Convert grp to pnm Online: grp2pnm

You can use Tom's Editor to easily convert images from
Screen 2 .GRP to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

GRP

Screen 2 is an image format with extension GRP.

PNM

PNM images are uncompressed 24 bit RGB images. Can cannot store Alpha channel. PNM images come in 2 types: binary and text. Especially popular on Linux.