Software with Palette Swapping

Swatchsmith is a batch palette-swap tool for pixel art. It loads PNG sprites, as single files or whole folders (sub-folders are kept), lists every colour they use, and lets you change colours one by one, lock colours, shift hue, saturation and brightness, or map a selection of colours to a palette by brightness order or nearest colour. Each set of changes is a variant, and every sprite is exported in every variant at once.

For parts of a sprite that share colours, a region can be painted on the sprite or loaded from mask images, so that a colour changes only inside or only outside it.

Palettes can be loaded from .hex (Lospec), .gpl, JASC .pal and paint.net files, or taken from a PNG image. The export is a ZIP with the recoloured PNGs, .hex and .gpl palettes for each variant, a palette lookup texture with Godot 4 and GLSL shaders for runtime palette swaps, and a project file for reusing the changes.

It is a single HTML file that runs offline in a desktop web browser; images are not uploaded anywhere. A free demo (3 sprites, 1 variant) runs in the browser. It is aimed at game developers and pixel artists who need team colours, enemy tiers or time-of-day versions of many sprites.