How to Rotate or Flip a Video Online
In short
A video plays sideways because the file stores its picture one way and carries a tag that says how to show it. Rotating fixes the orientation by 90 or 180 degrees, and flipping mirrors the picture. Neither turns a wide video into a good vertical one, which needs a new crop around the face.
Why a video plays sideways
Most videos that play sideways were never recorded sideways. A phone films through a sensor that is fixed in its body, and it writes down how you were holding it. The picture is stored one way round and tagged to be shown another way.
Players that read the tag show the video upright. Some upload forms, older editors and a few apps ignore it, so the same file looks fine on your phone and sideways somewhere else. Annoying, but common. Knowing this matters, because the fix is different from turning a picture that was truly recorded on its side.
A good tool starts from the orientation the file already has. A poor one does not, and you can turn the video twice without noticing and end up upside down.
How to rotate a video online
The free video rotator runs in your browser. The file stays on your device, and there is no watermark and no account.
Drop in the video
The tool reads the orientation the file already carries and shows it on one of your own frames.
Choose the turn
Pick a quarter turn right, a quarter turn left, a half turn, or a mirror image. Check the preview before you export.
Export the MP4
The result is an MP4. When the orientation can travel as a tag, the frames are not compressed again.
What each setting does
A quarter turn swaps the two sides of the frame. A clip that is 1920 pixels wide and 1080 tall becomes 1080 wide and 1920 tall. A half turn keeps both sides the same length and only brings an upside-down recording back up.
Turn right moves the top edge of the picture toward the right, so a clip lying on its left side stands up. Turn left does the opposite. Pick one, look at the preview, and switch if it is wrong.
Mirroring is different. It swaps left and right, so a face changes side and any writing in the shot reads backwards. Use it only when you want that. A typical case is a selfie that the camera flipped for you. Mirroring always redraws every frame, while plain turns usually do not.
Rotate or flip: choosing the right one
People often use the two words as if they were the same. They are not. Rotating turns the whole picture around its center. Flipping, or mirroring, creates a reflection.
Rotate when the picture is sideways or upside down. That is the usual case. Flip when the picture is the right way up but reversed, such as a selfie where text appears backwards or a clip where you want the subject to face the other direction for a layout.
If you are not sure, rotate first and check the preview. Add a mirror only if the text or the subject direction still looks wrong. Doing both at once makes it hard to tell which step fixed the problem.
Landscape to vertical is a different job
Turning a wide video on its side does not make a good vertical video. The picture becomes tall and thin, and the people in it lie on their side or shrink to a narrow band in the middle.
A vertical short needs a new crop, not a turn. A tool has to find the face and cut a tall frame around it. That is what auto reframe does, and our guide to how auto reframe works explains the details.
Use rotation to correct a mistake in orientation. Use reframing to change the shape of the video on purpose. Mixing them up is the most common reason people end up with a short that looks stretched or squashed. Decide which of the two jobs you have before you open any tool. It takes a few seconds and saves a failed export.
Fixing a whole batch
If you film often, you will meet the same problem again. A phone held the wrong way, a camera mounted upside down, a screen recording that came out turned. Fixing each clip one at a time wastes effort.
Look for the pattern first. If every clip from one camera is upside down, the camera is mounted the wrong way, and the same half turn fixes all of them. If only some clips are sideways, the cause is usually how the phone was held at the moment you pressed record.
Name the exported files so you can tell them from the originals. A suffix such as the word upright is enough. Then move the originals into an archive folder, and keep them there until you have checked the rotated copies on the platform where you will post them.
Common problems after rotating
If the video still plays sideways in one app, the app may be ignoring the orientation tag. Export the file again, and try uploading the new MP4 rather than the original.
If the file is a WebM or MKV, note that those containers have no rotation flag that players honour, so the tool writes an MP4. That is why the output is always an MP4.
If the quality looks lower after you flipped the picture, that is the cost of drawing every frame again. It is small, but it exists. Keep the original file so you can try again from the source and not from a copy that has already been processed.
For a full picture of how a clip should look on each platform, see our post on posting one clip everywhere.
Frequently asked
Why does my video play sideways on some apps but not others?
Phones store the picture in one orientation and write a tag that says how it was held. Players that read the tag show it upright, while some upload forms and older editors ignore it. Exporting a rotated copy puts the correct orientation in the file.
What is the difference between rotating and flipping a video?
Rotating turns the whole picture around its center, which fixes a sideways or upside-down clip. Flipping, or mirroring, creates a reflection that swaps left and right, so a face changes side and any writing in the shot reads backwards.
Does rotating a video reduce its quality?
Often it does not. When the orientation can travel as a tag, the frames are not compressed again. Mirroring always redraws every frame, which adds the small cost of one encode, so keep the original file and work from it.
Can I turn a landscape video into a vertical one by rotating it?
Rotating only lays the wide picture on its side, so people end up tilted or small. A vertical video needs a new tall crop around the speaker, which is what an auto reframe tool does.
Written by
How this was made: first draft by an AI model, then edited and fact-checked by Alessio Battagliero. Every figure comes from GPT-Video’s own pricing or from a source linked in the sentence.
Founder, GPT-Video
Alessio builds GPT-Video, an AI video editor that turns long recordings into short vertical clips. He works on the clip-scoring and captioning pipeline day to day, and publishes short-form video with the tool while building it: the workflows in these posts are the ones he runs. Before GPT-Video he built Quantly, a multi-agent AI platform for retail trading. He works between Milan, New York and Hong Kong.
Written about in Fortune Italia.