Convert jp2 to dds Online: jp22dds

You can use Tom's Editor to easily convert images from
JPEG-2000 JP2 File Format Syntax .JP2 to Direct Show Surface .DDS.
Tom's Editor is a free, online image manipulation and converter program.

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JP2

JPEG-2000 JP2 File Format Syntax is an image format with extension JP2.

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.