Convert mng to pnm Online: mng2pnm

You can use Tom's Editor to easily convert images from
Multiple-image Network Graphics .MNG to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

MNG

Multiple-image Network Graphics is an image format with extension MNG.

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.