Free Browser Tool Generates 47-Tile Autotile Sets from Just Two Source Tiles

A developer has released a free, browser-based tool called 47-Tile Terrain Autotile Maker that automatically generates a complete autotile set from two user-selected ground tiles, eliminating the need to draw every edge, corner, and transition manually. The tool works by reducing 256 possible neighbor combinations to the 47 valid ones that can realistically appear on a map, matching the tile format expected by both Godot's terrain system and Unity's Rule Tile. Users can choose from six built-in terrain pairs, select tile sizes between 16 and 64 pixels, and customize boundary styles, corner roundness, and edge roughness before downloading. Exports include a PNG tile sheet at up to 8x resolution, a sample map image, and a JSON manifest with neighbor masks and engine-specific conditions for Godot and Unity. The tool runs entirely in the browser with no sign-up required and no file uploads, and includes 57 automated checks to ensure output colors are drawn only from the two source tiles.