Convert pgm to pnm Online: pgm2pnm

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

Go to Tom's Editor

PGM

Portable aNy Map is an image format with extension PGM.

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.