Convert apng to pnm Online: apng2pnm

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

Go to Tom's Editor

APNG

Portable Network Graphics is an image format with extension APNG.

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.