Import Pixel Art is a Blender add-on that converts pixel art images into 3D geometry, creating one element per pixel. Pixels with 100% alpha are skipped, and every pixel of the same color shares a single material, so adjusting that material updates all matching pixels at once.
Two import modes are available. Separate Cubes creates a 1x1x1 cube for each pixel as its own object, all parented to an empty so the whole piece can be transformed together and moved pixel-by-pixel while holding ctrl. 2D Mesh places every pixel as a plane in one single mesh, which imports faster; extrude by one unit in Z or add a solidify modifier if you want depth.
Materials can optionally use nodes, and existing materials with matching names can be reused. Object, pixel, mesh and material names follow format string patterns using variables like {filename}, {color}, {x} and {y}. An optional auto down-scaling step handles pixel art that was up-scaled to an exact integer multiple, working best with PNG, BMP or GIF rather than lossy formats.