How do I rotate a video 90 degrees?

Load the clip, choose 90° clockwise or counter-clockwise, and run it. Re-encoding moves the pixels so the result is upright everywhere; metadata-only is faster but relies on the player honouring the flag.

Does rotating a video reduce its quality?

Re-encoding costs one generation of compression, which is barely visible at a sensible quality setting. The metadata path is completely lossless because the video stream is copied untouched.

Why do phone videos come out sideways on a computer?

The phone records in one orientation and stores a rotation flag telling players how to display it. Software that honours the flag looks right; software that ignores it shows the raw sideways frames.

What is the difference between flipping and rotating?

Rotating turns the image around its centre and a quarter turn swaps width and height. Flipping mirrors it across an axis, which reverses text and cannot be undone by any amount of rotation.

Will rotating change the file size?

Metadata-only rotation leaves it essentially unchanged. A re-encode reshapes the file entirely, so the size depends on the quality setting rather than the original — expect it to be in the same ballpark.

Rotate Video

Turn a sideways clip 90, 180 or 270 degrees, or mirror it — by re-encoding the frames or just rewriting the rotation flag.

Rotate Video runs entirely in your browser. Your footage is never uploaded, stored or sent to a server.

Open the Video Resizer

关于 Rotate Video

There are two ways to turn a video and they are not equivalent. Rewriting the rotation metadata is instant and completely lossless, but it only asks the player to turn the frames — plenty of editors, social platforms and older players ignore the flag and show the clip sideways anyway. Re-encoding with the transpose filter actually moves the pixels, so every player honours it, at the cost of one quality pass. This tool offers both and explains which is which, rather than picking silently for you. Mirroring can only be done the second way, since a flip cannot be expressed as a rotation flag. Everything runs on your device, so a large clip never leaves your machine.

功能特性

90, 180 and 270 degree rotation, clockwise or counter-clockwise
Horizontal mirror and vertical flip
Lossless metadata-only mode for a quick fix
Full re-encode mode that every player and editor honours
Clears the source rotate flag so players do not turn the frames twice
Shows the output dimensions before you run it
Option to drop the audio track
Nothing is uploaded — the clip is processed in your browser

如何使用 Rotate Video

Drop a video file into the tool
Pick a rotation, a flip, or both
Choose metadata-only for speed, or leave it off to re-encode
Run it and download the result

示例

输入

A 1920 × 1080 clip rotated 90° clockwise

输出

1080 × 1920 portrait, re-encoded with -vf transpose=1

Quarter turns swap width and height; 180° leaves them alone.

常见错误与故障排除

The clip is still sideways after a metadata-only rotation. — The player is ignoring the rotation flag, which is common in editors and on some upload pipelines. Turn metadata-only off and re-encode so the pixels themselves move.
The video came out rotated twice. — The source already carried a rotate flag and the player applied it on top of the new frames. This tool clears the flag when it re-encodes, so re-run without any manual metadata edit.
Mirroring is not available in metadata mode. — A flip is not a rotation, and the display matrix has no way to express it. Mirroring always requires a re-encode.

常见问题

How do I rotate a video 90 degrees?: Load the clip, choose 90° clockwise or counter-clockwise, and run it. Re-encoding moves the pixels so the result is upright everywhere; metadata-only is faster but relies on the player honouring the flag.
Does rotating a video reduce its quality?: Re-encoding costs one generation of compression, which is barely visible at a sensible quality setting. The metadata path is completely lossless because the video stream is copied untouched.
Why do phone videos come out sideways on a computer?: The phone records in one orientation and stores a rotation flag telling players how to display it. Software that honours the flag looks right; software that ignores it shows the raw sideways frames.
What is the difference between flipping and rotating?: Rotating turns the image around its centre and a quarter turn swaps width and height. Flipping mirrors it across an axis, which reverses text and cannot be undone by any amount of rotation.
Will rotating change the file size?: Metadata-only rotation leaves it essentially unchanged. A re-encode reshapes the file entirely, so the size depends on the quality setting rather than the original — expect it to be in the same ballpark.