bit and 64-bit Intel architectures.[1]

ARJ was one of two mainstream[clarification needed] archivers for DOS and Windows during the early and mid-1990s, with PKZIP being its competition. Parts of ARJ were covered by U.S. Patent 5,140,321. Generally ARJ was less popular than PKZIP, but it did have a niche market during the BBS era and in the warez scene. This was largely due to ARJ's creation and handling of multi-volume archives (archives which are split into smaller files which are then suitable for dial-up transfers and floppy distribution) being more robust than that of PKZIP.

File format support in other software[edit]

ARJ compressed files with the Filename extension .arj can be unpacked with various tools other than the ARJ software. There exists a free software re-implementation of the tool. The software 7-Zip, Zipeg and WinRAR can also unpack .arj files.[2] For Mac there exists standalone utilities such as DeArj and UnArjMac.

See also[edit]


  1. ^ "ARJ Software News". 2014-06-07. Retrieved 2019-04-09.
  2. ^ "File Type: ARJ Compressed File Archive". Archived from the original on 2016-03-04. Retrieved 2019-04-08.

External links[edit]