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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%

Add a watermark to video — MP4 files, without uploading

Put your mark on a clip, starting from MP4 video — here in this tab, with nothing uploaded.

Watermarking is what you do to footage before it goes out into the world. It would be strange to have to send it away first.

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.

Can I use an image as the watermark?

Yes — a PNG with transparency sits on the footage cleanly.

Can I move it around?

Yes. Drag it where you want and set how visible it should be.