Convert 256 to pnm Online: 2562pnm

You can use Tom's Editor to easily convert images from
256, AP2 .256 to Portable aNy Map .PNM.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

256

256, AP2 is an image format with extension 256.

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.