Straighten Horizon in Photos
Draw a line along the tilted horizon: the photo rotates level, and the empty corners are cropped away.
Drag a line along the horizon, a table edge or a wall in the photo, and the angle is picked for you. You can fine-tune it with the slider. Each photo gets its own angle.
Result
Drag a photo onto the form and draw a line along the horizon: press and drag from one edge to the other. The photo rotates so the line comes out level, and the empty corners left after the rotation are cropped away. If the first attempt comes out crooked, draw the line again on the rotated photo.
The horizon is not the only reference that works. A table edge, a roofline, a door frame, or a post will do: the tool aligns an almost vertical line straight up and down. A grid overlaid on the photo helps you check the result by eye.
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