In this Photoshop tutorial, we are going to share a quick and easy way to straighten a crooked photo. If you do not use a tripod on a regular basis while taking photos, you are likely to have some of your photos crooked. Luckily Photoshop makes it unbelievably easy to straighten them with just a few simple steps. In this tutorial, we are going to use the below image to show how to straighten a crooked photo in Photoshop. Step 1: Select the Ruler tool. The best way to straighten an image in photoshop is to do it by Ruler