I made a powerpoint presentation which I sent to my boss who made changes to the format so it matched presentation policy. I am just curious as to what he changed and was wondering if there was a tool to find all the differences between two PowerPoint Presentations and highlight them.

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up vote 3 down vote accepted

If you have a graphics program that can subtract images or do a layer with a subtraction blend mode, use that. Photoshop or Paint Shop Pro are two examples, and the GIMP probably works too.

Unfortunately it doesn't work directly with Powerpoint files, you have to save each page as a graphic file.

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Check out DiffDoc, that might give you what you need.

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seems to compare only text – Soldier.moth Jul 20 '09 at 18:55
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