UV-Packer

Packer-IO starts with a mesh that already has UVs. Drag a supported file into the window, or use the plus icon to open it. Inputs include FBX, OBJ, glTF/GLB, DAE, PLY and STL.

Choose Pack, then set the source and target UV channels. Writing from channel 0 back to 0 replaces that layout; choose another target to preserve the original. Set rotation and tile options, select Efficient, Quality or Turbo, and click Pack. Quality spends more time placing islands, with less benefit when there are few islands or their sizes are similar. Turbo skips hole detection and convexity analysis.

Use the left sidebar's floppy-disk icon to export, choose a destination and format, and click Save. OBJ carries only channel 0, while STL cannot retain UVs. Keep mode merges existing UV data without moving islands or fixing overlaps.

The old Blender add-on has been replaced by UnwrellaConnect. The current extension requires Blender 4.2 or later and the installed Packer-IO application for free packing. UV unwrapping instead requires paid Unwrella-IO.

Artist use is free, including commercial work. Embedding the engine in commercial software requires the separate SDK, listed at EUR 5,000 for a permanent licence with one year of updates and support.