This article explains how to create a torn paper edge on an image in Photoshop. This information applies to all recent versions of Adobe Photoshop for Windows and Mac.
Creating a torn paper edge effect in Photoshop is a fairly simple process. However, since it requires the use of a small brush, it can be time-consuming. Apply this technique to any image element where you want to create the appearance of torn paper:
In Photoshop, open a file containing an image to which you want to add a torn paper edge. Select the Lasso tool from the Tools palette.
Click and drag to draw a jagged oval around one side of the image, with one side on the image representing the torn edge and the other side extending onto the canvas.