What a watermark actually achieves
A watermark serves two purposes, and it is worth being clear about which one you are after because they call for different designs.
The first is attribution. A discreet mark in a corner tells anyone who encounters the image where it came from, which matters when work is shared and reposted. This is the common case for photographers and illustrators building recognition.
The second is deterrence — making an image less usable without permission. That requires a much more intrusive mark, typically tiled across the whole frame, and it necessarily damages the viewing experience. This is what stock libraries do to preview images.
The honest limitation
A watermark does not prevent theft. Corner marks are trivially cropped out. Even tiled watermarks can be removed with modern inpainting tools, and increasingly by automated ones. Anyone determined to take your image will.
What a watermark does is raise the effort required and make casual, thoughtless reuse less likely. It also means that when an image does circulate, your name travels with it. Treat it as attribution and friction rather than protection.
Designing one that works
Opacity is the main lever. Too faint and it is invisible against busy areas; too strong and it dominates the image. Somewhere around 40 to 50 percent usually reads clearly without shouting.
The outline option matters more than it appears. White text vanishes against a bright sky and black text vanishes against shadow. A subtle dark outline behind light text keeps it legible on any background, which is the same technique used for subtitles and meme captions.
Placement in a bottom corner is conventional because it interferes least with the subject. A centre or tiled placement is for deterrence, not attribution.
Rotation and tiling
Angled, tiled watermarks are considerably harder to remove cleanly than horizontal ones, because the repeated diagonal pattern crosses more of the image content. If deterrence is the goal, a rotated tile at moderate opacity is the most effective configuration available here.
Keep your originals
Watermarking is destructive — the mark is burned into the pixels. Always work from a copy and keep the clean original safe, because you will eventually need an unmarked version for a client, a print, or a licensing sale.
A note on copyright
In most jurisdictions you hold copyright in your work from the moment of creation, whether or not it carries a watermark. The mark does not create rights; it makes them visible. Removing a watermark to obscure authorship is itself unlawful in several jurisdictions, separate from the underlying infringement.
Applied in your browser
Watermarking happens on a canvas locally. Your images are never uploaded.
Frequently Asked Questions
Does a watermark stop people stealing my images?
No. Corner marks are easily cropped and even tiled ones can be removed by inpainting tools. It raises effort and preserves attribution rather than preventing theft.
What opacity should I use?
Around 40 to 50 percent usually reads clearly without dominating the image. Higher for deterrence, lower for discreet attribution.
Why is the outline option useful?
White text disappears against bright areas and dark text against shadow. An outline keeps the mark legible on any background.
Which position is best?
A bottom corner for attribution, since it interferes least with the subject. Tiled and rotated for deterrence.
Can I remove a watermark later?
Not from the output — it is burned into the pixels. Always keep your clean original safe.