Rotate Video Online
With rotate video online you fix a clip that plays sideways: turn it 90° clockwise, 90° counter-clockwise or 180°. The tool only changes the rotation flag in the file and copies picture and sound unchanged, so it takes seconds and keeps the quality. Everything happens in your browser.
Source: MDN – VideoEncoder.configure(): bitrate in Bit pro Sekunde. Updated: .
How it is calculated
Rotate a video without re-encoding
Many programs recalculate every frame when rotating, which takes time and costs quality. This tool instead writes only the rotation flag into the MP4 file and copies the already compressed picture and sound data bit for bit. A long video is done in seconds and the quality stays exactly the same.
How it works
- Drag in or choose a video (MP4 or MOV, for example from an iPhone).
- Choose the rotation: 90° right, 90° left or 180°.
- Click “Rotate video”, check the result and download it.
Good to know
- Playback: smartphones, browsers, VLC and the Windows and Mac players respect the rotation flag. Some editing programs or older devices ignore it and show the video unchanged.
- Rotating repeatedly: rotations add up: 90° right and then 270° gives the original again.
- Format: the result is always an MP4 file. WebM and MKV are not supported here.
- Mirroring (swapping left and right) is not possible this way.
Privacy
The video is only read piece by piece from your device; there is no upload and no server that sees it. The open-source library Mediabunny (MPL-2.0) reads and writes the video files and is loaded only when you open your first video.
Frequently asked questions
Is my video uploaded?
No. The video is read and processed in your browser and never leaves your device.
Does the video lose quality when rotated?
No. Picture and sound are copied without re-encoding; only the rotation flag in the file changes.
Why is my video still the wrong way round in a player after rotating?
Some programs and older devices ignore the rotation flag in the file. Re-encoding (for example in an editing program) burns the rotation into the frames.
How do I rotate an iPhone video that is sideways instead of upright?
Open the page in Safari, choose the video, set 90° right or left and rotate. The result is saved as MP4.
Can I also mirror a video?
No. This tool only rotates by 90°, 180° or 270°; mirroring requires re-encoding.
Sources and legal basis
- MDN – VideoEncoder.configure(): bitrate in Bit pro Sekunde
- MDN – EncodedVideoChunk.type (key/delta)
- ITU-T H.264 – Advanced video coding for generic audiovisual services
- Mediabunny 1.61.0 – Vanilagy (MPL-2.0), Quelltext
- Licenses of the media tools (MPL-2.0)
- ISO/IEC 14496-12 – ISO Base Media File Format: Transformationsmatrix im Track-Header (tkhd)
As of: · Editorial policy
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