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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%

Change video speed — MP4 files, without uploading

Speed a clip up or slow it down, starting from MP4 video — here in this tab, with nothing uploaded.

Speed changes are quick to describe and slow to upload. This one skips the upload.

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.

What happens to the audio?

It is retimed with the video. You can keep the pitch where it was, so a sped-up voice does not turn into a chipmunk.

How slow can I go?

Slowing down repeats frames rather than inventing them, so past about half speed it starts to look stepped.