Converting general image formats in RGB565 to RGB888

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Hi. Does anyone know a good tool to convert RGB565 images in standard (i.e. PNG) image formats into standard RGB (preferably a web-based tool)?

Can you elaborate more on what exactly you're trying to do? PNG seems to only support grayscale, RGB888, and RGBA8888 images (according to Wikipedia), so exporting an image to PNG will transform it into RGB888 regardless of the original format.