image conversion - How to convert multiple embedded PNGs to JPEGs in Powerpoint file?

I have a large PowerPoint file with many embedded images, some of which are JPEGs and some PNGs. To make the file as small as possible I would like all the PNG images to be converted to JPEGs.

This can be done by manually saving each image, converting it, and re-adding it to the presentation, but it takes a lot of time. Is there functionality to do a batch conversion in MS Powerpoint (2016), or some other method to achieve this more efficiently?

Added: I realise that images can be compressed in PowerPoint, and I have done that already. But that does not reduce the file size as much as replacing the PNGs with JPEGs, since the PNGs are much much larger files – hence the question.

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