Convert mgr to pnm Online: mgr2pnm

You can use Tom's Editor to easily convert images from
MGR Window Manager bitmap .MGR to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

MGR

MGR Window Manager bitmap is an image format with extension MGR.

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.