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Tool and Usage

UPX is tool to pack several executable formats. It is free, portable, and extendable, and well-known.

Screenshot for UPX tool review

Why this tool?

UPX is the abbreviation for "Ultimate Packer for eXecutables". It is considered to be a tool with a good compression ratio and fast decompression. It can be used to compress executables, making them smaller, while still having a low overhead of memory due to in-place decompression.

Additional information

UPX is free and open source software (GPv2+). It has special exceptions for commercial programs (see UPX License Agreement).

Usage and audience

Author and Maintainers


The UPX project is maintained by:

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Project details
Latest release 3.94 [2017-05-12]
Last updatedNov. 8, 2017

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GitHub iconUPX GitHub project
 UPX project website

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