Rotate Video

Why your video looks fine on your phone and sideways everywhere else

This is the actual question behind most searches for a video rotator, and it has a specific answer worth knowing.

Phone cameras generally record the sensor's native orientation regardless of how you are holding the phone, and note how you were holding it as a rotation flag in the file's metadata. The pixels are sideways; a label says "display this rotated 90°".

Players that read the flag show the video correctly. Players that ignore it show you the raw sideways pixels. Your phone's gallery reads it, so the video looks perfect there — and then some desktop players, some editing software, some websites and some upload pipelines ignore or strip it, and the video is on its side. Nothing is corrupt; the video is exactly what it always was, and two pieces of software simply disagree about a label.

Rotating here works on the pixels rather than the label: the frames are genuinely turned and the video is re-encoded that way round. That is why it is the durable fix — there is no flag left for anything to disagree about.

Check it in the preview first

Pick a rotation and the preview video immediately shows that orientation — instantly, with no processing, because the preview turns the playing video rather than rebuilding the file. Watch a second of it and you will know whether you chose 90° left or 90° right correctly, which is the mistake everyone makes at least once.

If the processed result still is not the way up you wanted, run it again on the output with the opposite button. Two 90° turns in the same direction are the same as 180°, so nothing is lost by getting it wrong once — though each pass does re-encode, so it is worth getting right in one or two goes rather than five.

Rotate or flip — they are not the same

Rotate turns the frame. This is what you want for a sideways or upside-down video.

Flip mirrors it. Different job entirely, and useful in two specific cases: front-camera footage, which many phones save mirrored so any text in shot reads backwards, and matching the direction of movement between clips in an edit.

The trap with flipping: it mirrors everything, including text. Flip a clip containing a sign, a slide, a logo or a whiteboard and all of it reads backwards. If there is text in the frame, flipping is almost certainly not what you want.

What happens to quality and to the audio

Rotation changes every pixel's position, so the video genuinely has to be re-encoded — unlike adding an audio track, where the picture can be copied through untouched. One pass is visually fine; what you avoid is repeatedly re-processing the same clip through several tools, since each pass costs a little.

The audio is stream-copied, so the sound is bit-for-bit what you started with. No quality question there, and nothing to set.

Related tools

Crop Video reframes the picture, which is often what someone actually needs after rotating — turning a landscape clip upright rarely fills a vertical frame properly. Trim Video cuts it to length, and Video Compressor reduces the finished file.