These are command-line tools for Windows, but they run perfectly under Linux via Wine or natively if you compile the C source.

If you’re working with old game assets, obscure firmware, or proprietary archives, you’ve likely run into files that look like junk but actually contain compressed data.

IoT firmware often contains multiple uImages or squashfs partitions compressed with zlib without container headers. Offzip can carve them out even when binwalk fails due to false positives.

In many game modding scenarios, users use Offzip to extract a file, modify it, and then use Packzip to re-compress it so it can be re-inserted into the original game archive at the same offset.