Quick answer: A RAR file is a compressed archive made with WinRAR, similar to ZIP but a proprietary format that some systems cannot open without extra software.
RAR file (Roshal Archive) explained
A RAR file is a compressed archive, like a ZIP, made with the WinRAR program. The format was created by Eugene Roshal. It can compress a bit better than classic ZIP, split archives into parts and add recovery data to repair minor damage.
Only WinRAR can create RAR files, but many tools can open them. Recent versions of Windows 11 can extract RAR in File Explorer, while macOS and older Windows versions usually need a separate app.
If you are choosing a format for someone else, ZIP is the friendlier option. If you received a RAR, an online extractor can open it without installing anything.
ZIP vs RAR vs 7z
| ZIP | RAR | 7z | |
|---|---|---|---|
| Create it | Built into Windows and macOS | WinRAR only | Free 7-Zip and other tools |
| Open it | Built in everywhere | Recent Windows 11; other systems need an app | Recent Windows 11; other systems need an app |
| Strong encryption | AES-256 with some tools | Yes | Yes, including file names |
| Repair data | No | Yes, optional recovery record | No |
For media files the size difference between the three is small, because photos and videos are already compressed.
How to open a split RAR archive
Big RAR archives are often split into parts named like film.part1.rar, film.part2.rar, or in older style film.rar, film.r00, film.r01.
- Download every part into the same folder. One missing part stops the whole extraction.
- Do not rename the parts.
- Open only the first part (part1.rar or the plain .rar). The tool reads the rest automatically.
Stay safe with archives
An archive can hide any kind of file, including programs. If a RAR from someone you do not know contains an .exe or other program when you expected photos or documents, do not run it. Archives with a password you were not given are also a warning sign, as they can be used to slip past virus scanners. Keep your extraction app up to date too, because archive tools have occasionally had security flaws that booby-trapped archives could exploit.
Frequently asked questions
How do I open a RAR file on a Mac?
macOS does not open RAR files out of the box. Use a third-party app or an online extractor.
Is RAR better than ZIP?
RAR can compress a little better and has recovery features, but ZIP opens on more devices without extra software.
Can I convert a RAR file to ZIP?
Yes. Extract the RAR, then zip the extracted files. Nothing inside changes.
What is a .part1.rar file?
It is the first piece of a split archive. Put all the parts in one folder and open part1 to extract everything.
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