1. Click on the top (or left) ruler and drag it so it's next to you horizon line (or other similar object).
  2. Tools > Transform Tools > Rotate (or SHIFT+R).
  3. Turn image using your mouse, slider, or angle box in Rotate dialog.

  1. In the Toolbox:
    Set Interpolation to Cubic (best quality), or Linear (faster).
    Set Clipping to Crop with Aspect.
  2. Press Rotate.
  3. Image > Autocrop Image
  4. Image > Guides > Remove all Guides
Gimp 2.6.11

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