UPX (Ultimate Packer for eXecutables) is a free, portable, extendable, high-performance executable packer for several different executable formats. It achieves an excellent compression ratio and offers very fast decompression. Your executables suffer no memory overhead or other drawbacks for most of the formats supported, because of in-place decompression.

This app uses the NRV compression library for compression services. A compatible but somewhat less efficient OpenSource implementation is available through the UCL compression library.

In This Post

Download UPX

OS support: Windows, Linux

Windows

Download for Windows – x64

Download for Windows – x32

Download Dos version (Portable)

Linux

Download for Linux AMD64 – x64

Download for Linux i386 – x32

Download for Linux – ARM64

Product Specifications

Software Name	UPX
Version	5.2.0
License	GNU General Public License with special exceptions
OS Support	Windows, Linux
Language	English
Developer	UPX Team
Homepage	https://upx.github.io/
Last Updated	June 9, 2026

Key Features

High Compression Ratio: Achieves excellent compression ratios for executable files, reducing file size while maintaining full functionality.
Fast Decompression: Provides very fast decompression speeds, ensuring quick execution of packed files without significant delays.
In-Place Decompression: Supports in-place decompression for most formats, eliminating memory overhead during execution.
Multi-Format Support: Supports several different executable formats, making it versatile for various development environments.
Commercial Use Allowed: Special exceptions in the UPX License Agreement grant free usage for commercial programs.

Installation Guide

Show Installation Steps

Installation Steps

Download the appropriate version for your operating system from the releases page
Extract the downloaded archive file
Run upx.exe (Windows) or upx (Linux) from the extracted folder
Use command line arguments to pack your executables

Compatibility: Works on Windows, Linux, and DOS systems