You may need to compare two versions of a PowerPoint presentation to see the differences between them (e.g., if a colleague has edited it directly without noting the changes). And the quickest way to do this is with PowerPoint’s built-in Compare function. To use this: Open the original version of your presentation. Go to Review > Compare.

Use the Compare tool in PowerPoint to compare and merge two different versions of a file. In a collaboration scenario, you could send a review copy of a presentation to other people, collect their changes and comments in that copy, then use the Compare tool in PowerPoint to compare and merge the review copy with your original file.