ARJ ruled DOS BBS archives before ZIP won — a solid-compression container whose files still surface in retro software collections.
Typical use: Extract ARJ archives from legacy software collections and repackage the contents as ZIP.
About the ARJ format
ARJ was the power-user archiver of the DOS era — solid compression (later files reference earlier ones for better ratios), multi-volume spanning and self-extracting executables, years before ZIP caught up. Software collections from the early 1990s are full of .arj volumes.
7-Zip's decoder still reads ARJ, so those collections remain extractable: unpack in the browser and repackage into ZIP for anything modern.
Strengths
- ✓ Solid compression was ahead of its time
- ✓ Multi-volume and SFX support
- ✓ Still readable via 7-Zip
Limitations
- ✗ Abandoned format — no modern writers
- ✗ Windows-125x filenames can mojibake
- ✗ DOS-era paths (8.3 remnants)
- Structure
- Header + solid-compressed blocks
- Types / schema
- Binary container
- Compatibility
- 7-Zip, ARJ, WinRAR (read)
- Best for
- DOS-era software archives
Convert ARJ to…
12 direct directions, sorted A–Z; 🔥 marks popular targets.
Frequently asked questions
What is a ARJ file?
ARJ ruled DOS BBS archives before ZIP won — a solid-compression container whose files still surface in retro software collections.
How do I convert ARJ files online?
Pick a target format from the "Convert ARJ to…" list below, drop your file and hit convert. Everything runs in your browser — no install, no upload, no watermark, no limits.
Is it safe to convert ARJ files here?
Yes. Every conversion is performed by your own device inside the browser — files never leave for a server, and the page keeps working even offline.
Which formats can ARJ convert to?
This page lists all 12 directions across documents, images, audio, video, spreadsheets and archives — each one is its own free converter page.