Paint3D generates high-resolution, unlit, and diverse 2K UV texture maps for untextured 3D meshes, and performs conditional generation based on text or image inputs. It first generates a rough texture map by creating view-dependent images with a pre-trained 2D diffusion model that considers depth information and then performs multi-view texture fusion. Subsequently, it employs specialized UV completion and UVHD texture models to remove the lighting effects and fill in incomplete areas. Paint3D can produce semantic-consistent, unlit 2K UV textures, significantly enhancing the texture generation quality of untextured 3D objects.