ARJ (Archived by Robert Jung) is a software tool designed in 1991 by Robert K. Jung for creating high-efficiency 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.
| Archived by Robert Jung | |
|---|---|
| Filename extension | .arj |
| Uniform Type Identifier (UTI) | public.archive.arj |
| Developed by | Robert K. Jung |
| Initial release | 1991 |
| Latest release | 2.86 (MS-DOS), 3.31 (Windows) November 3, 2025 |
| Type of format | archive format |
| Open format? | Yes (patent expired) |
| Website | arj32.com |
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 U.S. patent 5,140,321 (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. For macOS, standalone utilities, such as DeArj and UnArjMac, are available.
See also
- List of archive formats
- Comparison of file archivers
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