Cropping is the removal of the exterior edges of an image to fit a particular size or shape. The Microsoft Office suite of applications includes cropping tools to crop images to specific sizes, aspect ratios and a variety of shapes. The shape library includes simple shapes such as ovals and rectangles, as well as more complex shapes like stars and banners. By combining the oval crop with an aspect ratio of 1:1, the result is a circular image.
Open PowerPoint and import an image.
Click the image to select it.
Click the "Format" tab to open the Picture tools.
Click "Crop" and "Crop Shape" in Windows 2010 or "Picture Shape" in Windows 2007. Select the "Oval" crop.
Click "Crop" and "Aspect Ratio" and select "1:1" to make the crop a circle.