Upx for Windows

Upx: executable packer




UPX 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 because of in-place decompression.

UPX is copyrighted software distributed under the terms of the GNU General Public License, with special exceptions granting the free usage for commercial programs as stated in the UPX License Agreement.

This port of UPX uses the UCL compression library, which is a somewhat less efficient OpenSource implementation compatible with the NRV compression library for compression services <http://www.oberhumer.com/products/nrv>;.




If you download the Setup program of the package, the dependencies, as listed below under Requirements, are already included, apart from msvcrt.dll. If you download the package as Zip files, then you must download and install the dependencies zip file.

DescriptionDownloadSizeLast change
• Complete package, except sources Setup  466032 3 April 2004
• Binaries Zip  157451 3 April 2004
• Dependencies Zip  20252 3 April 2004
• Documentation Zip  50139 3 April 2004
• Sources Zip  346186 3 April 2004

You can also download the files from the GnuWin32 files page.

Installation and Usage

General Installation Instructions


All required packages from GnuWin32, i.e. excluding msvcrt.dll, perl, etc, are included in the Setup program and the dependencies zip file.

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