A .rar file is a compressed archive — a single container that holds multiple files or folders squeezed down to take up less space
.rar stands for Roshal Archive, named after the Russian programmer who created the format in the 1990s. When you compress files into a .rar archive, the original files stay intact inside the container, but the total size shrinks. A folder with 500 MB of documents, photos, or videos might compress down to 200 MB as a .rar file. You cannot open or edit the files inside without extracting them first — you have to unpack the archive to get back to the originals.
The .rar format is similar to .zip files, which you may already know how to use. Both are archives. Both compress data. The main difference is that .rar typically compresses more efficiently, meaning it creates smaller files from the same content. However, .zip is built into Windows and macOS, so you can open a .zip file without installing anything extra. .rar files usually require a separate program.
Key Takeaways
- .rar files are compressed archives that hold multiple files in one container, similar to .zip files but with better compression.
- You cannot open or edit files inside a .rar archive without extracting them first using extraction software.
- Windows and macOS do not include built-in .rar support, so you will need to install a third-party program like WinRAR, 7-Zip, or Bandizip.
- On Windows, right-clicking a .rar file and selecting "Extract" works only if you have already installed extraction software that integrates with the context menu.
- .rar files are common for large downloads, software distributions, and file sharing because they compress efficiently and can be split into smaller parts.
How to open a .rar file on your computer
The steps depend on whether you use Windows, macOS, or Linux, and which extraction program you have installed.
On Windows: Download and install WinRAR (the official program), 7-Zip (free and open-source), or Bandizip (free). Once installed, right-click the .rar file and select "Extract Here" or "Extract to [folder name]". The files will unpack into a new folder in the same location. If you do not see an extract option, the software did not install correctly or did not integrate with your context menu — try opening the program itself and navigating to the .rar file from inside the application.
On macOS: The Unarchiver (free from the App Store) or Keka (paid, but widely used) will extract .rar files. Download and install one, then double-click the .rar file. The archive will unpack automatically. Alternatively, open the program, drag the .rar file into it, and click extract.
On Linux: Most distributions include command-line tools like unrar or bsdtar already. Open a terminal, navigate to the folder containing the .rar file, and type unrar x filename.rar (replace filename with the actual name). The files will extract to the current directory.
Why .rar files are used instead of .zip
.rar compression is more efficient than .zip, which means the same files take up less disk space when stored as .rar. For large downloads — software, video collections, or data backups — this matters. A 2 GB folder might compress to 1.2 GB as .zip but only 900 MB as .rar. Over many files or repeated transfers, that difference adds up.
.rar also supports splitting archives into multiple parts. If you need to send a large file over email or store it on a device with a size limit, you can create a .rar archive split into 50 MB chunks. Each chunk is a separate file, but they work as one archive when you extract them. .zip can do this too, but .rar handles it more smoothly in most programs.
Software developers and file-sharing communities often use .rar because of these advantages. You will encounter .rar files most often when downloading large programs, game mods, or media collections from third-party sites.
The difference between .rar and .zip
| Feature | .rar | .zip |
|---|---|---|
| Built into Windows | No | Yes |
| Built into macOS | No | Yes |
| Compression efficiency | Better | Good |
| Split archives | Yes, native support | Yes, but less common |
| Software needed | Third-party program required | None (built-in) |
| File size for same content | Usually smaller | Usually larger |
If someone sends you a .zip file, you can open it immediately on any computer without installing anything. If someone sends you a .rar file, you need extraction software first. This is why .zip remains more common for everyday file sharing — it is more convenient. But .rar is still widely used when file size matters or when the sender expects the recipient to have extraction software already installed.
What to do if you cannot open a .rar file
The most common reason a .rar file will not open is that you do not have extraction software installed. Download WinRAR, 7-Zip, or Bandizip (all free or low-cost), install it, and try again. After installation, you may need to restart your computer or log out and back in for the context menu integration to work.
If the file is corrupted or incomplete, extraction will fail partway through. This usually happens if the download was interrupted. Try downloading the file again from the source. If it keeps failing, the file itself may be damaged — contact whoever sent it to you and ask for a fresh copy.
If the .rar file is part of a multi-part archive (filename.part1.rar, filename.part2.rar, and so on), you must have all parts in the same folder before extracting. Open the first part (.part1.rar) and the extraction software will automatically use the others. If any part is missing, extraction will stop.
Security considerations when opening .rar files
.rar files themselves are not dangerous — they are just containers. However, the files inside them could be harmful. Before extracting a .rar file from an unknown source, think about where it came from. If someone emailed it to you unexpectedly, or you downloaded it from a site you do not trust, be cautious. Malware can be hidden inside archives just as easily as in any other file.
After extraction, scan the unpacked files with your antivirus software before opening them. Windows Defender (built into Windows) and most third-party antivirus programs can scan folders. If you are unsure about a file, do not run it — especially .exe files or scripts. A .rar file from a reputable software publisher or a trusted friend is generally safe, but archives from random websites or unexpected emails warrant extra care.
Frequently Asked Questions
Can I open a .rar file without installing software?
Not on Windows or macOS without third-party tools. Some online services like ezyZip or CloudConvert let you upload a .rar file and extract it in your browser, but this requires uploading your files to a stranger's server. For files containing sensitive information, this is not recommended. Installing extraction software on your own computer is safer and faster.
What happens if I delete the .rar file after extracting it?
The extracted files remain on your computer. The .rar archive is just a container — once you unpack it, you have the original files back. You can delete the .rar file if you no longer need it, just like you would delete a cardboard box after unpacking a delivery.
Can I edit files inside a .rar archive without extracting?
No. You must extract the files first to open or edit them. Some archive programs let you view files inside without extracting, but you cannot modify them. Extract, make your changes, and if you want to re-archive them, create a new .rar file with the updated versions.
Is WinRAR free?
WinRAR is technically paid software, but it runs in an unlimited trial mode. You can use it indefinitely without purchasing a license, though it will occasionally show a registration reminder. If you want a completely free option, 7-Zip or Bandizip are both free and open-source with no trial limitations.
Why do some downloads come as .rar instead of .zip?
.rar compresses better, so large files are smaller and faster to download. It also handles multi-part archives more smoothly. Developers and file-sharing communities choose .rar for efficiency, even though it requires an extra step for users who do not already have extraction software.