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upx-ucl

Efficient live-compressor for executables

uncategorizedRed Team
Official docs ↗Download ↗Source repo ↗

Platforms: Linux · Last verified September 6, 2026

UPX is an advanced executable file compressor. UPX will typically reduce the file size of programs and DLLs by around 50%-70%, thus reducing disk space, network load times, download times etc. The current version can compress executables for DOS, Linux/ELF (i386, amd64, ppc32) and some other files for different OS.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.

Getting started

See the official Kali tool page and upstream homepage linked above for installation and usage details.

Commonly preinstalled on

Kali Linux

Debian-based distribution built for penetration testing and security auditing