Add a Watermark to Photos
Stamp your brand, username or logo on your photos so nobody can take them without credit.
🔒 Your images are processed in this browser and are never uploaded.
When should you watermark your photos?
Photos you post on marketplace listings, Etsy or eBay product pages, second-hand sales ads and blog reviews get copied far more easily than you might think. Competing sellers reuse product shots you took yourself, and listing photos end up in scam ads. A semi-transparent brand or account name in the corner makes the source obvious — and makes copying enough of a hassle that most people give up.
For product photos that still need to look good, bottom right at 30–50% opacity is a safe choice. For sensitive documents such as copies of an ID or a contract, use a tiled (repeat) watermark that states the purpose — for example "For XYZ Bank application only" — across the whole image. That is the most reliable way to stop a copy being reused elsewhere. Keep in mind that a watermark in a single corner can simply be cropped out.
| Use | Suggested position | Opacity · size |
|---|---|---|
| Online shop product photos | Bottom right | 30–50% · text 4–6% |
| Blog and social media photos | Bottom right or bottom centre | 40–60% · logo 15–20% |
| Second-hand listing photos | Centre | 30–40% · text 6–8% |
| ID and document copies | Tiled (repeat), angle -30° | 25–35% · text 4–5% |
To fit watermarked photos under an upload size limit, use the image compressor; to turn iPhone HEIC photos into JPG first, use HEIC to JPG. More tools are in the image tools collection.
Frequently asked questions
Can I add the same watermark to multiple photos at once?
Yes. Select several photos together and the settings you see in the preview are applied to every one of them; the results download as a single ZIP. Text and logo sizes are set as a percentage of the photo width, so the watermark looks proportionally the same even when your photos are different sizes.
Does adding a watermark change the image format?
No — JPG stays JPG, PNG stays PNG and WEBP stays WEBP. Only formats that are awkward to use on the web, such as iPhone HEIC, GIF and BMP, are saved as JPG.
My logo shows up with a white box around it.
That is because the logo file itself has a white background. Use a PNG logo with a transparent background and only the logo shape will be stamped. If you don't have a transparent PNG, a text watermark with your brand or account name works well too.
Are my watermarked photos stored on a server?
No. Your photos and logo are combined entirely inside your browser and never sent to the CalcLab server. Close the page and your work is gone with it.