Convert dds to dng Online: dds2dng

You can use Tom's Editor to easily convert images from
Direct Show Surface .DDS to Digital Negative .DNG.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

DDS

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.

DNG

Digital Negative is an image format with extension DNG.