Convert pnm to pdf Online: pnm2pdf

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

Go to Tom's Editor

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.

PDF

Adobe PDF format is the most popular document format. Overcomplicated. Offers compression.