Convert dds to flif Online: dds2flif
You can use Tom's Editor to easily convert images from
Direct Show Surface
.DDS to Free Lossless Image Format .FLIF.
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.
Free Lossless Image Format is an image format with extension FLIF.