Add a Watermark to an Image
Stamp your name, your site or your logo onto a photo. Position, opacity, size and rotation are all yours to set, and the whole batch can be watermarked in one pass — locally.
Drop your image here
or
Choose ImageYou can also paste an image with Ctrl+V
Images are processed on your device and never uploaded.
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Runs on your device — nothing is uploaded.
Working…
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- Original
- Result
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How to add a watermark
- Select the photo — or up to 20 of them.
- Choose Text or Image as the watermark type.
- For text: type it, then set font, size, colour, opacity and rotation.
- For an image: upload a logo — PNG with transparency works best.
- Pick a position from the nine-point grid, or drag it freely.
- Press Apply and download.
Designing a watermark that works
A watermark has to be visible enough to deter casual reuse and quiet enough not to ruin the picture. Some practical rules:
- Opacity 30–50%. Below 25% it vanishes on busy images; above 60% it dominates.
- Size it relative to the image, not in absolute pixels — around 4–6% of the image width for text. The tool scales automatically so a batch of mixed resolutions comes out consistent.
- Bottom-right is conventional, and also the easiest corner to crop off. Centre placement is far harder to remove but much more intrusive.
- Add a subtle shadow or outline so white text stays readable over a light sky.
- Keep a margin. Flush against the edge looks accidental, and can be trimmed by platforms that crop.
Logo watermarks
Upload a PNG or WebP with a transparent background — a logo on a white square will stamp the white square onto your photo too. Scale it to 10–20% of the image width and drop the opacity to around 40%.
A single-colour version of your logo, white or black depending on the photo, usually reads better than the full-colour original.
What a watermark can and cannot do
It deters casual copying and it credits you when an image is shared. It does not prevent theft: a determined person can crop, clone out or inpaint a watermark in minutes.
Treat it as attribution rather than protection. For anything valuable, keep the originals, register copyright where that applies, and consider using the metadata tools to check what your files disclose before publishing them.
Frequently asked questions
Are my images uploaded to your server?
No. The image is decoded, processed and re-encoded by your own browser using the Canvas and Web Worker APIs. There is no upload endpoint for this tool — open your browser's network panel while you use it and you will see no request carrying image data.
Can I watermark many photos at once?
Yes, up to 20 per batch. The watermark is scaled proportionally for each image, so mixed resolutions come out looking consistent rather than tiny on some and huge on others.
Can I add a repeating tiled watermark?
Not currently — the tool places one watermark at the position you choose. A tiled pattern is much harder to remove but also much more intrusive, and few people want it on a finished photograph.
Does watermarking reduce image quality?
Only through the re-encode. The watermark itself is composited at full resolution. Export at high quality, or as PNG, if you plan further editing.
What happens to my file when I close the tab?
It is gone. The image only ever exists in your browser's memory as an object URL; closing or refreshing the page discards it. Nothing is written to our servers, and nothing is stored on your device unless you download the result.