Rotate by 90°, 180° or any angle
The two arrow buttons turn the picture by a quarter to the left or to the right, and 180° turns it upside down. A quarter turn keeps every pixel: only the width and the height swap places. For any other angle, type it in degrees: a positive angle turns the picture clockwise, a negative one anticlockwise. The slider under the picture adds a fine turn of up to 45° either way, in steps of a tenth of a degree.
How to straighten a crooked horizon
A horizon that leans by one or two degrees is enough to make a photo look careless. Click “Draw a level line” and drag along the horizon, the edge of a table or anything else that should be level. The tool turns the photo so that the line becomes straight. A line that is closer to upright, such as the side of a building, is made vertical instead. The grid over the picture helps you check the result.
Crop the corners or keep the whole picture
A photo turned by an angle that is not a quarter has empty corners. “Crop to fill” cuts the picture just enough to hide them and keeps its proportions, so the result is a little smaller. “Keep the whole picture” keeps every part and fills the corners with white, black or nothing at all: transparent corners need PNG or WebP, because JPG has no transparency.
Why a photo shows up sideways
A phone saves many photos lying on their side and adds a note that says which way up they are. Most apps read the note, but some websites and programs ignore it and show the photo sideways. This tool turns the pixels themselves, so the photo looks right everywhere.
Does rotating lower the quality?
A quarter turn moves the pixels without changing them. A turn by another angle has to work out new pixels from the old ones, which softens fine detail very slightly. A JPG is saved again, as every edited JPG is; save as PNG if you want no compression at all.