Put your name or your logo on a picture before it goes anywhere. Do a whole batch at once.
Drop in as many as you like. They all get the same mark.
Type some text or load a logo, then choose where it sits, how big it is and how faint.
Each marked picture is listed separately. Your originals are untouched.
A mark tucked into a corner at ten per cent opacity is polite and useless, it crops off in seconds. If the point is to stop the picture being used without you, repeat it across the middle where removing it means damaging the image.
If the point is just credit on something you are happy to share, the opposite is true: small, in a corner, faint enough to ignore.
A logo with a see-through background sits on a photo far better than one on a white block. Save it as a PNG before you bring it here.
No. The work happens inside this tab, on your own machine. Open your browser's network tab while you use the tool, there is no request carrying your file.
Practical limits depend on the tool, browser and available device memory. Large files can fail even when no explicit limit is shown. Keep an original and use a smaller job if this device cannot finish it.
No, and there is no daily limit either. There is nothing to sign up for.
Yes. Every photo you add gets the same mark, and you save them one by one.
No. You get new files; the originals on your device are untouched.
Use text, which starts as a copyright line with your name, or upload a logo. A PNG with a transparent background looks best. Place it in one of nine positions, set its size from 2 to 30 percent of the shorter edge of the photo, and set how faint it is from 10 to 100 percent. Text can be white, black, pink or yellow.
Repeat it across the whole picture tiles the mark. Tiled text runs at an angle, and a tiled logo is not rotated. Because the size is relative to each photo, a whole batch comes out looking consistent even when the photos are different sizes.
A watermark discourages casual copying and tells people who made the picture. It will not stop someone who is determined, because a mark in a corner can be cropped out. Put it where cropping it away would damage the photo, or tile it, which is much harder to remove.
The mark is drawn into the pixels, and each photo is saved separately with marked added to its name. Keep the originals without it. Use a faint setting around 40 to 50 percent so the photo is still pleasant to look at.