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There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Drop your video hereto load the tools

Nothing is uploaded — the tools run right here

Applies to every loaded image

Look Strength 100% Brightness Contrast Saturation Vibrance Vignette

Max width Format Shape

Shape Size Across Down Border

Text Where

100%

Rotate video — MP4 files, without uploading

Turn a clip the right way up, starting from MP4 video — here in this tab, with nothing uploaded.

A sideways phone video is a two-second fix that most sites want a full upload for.

Does this work with MP4 files?

Yes — that is what this page is set up for. MP4 is the format everything plays, and the safe answer when you are not sure.

Why is my video sideways in the first place?

Phones record the sensor's orientation as a note attached to the file. Players that read the note show it correctly; ones that ignore it do not.

Can I flip it as well as rotate it?

Yes — horizontal and vertical mirroring are both there.