Image Rotator

Turn on the grid and move the slider until the horizon, a wall or a door frame runs parallel to a grid line. Small tilts are usually between 1° and 3°; use the −0.1° and +0.1° buttons for the last step. Then choose Crop them away to remove the empty corners: the tool keeps the largest upright rectangle that fits inside the rotated picture, so the result has no blank edges. The stronger the rotation, the more is cropped, as the table shows for a 4000 × 3000 photo.

Rotating turns the picture around its centre, like turning a printed photo on a table. Flipping mirrors it: a horizontal flip swaps left and right, as in a mirror, which is useful for selfies taken with a front camera and for some printing processes; a vertical flip turns it upside down and mirrors it at the same time. Text in a flipped picture reads backwards, so check before you share.

Phones often save every photo in the same sensor orientation and add an orientation tag that tells viewers how to turn it. Some programs and websites ignore the tag and show the photo sideways. This tool applies the tag when it opens a photo, so you see it as it was taken, and saves the rotated pixels without the tag, so the result looks the same everywhere.

Quarter turns and flips move pixels without blending them. Rotating by other angles has to resample the picture, which softens it very slightly, so rotate the original rather than a copy that was already rotated. JPG and WebP results are saved at high quality (92); PNG is saved without loss. When the corners should be transparent, JPG pictures are saved as PNG, because JPG cannot store transparency.