Convert du1 to flif Online: du12flif

You can use Tom's Editor to easily convert images from
DU1, DUO .DU1 to Free Lossless Image Format .FLIF.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

DU1

DU1, DUO is an image format with extension DU1.

FLIF

Free Lossless Image Format is an image format with extension FLIF.