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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 without uploading it

Put your mark on a clip — 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.

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.

Will the watermark be removable?

It is burned into the picture, so not without visible damage — which is the point.