Image Watermark Tool: Add Text or Logo
Add text or image watermarks to photos — position, opacity, font, and rotation controls.
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Tags: image watermark tool, add watermark photo, image copyright stamp
Image Watermark Tool: Add Text or Logo An image watermark tool composites text or a logo overlay onto a source photo with configurable opacity, position, font, and rotation. The operation runs entirely in the browser via the Canvas API — your images stay on your device. --- Why Watermark Images? Watermarks serve several purposes: Copyright attribution — identify the creator when images are shared without context Content protection — deter unauthorized commercial reuse Branding — consistently stamp a website URL or logo on distributed photos Preview protection — low-resolution watermarked previews allow product browsing while protecting full-resolution files Watermarks are not cryptographically strong protection — a determined person can remove them. But they raise the cost of casual…
Frequently Asked Questions
How do I add a watermark to an image?
Upload the source image and either type text or upload a logo. Position the watermark, set opacity (30–60% is typical for non-intrusive protection), and download. The Canvas API composites both layers into a single exported file.
How do I make a transparent watermark?
Set `ctx.globalAlpha` to a value between 0 (invisible) and 1 (fully opaque) before drawing the watermark text or image. A value of 0.3–0.4 makes the watermark visible enough to deter copying while not obscuring the subject.
How do I position a watermark?
Common positions are center, bottom-right, and tiled. Center is hardest to crop out; bottom-right corner is conventional for photography; tiled repeating watermarks are the most theft-resistant but most intrusive.
How do I bulk watermark images?
Browser-based tools process one image at a time. For bulk watermarking, use ImageMagick's `convert` command in a shell loop, or a Node.js script using the canvas or sharp library. The same Canvas API logic applies.
What is the best watermark font?
Choose a font that's visible against both light and dark backgrounds. Sans-serif fonts (Arial, Helvetica) are most legible at small sizes. Adding a drop shadow or slight text outline improves contrast on varied backgrounds.
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