Rotate video — in your browser, nothing uploaded

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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%

Questions

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.

Does rotating lose quality?

Turning by a quarter or half turn is lossless in principle; the clip is written out again, which costs a little.