Convert gg to png Online: gg2png

You can use Tom's Editor to easily convert images from
Koala Painter 2, packed .GG to Portable Network Graphics .PNG.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

GG

Koala Painter is a Commodore 64 program do edit images. GG images are packed using RLE compression.

PNG

Portable Network Graphics is an image format with extension PNG.