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RAR file format

.rar · .rev  ·  archive+compression  ·  introduced 1993 by Eugene Roshal

What is a RAR file?

RAR (Roshal Archive) is a proprietary format developed by Eugene Roshal in 1993 and distributed through WinRAR. It typically achieves better compression than ZIP, especially on text and source code, and supports recovery records that can repair partially damaged archives. Creating RAR files requires a paid WinRAR license; extracting them is free in nearly every archiver.

Most readers reach this page after double-clicking a .rar file and finding their operating system unsure what to do with it. The good news: RAR is a well-understood format with mature tooling on every major platform. It is supported in one click by mainstream archivers on Windows, macOS, and Linux.

How to extract a RAR file

Opening a .rar file is straightforward on every modern operating system. The exact steps depend on which platform you are on:

On Windows

  1. Locate the .rar file in File Explorer.
  2. Right-click the file. If you have 7-Zip installed, choose 7-Zip → Extract Here. On Windows 11 the built-in extractor handles ZIP, 7z, RAR and several other formats directly through Extract All…
  3. If prompted, pick a destination folder and click Extract.
  4. The extracted files appear in a folder next to the original archive.

On macOS

  1. Find the .rar file in Finder.
  2. Install The Unarchiver from the Mac App Store, or Keka for both creating and extracting.
  3. Right-click the file → Open With → The Unarchiver (or just double-click after Unarchiver is set as the default).
  4. The extracted folder appears next to the archive.

On Linux

  1. Use your file manager: right-click the archive → Extract Here (file-roller on GNOME, Ark on KDE).
  2. On the command line, run one of: 
    unrar x archive.rar
  3. The files appear in the current directory.

How to create a RAR file

To pack files into a .rar archive, you typically need an archiver that supports writing this format. Not every tool can create every format — for example, only WinRAR can create real RAR files. The sidebar lists the software known to read and write RAR.

On the command line, the canonical create command is:

rar a archive.rar folder/    # requires WinRAR's rar binary

If you regularly create archives at scale, a dedicated archive automation suite can wrap this command in scheduled jobs, integrity checks, and offsite replication.

Strengths

  • Strong compression
  • Recovery records
  • Multi-volume archives
  • AES-256 encryption

Weaknesses and limitations

  • Proprietary and closed
  • Creation requires paid software
  • Slower than ZIP

Typical use cases

  • Multi-volume splits for large downloads
  • Backups with recovery records
  • Game and software piracy (historically)
  • Long-term storage where size matters

Technical details

RAR uses the RAR proprietary (Lempel-Ziv + PPM) algorithm and is identified on disk by the magic byte sequence 52 61 72 21 1A 07 00 (RAR4) / 52 61 72 21 1A 07 01 00 (RAR5). The standard MIME type is application/vnd.rar. The format is a proprietary specification and is subject to license restrictions for some uses (notably creation).

Frequently asked questions

Is RAR safe to open?

Archive files are containers — they are only as safe as what they contain. A .rar from a trusted source is fine; one received from a stranger can hold malicious executables, scripts, or files engineered to exploit bugs in your archiver. Always keep your archiver updated, and never run unknown executables that come out of an archive. A safe workflow is to extract into a sandbox and scan the contents before opening anything.

What is the maximum file size?

RAR5 supports archives up to 16 exabytes — effectively unlimited. RAR4 (the older format) was capped at 8 EB. In practice, the limit is your filesystem.

Can I password-protect a RAR?

Yes. RAR supports password protection with AES-256 encryption in modern archivers like 7-Zip, WinRAR, and PeaZip. Avoid the legacy ZipCrypto algorithm — it has been broken for years.

How does RAR compare to other formats?

See our format comparison pages such as ZIP vs 7z, ZIP vs RAR, and tar.gz vs tar.xz for side-by-side feature tables.

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