If you post photography, product shots or artwork online, someone will eventually repost it as their own. A watermark won't stop a determined thief, but it dramatically raises the effort and deters the casual scraper who just wants a free image.
Corner Watermarks Are Too Easy to Remove
A single logo in the bottom corner is defeated by a two-second crop. The far more effective approach is a tiled, repeating watermark spread diagonally across the whole image — to remove it, a thief would have to reconstruct the picture underneath every stamp. Open Watermark Image and enable the tiled/repeat mode.
Getting Opacity and Angle Right
The goal is "visible but not distracting":
- Opacity around 25–40%. Low enough that the photo still reads clearly, high enough that the mark can't be ignored or easily painted out.
- Angle of about 30–45°. Diagonal text is harder to clone-stamp away than horizontal text and survives cropping better.
- Size: medium. Tiny marks are croppable; giant ones ruin the image for everyone, including you.
What to Put in the Watermark
Use your brand name, website, or an @handle — something that doubles as free advertising when the image does get shared. Plain readable text beats an ornate logo for legibility at low opacity.
Batch It, and Keep It Private
If you are protecting a whole gallery, stamp them in one batch. Crucially, this tool watermarks inside your browser — your unpublished, high-value originals are never uploaded to a server that could leak or keep them. When you need a clean copy later (for a print sale, say), just re-export from your untouched original.