Convert dds to pdf Online: dds2pdf

You can use Tom's Editor to easily convert images from
Direct Show Surface .DDS to Portable Document Format .PDF.
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.

PDF

Adobe PDF format is the most popular document format. Overcomplicated. Offers compression.