Convert rfg to flif Online: rfg2flif

You can use Tom's Editor to easily convert images from
LEGO Mindstorms EV3 Robot Graphics File .RFG to Free Lossless Image Format .FLIF.
Tom's Editor is a free, online image manipulation and converter program.

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RFG

LEGO Mindstorms EV3 Robot Graphics File is an image format with extension RFG.

FLIF

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