Convert duo to flif Online: duo2flif

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

Go to Tom's Editor

DUO

DU1, DUO is an image format with extension DUO.

FLIF

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