Convert rfg to png Online: rfg2png

You can use Tom's Editor to easily convert images from
LEGO Mindstorms EV3 Robot Graphics File .RFG to Portable Network Graphics .PNG.
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.

PNG

Portable Network Graphics is an image format with extension PNG.