Straighten a photo in Photoshop
Here is a quick way to straighten a wonky image in Photoshop:
1. Select the “Measure Tool” (in the eyedropper group)
2. Draw a line of a straight edge on your image. Use a horizon, wall etc.
3. Select >Image>Rotate>Arbitrary and the angle will have been filled in based on the previous line you drew.
4. Hit ok and Photoshop will adjust the image. Now crop.