Convert atk to bmp Online: atk2bmp

You can use Tom's Editor to easily convert images from
Andrew Toolkit raster object .ATK to Microsoft Windows bitmap .BMP.
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.

BMP

Format created by Microsoft for their Windows and OS/2 operating systems. Images can be compressed or not.