1Upload the videos that came out the wrong way round.
2Pick a quarter turn or a half turn, or type an arbitrary angle and choose a colour for the corners it will expose.
3Apply the rotation; the frames and the container display matrix are reconciled, so every player agrees on which way is up.
4Download the rotated Video file.
Rotate Video FAQ
How does Rotate Video turn the file?
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Concretely, the container rotation flag is preferred over redrawing frames, so most clips rotate instantly and only the containers that cannot carry the flag are re-encoded. Quarter turns and half turns are the common case and take the cheapest path available for the format.
Can I rotate by an arbitrary angle, not just 90 degrees?
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Yes, though the two are different operations underneath. A multiple of 90 degrees rearranges existing data; any other angle has to rebuild the grid and fill the corners, so it costs a resample and usually wants a background colour choosing.
Does the format decide whether rotation is lossless?
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It does. this format is read and written by the same streaming pipeline as everything else we support. That property is exactly what determines whether a quarter turn is free or costs a re-encode.
Anything specific to Video I should know?
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Yes — the container and codec are probed before anything runs, so mixed uploads in one batch are handled per file. It is the kind of thing that explains why a file looks right in one application and wrong in another.
Why does my clip play upright on my phone but sideways on a computer?
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Because the turn is recorded as a display matrix in the container rather than baked into the picture, and not every player reads it. Rotating here reconciles the two — the frames and the matrix end up agreeing, so the clip is upright in a browser, an editor and a TV alike.
Can I rotate a whole batch in one go?
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Yes. The same rotation is applied to every clip you upload, which is the practical fix for a set of phone recordings that all came in the wrong way round.
Which video formats does Rotate Video accept?
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MP4, MOV, MKV, WebM, AVI, WMV, FLV, 3GP, M4V, MPEG and MPG. Each file is probed for its real container and codec before anything runs, so a mixed batch is handled correctly file by file.
Is there a file size limit on Rotate Video?
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Yes: free accounts process video up to 1 GiB per file whichever container you brought; ffmpeg with x264, x265 and libvpx does the encoding. It is high enough that upload speed is usually the binding constraint rather than the cap itself.
Will Rotate Video lower the quality of my videos?
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Only if the operation requires re-drawing frames. Container-level and timeline-level work is done as a stream copy, which is bit-identical to the source and finishes in seconds. Anything that must re-encode does so at a quality level you choose.
Can I run Rotate Video on several videos at once?
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Yes, and it matters here more than anywhere else — video jobs run in minutes, so queueing the batch in parallel is the difference between one wait and several.
What happens to audio, subtitle and chapter tracks?
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They are carried across wherever the target container can hold them, including multiple audio languages, embedded subtitles and chapter markers, rather than silently keeping only the first track of each.
Does Rotate Video cost anything?
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No. Rotate Video is free without an account, and the output has no watermark, corner logo or intro card. Uploaded video is deleted from the workers shortly after the job completes.
