Convert dds to gg Online: dds2gg
You can use Tom's Editor to easily convert images from
Direct Show Surface
.DDS to Koala Painter 2, packed
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
DDS are files invented by Microsoft to be used in games, mostly as textures. Images can be compressed to save space but the compression methods defined by DDS are all very fast in terms of coding and decoding.
Koala Painter is a Commodore 64 program do edit images. GG images are packed using RLE compression.