Texture Packer

Texture Packer streamlines game development by reducing texture memory usage and load times, which directly improves game performance. It achieves this by efficiently packing texture maps for engines such as Unreal and Unity, while maintaining high visual quality. Features include batch processing, custom layouts, and easy texture unpacking for editing.

If you want to learn more about channel packing, check out this video by Ben Cloward It explains the logic behind texture packing -

NOTE:

Because Windows Photos displays only alpha channels, packed textures may appear invisible; however, this is purely cosmetic, and all texture channels remain intact when imported into a game engine.