Convert grf to dds Online: grf2dds
You can use Tom's Editor to easily convert images from
GRF, MAX, P41, PIX .GRF to Direct Show Surface
.DDS.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
GRF
GRF, MAX, P41, PIX is an image format with extension GRF.
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.