Convert jpeg to dds Online: jpeg2dds
You can use Tom's Editor to easily convert images from
Joint Photographic Experts Group JFIF .JPEG to Direct Show Surface
Tom's Editor is a free, online image manipulation and converter program.
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The most popular image format. Does not support Alpha channel. Images are always lossy coded so when an image is saved as JPEG it always looses a bit of quality.
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.