How to Fix a Tilted Horizon with Photoshop
For a bonus addition to this feature article, here’s a short how-to on making a horizon level.
Open an image with a horizon that’s not level. Instead of having to guess the angle to fix this at, here’s a short method that is lot more effective. You can use this image and save it to the computer and open in Photoshop.

Click-and-hold the Eyedropper tool to pull out the menu. Click on the Ruler tool.

Click-and-drag the Ruler tool along the crooked horizon.

Go to Image>Rotate Canvas>Arbitrary.

The degree of angle will be set to change the ruler to being level. Press OK.

Now we have some areas to crop out. Select the Crop tool.

Finally, we have a level horizon. We did change the composition though because areas had to be cropped out, so weigh the pros and cons before adjusting a horizon.
