Use the free Rotate Video tool below: turn a sideways MP4 or WebM clip the right way up, or mirror it, right in your browser. Your file never leaves your device.
How to rotate or flip a video
Pick a video file from your phone or computer. MP4 and WebM work in most browsers, and MOV works if your browser can play it. The tool reads the size and length of your clip and shows them above the controls, so you always know what you started with.
Next, choose what you want to do. Rotate 90 degrees clockwise turns a sideways phone clip upright. Rotate 180 degrees turns an upside-down clip the right way up. Rotate 270 degrees clockwise is the same as a 90-degree turn to the left. Mirror left to right flips the picture like a mirror, and flip top to bottom turns it over. The preview frame under the controls shows the change before you process anything, so a wrong choice costs you nothing.
Press the button and wait. The tool plays your clip once, draws each frame turned or mirrored on a canvas, and records the result. When it finishes, a player shows the new video, with the old size and the new size side by side. Download it, and if the turn is wrong, run the original file again with another option. Do not re-run the downloaded file: every run re-encodes and loses a little quality.
Worked example: a sideways phone clip turned upright
Here is a real run of this tool, made with a short test clip. The test clip was 320 pixels wide and 180 pixels tall, lasted 2.0 seconds, and was 29.7 kilobytes. It was recorded in landscape, but the scene in it was meant to be seen upright.
The 90-degree clockwise option was picked. The preview frame showed the new upright shape at once: 180 pixels wide and 320 pixels tall. After processing, the downloaded video was 180 by 320 pixels, lasted 2.07 seconds, and was 111.6 kilobytes in MP4 form, because this browser saves MP4 output. The length stayed the same, the width and height swapped places, and the sound track stayed with the picture.
That swap is the key fact to remember. A 90-degree or 270-degree turn always swaps width and height. A 180-degree turn and both mirror options keep the same width and height as the original, because the frame is not turned on its side. If your video site or player expects a certain shape, check the new size shown on the result before you upload.
When this tool is useful
The most common use is a phone video shot the wrong way round. Phones record in the direction they were held, and a clip shot with the phone on its side can play sideways on a computer or a TV. A 90-degree turn fixes it without any editing app or account.
Mirroring has its own uses. A selfie video can show text backwards, and a mirror flip puts it right. A dance or exercise video filmed facing a mirror can be flipped so the moves match the viewer. A 180-degree turn rescues a clip recorded with the phone fully upside down, which happens more often than people admit.
Creators also use rotation to fit a platform. A wide clip can be turned upright for a short-form feed, and a tall clip can be turned wide for a normal player. Turning a wide clip upright adds no new picture: the scene will look narrow.
Honest limitations
The output is re-encoded, not a lossless edit. That means the picture is drawn again and compressed again, so a small loss of sharpness is possible, especially if you rotate the same file several times in a row. Always keep your original file and rotate from that, not from a rotated copy.
Processing takes about the length of the clip, because the tool plays the video in real time while it records. A two-minute clip takes about two minutes. Keep the tab open until it finishes.
The output format depends on your browser. Chrome, Edge and newer Safari save MP4, while Firefox saves WebM, and the tool tells you which format you will get before you start. The canvas size becomes the rotated size, so a 90-degree turn on a 1920 by 1080 clip gives you 1080 by 1920. Files never leave your device: everything runs in your browser, and nothing is uploaded.
Frequently asked questions
Will rotating my video hurt the quality?
A little, because the output is re-encoded. One rotation of a normal clip is hard to notice. Rotating the same file again and again will soften it, so always start from the original file.
Why did my file get bigger after rotating?
The tool records at a fixed bitrate, so a very small or very short original can come out larger than it went in. The picture is not better for being bigger; the size comes from the recording settings, not from added detail.
Does the sound stay with the video?
Yes. The audio track from your original clip is carried into the recording, so the turned video still has its sound. If your original had no sound, the result has none either.
Can I rotate only part of a video?
No. This tool turns the whole clip. If you need to cut a section first, trim the clip with a video trimmer, then rotate the trimmed result.
Spanish version: Girar Video Online