Convert pj to dds Online: pj2dds

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

Go to Tom's Editor

PJ

HP PaintJet file is an image format with extension PJ.

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.