Convert sld to dds Online: sld2dds

You can use Tom's Editor to easily convert images from
AutoCAD slide file .SLD to Direct Show Surface .DDS.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

SLD

AutoCAD slide file is an image format with extension SLD.

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.