How to remove perspective in images using this handy cropping tool in Photoshop
Select the Perspective Crop tool from the same part of the Toolbar as the normal Crop tool. In the Options bar, tick the Show Grid box.
Click on one corner of your image to set the first perspective point. Click on the next corner to set a line that should run parallel with a straight edge.
Continue to place corner points (requires four in all) around the image. Drag the corners once in place to align the grid with edges.