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. Click Compare to open a browser window. Select the edited version of the presentation and click Merge. The Compare tool in PowerPoint. You will then enter Review Mode.

Before comparing two presentations, make sure that one of the two is currently open. Click the Review tab. If necessary, expand the Compare group. Click the Compare button. Navigate to and select the presentation you want to compare to the open one. Click the Merge button.