Convert dds to cis Online: dds2cis
You can use Tom's Editor to easily convert images from
Direct Show Surface
.DDS to Compuserve RLE image .CIS.
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.
Compuserve RLE image is an image format with extension CIS.