Rotate images by 90°, 180°, 270° or a custom angle. Flip images horizontally or vertically.
Rotate it by 90 degrees and check the preview. If it is now upside down, rotate by 180 instead.
Rotating turns the image around its centre. Flipping mirrors it, so text inside the picture reads backwards.
Yes. Enter a small custom angle rather than using the 90 degree buttons.
A 90, 180 or 270 degree turn rearranges whole pixels and loses nothing. A custom angle has to resample the image, which softens it very slightly.