Convert atk to jpg Online: atk2jpg

You can use Tom's Editor to easily convert images from
Andrew Toolkit raster object .ATK to Joint Photographic Experts Group JFIF .JPG.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

ATK

Andrew Toolkit raster object is an image format with extension ATK.

JPG

Joint Photographic Experts Group JFIF is an image format with extension JPG.