Rotate and Flip Video fixes footage whose orientation is wrong: a phone video shot sideways that lies on its side on a computer, a front-camera recording whose text is mirrored, an old camera export that is upside down. It is the “Rotate and flip” tab of the audio/video workbench, and its five operations map to ffmpeg filters: 90° clockwise (transpose=1), 90° counterclockwise (transpose=2), 180° (hflip,vflip), horizontal flip (hflip) and vertical flip (vflip).

The difference from “rotate” in a phone gallery is that a gallery usually only rewrites the rotation flag in the file, and any player or editor that ignores the flag still shows the video lying down. Here every frame is physically rearranged and re-encoded, so every player shows the new direction.

1. 01Add a video and select it— switch to the “Rotate and flip” tab; the preview above confirms the current wrong orientation.
2. 02Pick an operation— one of “90° clockwise”, “90° counterclockwise”, “180°”, “Flip horizontally” or “Flip vertically”; only one runs at a time.
3. 03Check the estimated command— make sure the -vf filter is the one you want (transpose=1, for example); the codec is fixed at H.264 CRF 20.
4. 04Process and download— click “Start processing” and download <original-name>_rotated.mp4; MOV / MKV / M4V sources keep their extension and other containers are written as .mkv.

Angles

— only multiples of 90° and mirrors; a frame tilted by a few degrees cannot be corrected (that needs rotation plus cropping, which this tool does not offer).

Re-encoding

— the picture must be re-encoded (H.264 CRF 20, preset fast), which takes about one fifth to one tenth of native speed; AV1 sources cannot be decoded.

Audio

— AAC / MP3 / AC3 / Opus / Vorbis / FLAC tracks are stream-copied without loss; other codecs become AAC 128 kbps.

Videos that already carry a rotation flag

— ffmpeg rotates the input according to the flag first, so the preview you see is the starting point of the operation, and the output no longer carries a rotation flag.

What it does not do

— it does not crop black bars or reframe (use “Video crop”), does not turn landscape into portrait with bars (use the portrait preset of “Video format conversion”), and does not process audio-only files.

The video is rearranged frame by frame and encoded locally in the browser by ffmpeg.wasm and is never uploaded. On first use the engine, about 31 MB, is downloaded from a CDN (the site asset domain or jsDelivr); that request contains no video content.