Texture seam and atlas checker

Find visible tiling seams, atlas bleeding and dark alpha halos before they reach your engine. Score a repeating texture, preview it tiled and offset, blend the seam away, or load an atlas to measure the gutter between every sprite and the mip levels it can safely use. Files stay in your browser.

Drop a texture or atlas imagePNG, WebP or JPEG

Catch texture problems early

Seams show up when the left and right, or top and bottom, edges of a repeating texture do not match. The checker compares those edges with the typical difference between neighbouring pixels, so a score near 1 means the seam is as quiet as the rest of the image.

Atlas bleeding

Mipmaps average neighbouring pixels. A gutter of 2 pixels is safe for one mip level, 4 for two, 8 for three. The checker reports the smallest gutter in your atlas, which sprites are closest, and whether edges are extruded. Repack with the Sprite Atlas Packer to apply padding and extrusion automatically.