What is Watermark ?
A watermark is a visible embedded overlay on a digital photo consisting of text, a logo, or a copyright notice
What is use of Watermark ?
Watermark generally used to protect the images from its commercial or personal use without your permission. The idea of placing a watermark on your photos is so that others will not want to try to copy and use the photo without permission. Many Web sites use watermarks to show that a particular image is copyrighted, and it may not be copied and used elsewhere without the permission of the original Web site.
List of Online Watermark Tools :-