repak & retoc

To turn your edited files into a mod - or to open someone else’s mod to study it - you pack and unpack containers. Two community tools cover this.

repak - legacy .pak

repak packs and unpacks legacy Unreal .pak files. This is the primary path for Palworld mods.

• Unpack an existing .pak to inspect or modify its contents.
• Pack your modified files into a new .pak (remember the _P suffix for override paks).

retoc - IoStore (utoc/ucas)

retoc handles the IoStore / Zen container format (.utoc / .ucas). Some Unreal games ship content this way. Keep it in your back pocket in case you need to work with IoStore containers, but for most Palworld mod work the legacy .pak path with repak is what you’ll use.

Confirm the format for your build

Which container format applies can depend on the game build. Confirm before packing - see Palworld 1.0 vs early access and Pak pipeline.

References

• repak and retoc are open-source Unreal container tools; get current builds from their respective repositories and match versions to your workflow.
• The Unreal-Engine-based workflows (model/audio/translation) use Unreal’s own UnrealPak instead, as covered in those guides.