PowerPoint has a fantastic little feature that allows you to save the original version of a picture after you edit it.
1. Right-click the picture that you have cropped or other edits that you have made, and then click Save As Picture.
2. Click the arrow next to the Save button, and then click Save Original picture.
Note When you add artistic effects to a picture, you save the picture with the effect, and you lose the original version. To revert a cropped picture to its original version