Convert dds to xbm Online: dds2xbm

You can use Tom's Editor to easily convert images from
Direct Show Surface .DDS to X-Bitmap .XBM.
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.

XBM

X-Bitmap is an image format with extension XBM.