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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%

Merge video — MP4 files, without uploading

Join several clips into one, starting from MP4 video — here in this tab, with nothing uploaded.

Joining clips means handing over every one of them. Doing it here means none of them go anywhere.

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.

Do the clips need to match?

It goes most smoothly when they share a size and frame rate. When they do not, they are brought into line first, which means re-encoding.

How many can I join?

As many as your computer will hold. There is no server limit because there is no server.