ARJ

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A compression program for backup archiving from ARJ Software, Inc., Norwood, MA (www.arjsoftware.com). Introduced in the early 1990s and created by Robert Jung (the RJ in ARJ), ARJ never achieved the popularity of PKZIP, although it is considered a worthy competitor. See JAR.

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ARJ

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This article is about the compressed file format. For other uses, see ARJ (disambiguation).

Filename extension	`.arj`
Uniform Type Identifier	public.archive.arj
Developed by	Robert K. Jung
Type of format	archive 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 3.2 for Windows and supports 16-bit and 32-bit Intel architectures.

ARJ [1] was one of two mainstream archivers for DOS and Windows during the early and mid-90s, 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 enjoy 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 PKZIP's.

In recent times, other alternatives to the ZIP archive, such as RAR or 7zip have surpassed ARJ in market share; the lack of an official graphical version may have contributed to ARJ's decline.

External links

ARJ Software Inc. (proprietary version)
Open Source version of the ARJ archiver

Data compression software

Archivers
with compression
(comparison)

Free software	7-Zip Ark File Roller FreeArc Info-ZIP KGB Archiver PAQ PeaZip The Unarchiver (decompression only) tar UPX Xarchiver Zipeg

Freeware	Filzip IZArc LHA StuffIt Expander (decompression only) TUGZip ZipGenius Bandizip

Commercial	ARC ALZip Archive Utility ARJ BetterZip JAR MacBinary PKZIP/SecureZIP PowerArchiver StuffIt WinAce WinRAR WinZip

Lossless data compression^*

Free software	bzip2 compress gzip lzip lzop rzip xz

Audio compression
(comparison)

Lossy	Freeware Advanced Audio Coder (FAAC) Helix DNA Producer l3enc LAME TooLAME libavcodec libcelt libspeex Musepack libvorbis Windows Media Encoder

Lossless	ALAC FLAC libavcodec Monkey's Audio mp4als OptimFROG Shorten TTA (True Audio) WavPack

Video compression
(comparison)

Lossy

MPEG-4 ASP	3ivx DivX Nero Digital FFmpeg HDX4 Xvid

H.264/MPEG-4 AVC	CoreAVC Blu-code DivX FFmpeg Nero Digital QuickTime x264

Others	CineForm Cinepak DNxHD Helix DNA Producer Indeo libavcodec Schrödinger (Dirac) SBC Sorenson VP7 libtheora libvpx Windows Media Encoder

Lossless

^* Non-archiving
See also: compression methods and compression formats

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