A .rar file is a compressed folder that bundles multiple files into one smaller package
When you see a file ending in .rar, you are looking at a compressed archive — a single container that holds other files and folders, squeezed down to take up less space. Think of it like a vacuum-sealed bag: everything inside still exists, but it takes up less room until you unseal it. The .rar format was created in 1993 by a Russian programmer named Eugene Roshal, and it remains one of the most common ways to bundle files for download or sharing.
The main reason .rar files exist is size. If someone wants to send you ten documents, five photos, and three videos, they could email them one by one — or they could compress them all into a single .rar file that is often 30 to 50 percent smaller. That smaller file downloads faster and takes up less storage space on your computer until you open it.
.rar files are also used to split large downloads into pieces. If a file is too big for one email or upload, the creator can break it into multiple .rar files — part1.rar, part2.rar, part3.rar — that you download separately and then combine back together.
Key Takeaways
- .rar files are compressed archives that bundle multiple files into one smaller package, similar to .zip files on Windows or Mac.
- You cannot open a .rar file by double-clicking it; you need software like WinRAR, 7-Zip, or Bandizip to extract the contents.
- Most .rar files are legitimate, but malware can be hidden inside them, so only extract files from sources you trust.
- If a .rar file is split into multiple parts (part1.rar, part2.rar), you must download all parts before extracting.
How .rar files differ from .zip files
Both .rar and .zip files compress and bundle other files, but they work slightly differently. .zip is built into Windows and Mac — you can right-click a .zip file and extract it without installing anything. .rar requires separate software to open, which is why you will see it more often in downloads from forums, torrent sites, or older file-sharing services.
.rar also compresses files more efficiently than .zip in most cases, meaning a .rar version of the same folder will be smaller. However, .zip is more universal: almost every computer can open a .zip file immediately, while .rar requires you to install a program first. For that reason, .zip is more common for everyday use, and .rar shows up more often in specialized downloads — software bundles, game mods, archived collections, or files shared on forums.
What software you need to open a .rar file
You cannot simply double-click a .rar file and read what is inside. You need a program that knows how to decompress it. The most common options are:
- WinRAR — the original software made by the creator of the .rar format. It costs money after a trial period, but many people use it anyway.
- 7-Zip — free, open-source software that opens .rar, .zip, and many other compressed formats. Works on Windows and Linux.
- Bandizip — free software for Windows that handles .rar files and is faster than some alternatives.
- The Unarchiver — free software for Mac that opens .rar and other compressed formats.
- Keka — another free Mac option for opening compressed files.
On Windows, 7-Zip is the most popular free choice. On Mac, The Unarchiver is the standard. Once you install one of these programs, right-clicking a .rar file will show an "Extract" or "Open with" option, and the contents will decompress into a folder on your computer.
Security risks when opening .rar files
A .rar file itself is not dangerous — it is just a container. But malware can be hidden inside one, just as it can be hidden in any file you download. The risk depends entirely on where the .rar file came from.
If you downloaded a .rar file from a reputable source — a software company's official website, a well-known forum, a trusted friend — the risk is very low. If you downloaded it from an unfamiliar torrent site, a suspicious email attachment, or a pop-up ad, you should be cautious. Before you extract a .rar file from an unknown source, consider whether you actually need what is inside, and whether you trust the person or site that provided it.
One common scam is a .rar file that looks like a legitimate program or document but actually contains malware. For example, a .rar file labeled "Adobe_Reader_Installer.rar" might not contain Adobe Reader at all. Always download software from the official website of the company that made it, not from a third-party download site or email link.
How to extract a .rar file
Once you have installed extraction software, the process is straightforward:
- Locate the .rar file on your computer.
- Right-click it and select "Extract" or "Extract Here" (the exact wording depends on your software).
- Choose where you want the contents to go, or accept the default location (usually a folder in the same place as the .rar file).
- Wait for the extraction to finish. For large files, this may take a minute or two.
- Open the new folder to see the files that were inside the .rar archive.
The original .rar file remains on your computer after extraction. You can delete it once you have confirmed that the extracted files are what you needed, or keep it if you think you might need to extract it again later.
What to do if a .rar file is split into multiple parts
Some large downloads are split across multiple .rar files: part1.rar, part2.rar, part3.rar, and so on. You must download all of them before you can extract anything. If you are missing even one part, the extraction will fail.
Once you have all the parts in the same folder, right-click the first one (part1.rar) and select "Extract". The software will automatically find the other parts and combine them. Do not try to extract part2.rar or part3.rar on their own — start with part1.rar every time.
If extraction fails and says a file is corrupted, it usually means one of the parts did not download completely. Re-download the part that failed and try again.
Frequently Asked Questions
Can I open a .rar file on my phone?
Yes, but it requires an app. On Android, apps like RAR, ZArchiver, and Solid Explorer can open .rar files. On iPhone, the Files app can handle some compressed formats, but you may need a third-party app like Archive Utility or iZip. Search your phone's app store for "rar extractor" to find options.
Why would someone send me a .rar file instead of a .zip file?
Usually because the .rar file is smaller, or because the person created it on a system where .rar is more common. Sometimes it is also a sign that the file came from an older download or a specialized community. If you do not recognize the sender, be cautious.
What happens if I delete the .rar file after extracting it?
Nothing bad happens. The extracted files remain on your computer in their own folder. The .rar file is just a container, and once you have extracted the contents, you no longer need it unless you want to extract it again later or send it to someone else.
Is it safe to download .rar files from torrent sites?
Torrent sites carry a higher risk because files are often uploaded by unknown users and may contain malware. If you do download from a torrent site, check the comments and user ratings first, use antivirus software, and extract the file in a safe location where you can inspect it before opening anything inside.