What Is the Footprint Size of Unrar?

A typical installation of the unrar utility maintains an exceptionally lightweight footprint, requiring less than 2 megabytes of disk space and negligible system resources. This guide breaks down the precise storage footprint of unrar across major platforms, examines its minimal runtime memory requirements, and outlines the dependencies needed to run the tool.

Disk Space and Binary Size

The actual disk footprint of unrar depends slightly on the operating system, compilation flags, and whether the package comes from RARLAB (the proprietary, official freeware release) or the open-source unrar-free alternative.

  • Linux (Debian/Ubuntu/CentOS): The standalone unrar binary typically measures between 300 KB and 600 KB. When installed via standard package managers (like apt install unrar), the total installed size reported on disk is generally between 700 KB and 1.5 MB, which includes manual pages, documentation, and licensing text.
  • Windows: The official command-line executable distributed by RARLAB (UnRAR.exe) is approximately 350 KB to 500 KB. It does not require an installation directory or registry modifications and functions as a standalone portable file.
  • macOS: Installed via Homebrew or compiled from source, the binary occupies roughly 400 KB to 700 KB of storage.

Dependencies and Overhead

unrar is written in C++ and compiled directly to native machine code. It does not rely on heavy runtime environments, virtual machines, or large external frameworks.

  • Shared Libraries: On modern Linux systems, it dynamically links only to standard core libraries, such as libc and libstdc++. Because these libraries are already present on virtually every operating system, unrar introduces almost zero auxiliary dependency overhead.
  • Static Binaries: Completely static builds of unrar incorporate all necessary code directly into the executable, resulting in a single self-contained binary of roughly 1.2 MB to 2 MB.

Runtime Memory (RAM) Footprint

When idle or closed, unrar consumes zero RAM as it runs strictly as an on-demand process rather than a continuous background service or daemon.

During active extraction, memory usage is dictated primarily by the RAR dictionary size used when the archive was created:

  • Legacy RAR 4.x Archives: Typically consume between 2 MB and 8 MB of RAM during extraction.
  • Modern RAR 5.x Archives: The default dictionary size is usually 32 MB or 64 MB, resulting in runtime memory consumption of roughly 35 MB to 70 MB while unpacking. In rare cases where an archive is compressed with the maximum allowable dictionary size (up to 1 GB), memory usage scales to match the dictionary window, but typical day-to-day operations remain well under 50 MB of RAM.