Shift4cube UV Toolkit is an add-on that provides a centralized panel in the UV Editor sidebar for accelerating UV mapping workflows. The toolset is divided into four main sections focusing on data transfer, visual diagnostics, texel density management, and island organization.

The transfer tools allow you to copy UV coordinates and seam lines between objects with identical topology, or use proximity-based transfer for meshes with differing vertex counts. A diagnostic checker map feature temporarily applies a black-and-white grid to objects, with adjustable scale and projection methods, before restoring original materials. The texel density tools calculate and apply consistent texture resolution across different UV islands or objects. Additional utilities include a border selection command and quick-access buttons for standard unwrapping and packing operations.