View source for ARJ

{{Short description|Compression software}}
{{About|the compressed file format|other uses|ARJ (disambiguation)}}
{{Infobox file format
| name                   = Archived by Robert Jung
| logo                   = 
| icon                   = 
| iconcaption            = 
| screenshot             = ARJ v2.50 command options 01.png
| caption                = 
| extension              = .arj
| mime                   = 
| type code              = 
| uniform type           = public.archive.arj
| conforms to            = 
| magic                  = 
| owner                  = Robert K. Jung
| released               = {{Start date and age|1991}}
| latest release version = 2.86 ([[MS-DOS]]), 3.31 ([[Microsoft Windows|Windows]])<ref name="history" />
| latest release date    = {{Start date and age|2025|11|03}}<ref name="history" />
| genre                  = [[archive format]]
| container for          = 
| contained by           = 
| extended from          = 
| extended to            = 
| standard               = 
| open                   = Yes <small>(patent expired)</small>
| url                    = arj32.com
}}
'''ARJ''' ('''A'''rchived by '''R'''obert '''J'''ung) is a software tool designed in 1991 by Robert K. Jung for creating high-efficiency [[data compression|compressed file]] archives. ARJ is currently on version 2.86 for [[MS-DOS]] and 3.31 for [[Microsoft Windows]] and supports 16-bit, 32-bit and 64-bit [[Intel]] architectures.<ref name="history">{{cite web|url=http://arj32.com|title=ARJ Software|date=2025-11-16|access-date=2025-11-16}}</ref>

ARJ was one of many file compression utilities for [[MS-DOS]] and [[Microsoft Windows]] during the early and mid-1990s. Parts of ARJ were covered by {{US patent|5140321}} (expired). ARJ is well-documented and includes over 150 command line switches.

== File format support in other software ==
ARJ archives can be unpacked with various tools other than the ARJ software. There exists a free software re-implementation of the tool. A number of software utilities, including [[7-Zip]], [[Total Commander]], [[Zipeg]], and [[WinRAR]] can also unpack .arj files.<ref>{{Cite web |url=http://extensiopedia.com/extension/.arj |title=File Type: ARJ Compressed File Archive|access-date=2019-04-08 |archive-url=https://web.archive.org/web/20160304033842/http://extensiopedia.com/extension/.arj |archive-date=2016-03-04 |url-status=usurped}}</ref> For macOS, standalone utilities, such as DeArj and UnArjMac, are available.

== See also ==
*[[List of archive formats]]
*[[Comparison of file archivers]]

== References ==
{{Reflist}}

== External links ==
* http://arj32.com 
* [{{Wikidata URL|P=P856|from=Q67172516}} {{wikidata|label|Q67172516}}]

{{Compression software}}{{Archive formats}}
[[Category:Archive formats]]
[[Category:File archivers]]
[[Category:Windows compression software]]
[[Category:Data compression software]]
[[Category:Data compression]]

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