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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 image 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 without uploading your image

Put your mark across a photo — here in this tab, with nothing uploaded.

You watermark work you have not published yet. Uploading the clean original to a stranger's server to do it is exactly backwards.

Can the watermark be removed?

It is drawn into the pixels of the saved copy, so it cannot simply be peeled off — though no visible watermark is ever completely irreversible.

Can I watermark a whole batch?

Yes. Load as many photos as you like and apply the same mark to all of them at once.

Can I control how visible it is?

Yes — position and opacity are both adjustable, so it can be obvious or discreet.