The best free alternative to UPX is FileOptimizer, which is also Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to UPX and eight of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to UPX are Appetize.io, ExEinfo PE, FUPX and kkrunchy.
FileOptimizer is a lossless file size optimizer supporting AIR, APK, APNG APPX, BMP, CBZ, DOCX, DLL, EPUB, EXE, GIF, GZ, ICO, JAR, JPEG, MNG, MP3, MPP, PNG, PPTX, ODT, OGG, OGV, PDF, PUB, SCR, SWF, TIF, VSD, WEBP, XAP, XLSX, and ZIP file formats among others.
Run iOS & Android Apps in the Browser for Preview, Support, Demos, Testing and Automation using the fastest emulators and simulators. Try the instant online demo at https://appetize.io
Packer, compressor detector / unpack info / internal exe tools.
Internal Tools and Ripper Menu :
Borland Delphi ( 2.0 - 7.0 ) Microsoft Visual C++ ver. 5,6,7,8.0 UPX exe/ dll 0.89.6 - 1.02 / 1.05 -3.03 -> Markus & Laszlo Aspack v2.12 -> Alexey Solodovnikov EXECrypto.
Graphical interface for the UPX packer which offers easy access to all documented and undocumented UPX parameters without the need for command line usage.
kkrunchy is a small exe packer primarily meant for 64k intros. It's relatively useless for anything else actually, because the depacker was relatively slow in older releases (about 1-2MB per second on my machine) and is dog slow in the newest version (about 90-120k per...
WWPack32 - Windows executable files compressor and protector. Compressed exe and dll files run exactly as before!. This program squeezes exe files and protects Win32 applications from cracking.
A library for some loosely related Microsoft compression formats, CAB, CHM, HLP, LIT, KWAJ and SZDD.
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Why is it in alternatives? It does not pack executables.