https://convertio.co/formats/rgf/
RGF (LEGO Mindstorms EV3 Robot Graphic Format) Conversion Types — Convertio
RGF is a popular Image file format, which you can convert into 104 another file formats such as PDF, JPG, PNG, etc. online and free without registration....
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https://tomseditor.com/convert/convert-image-to-RGF?l=en
Convert image to LEGO Mindstorms EV3 Robot Graphics File (.RGF) - Tom's Editor
Convert photos online. Change JPEG into PDF, GIF, BMP, SVG
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