Convert npm to pnm Online: npm2pnm

You can use Tom's Editor to easily convert images from
Nokia Picture Message .NPM to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

NPM

Nokia Picture Message is an image format with extension NPM.

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.