upx/upx
Some data may be outdated — see provenance labels.
UPX - the Ultimate Packer for eXecutables observed · 2026-10-02
Health v2 · maintenance only
92/100
- Activity 97
- Release rhythm 80
- Longevity 100
Flags: no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-10-21. Adoption (stars, forks) is never an input.
- gap_med: 77.0
- age_days: 3702
- days_rel: 54
- days_push: 19
- n_releases_24m: 7
Adoption not part of the score
17913 stars · 1528 forks observed · 2026-10-02
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
UPX is a free, open-source executable packer that compresses programs and DLLs by roughly 50-70% while keeping them fully self-contained and runnable. It supports many executable formats across Windows, macOS, and Linux and is written in portable C++.
Use cases
- compress executables to reduce download size
- shrink binaries for software distribution
- pack a DLL to save disk space
- unpack a UPX-compressed binary
- reduce network load times for program downloads
When to choose
- you need to reduce the size of distributed binaries without changing their behavior
- you want a reversible, well-documented packer with no runtime or memory penalty
- you need cross-platform support for Windows, macOS, and Linux executables
When to avoid
- you need actual code protection or encryption - UPX explicitly provides none
- your target format is unsupported (e.g., ARM64 Windows is still pending)
- your antivirus pipeline flags packed binaries and you cannot whitelist them
Facets
cli-tool · maturity stable
compression cli developer-tools developer-tools cross-platform windows cli cross-platform executable-packer binary-compression self-extracting c-plus-plus command-line linux macos
2 sources
- readme: https://github.com/upx/upx · fetched 2026-10-02 · 515efd86b875
- homepage: https://upx.github.io · fetched 2026-10-12 · 554dfb206ede
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| upx/upx | main | 92 |
For agents
Data as of 2026-10-19T08:05:51.212177+00:00 · Report a problem