Grabware

Windows · Security & Antivirus

Ultimate Packer for eXecutables

Free, portable, extendable, high-performance executable packer for several executable formats

Version 5.2.1 · by Markus Oberhumer, Laszlo Molnar, John Reiser

Download

Official site: upx.github.io

About Ultimate Packer for eXecutables

UPX achieves an excellent compression ratio and offers very fast decompression. Your executables suffer no memory overhead or other drawbacks for most of the formats supported, because of in-place decompression.

## Antivirus False Positives

Antivirus software often mistakenly detects UPX as malware. The developers are aware of this issue [1](https://github.com/upx/upx/issues/437) [2](https://github.com/upx/upx/issues/337) and are working with antivirus vendors to prevent false positive detections in future.

How to install Ultimate Packer for eXecutables

  1. Click Download — the developer's official website opens in a new tab.
  2. Download the latest version there and run it. Choose Custom/Advanced where offered, and skip any bundled extras.
  3. Prefer the command line? With Chocolatey you can install and update it with: choco install ultimate-packer-for-executables
  4. Open Ultimate Packer for eXecutables once it finishes installing.
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Frequently asked questions

Is Ultimate Packer for eXecutables free to download?

Yes. The Download button sends you to upx.github.io, the developer's official site, where Ultimate Packer for eXecutables is available to download. Grabware doesn't host or modify any files.

What is the latest version of Ultimate Packer for eXecutables?

The version listed here is 5.2.1, published /Date(1787. The developer's site always has the newest release.

How do I install Ultimate Packer for eXecutables from the command line?

With Chocolatey, run: choco install ultimate-packer-for-executables. This installs it from the official source and keeps it updated.

Is Ultimate Packer for eXecutables safe?

Ultimate Packer for eXecutables downloads directly from the developer. As always, scan the installer with your antivirus and choose Custom setup to skip any bundled extras.

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