UPX

UPX is an advanced executable file compressor.

Free software · by Markus F.X.J. Oberhumer · upx.github.io

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What UPX’s own pages say

What it says it doesUPX is an advanced executable file compressor. upx.github.io
PlatformsLinux, Windows, macOS upx.github.io
Free planYes upx.github.io
Open sourceYes upx.github.io
Licensedistributed under the term of the GNU General Public License. upx.github.io

Each value is a quote AirStack found on the product’s own pages, read 2026-11-04. A missing field means AirStack has not found it on its pages.