Image Watermark

How Image Watermark works

Stamp text onto an image in any corner or the centre, with adjustable size, colour and opacity. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

The four settings

Text, size (10–120 px), opacity (0.1–1) and colour, plus a position. The default is “© Toolcin” at 42 px, 65% opacity, white — readable over most photos without dominating them.

Size is in output pixels, not a percentage, so the same setting is subtle on a 4000-pixel photo and dominant on a 600-pixel one.

Making it visible but not ugly

White text at 60–70% opacity works on dark images and disappears on light ones; the reverse is true for black. If the image is both, add a subtle shadow or place the mark in a corner that is consistently dark.

Centre placement is the most effective against reuse and the most annoying to look at. Corner placement at 50% opacity is the usual compromise.

What a watermark does and does not do

It discourages casual reuse; it does not prevent it. A visible watermark can be cropped out or painted over, and it cannot be removed without leaving evidence — which is the point, because evidence is what supports a takedown claim.

Burning the text into pixels also means it survives screenshots and re-uploads, unlike CSS overlays.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions