UPX

UPX offers a straightforward solution for compressing executable programs and DLLs, dramatically decreasing their file size. As a free and open-source utility, it applies high-performance packing that is completely safe and transparent to the end-user. The compressed files run normally, unpacking automatically in memory when launched. This optimization is perfect for streamlining software deployments, web downloads, and embedded systems where space is at a premium. Its simplicity and effectiveness make it a go-to choice for developers worldwide.