Abstract: The massive growth of the world wide web along with the increasing availability of multimedia resources has increased a number of copyright issues. One of the areas that this growth has fueled is that of digital watermarking. Digital watermarking is the general technique of embedding a digital signal in the original file which may be used to verify its authenticity or the identity of its ownership. The approaches to watermarking are diverse and can be broadly classified based on their visibility, robustness and fragility. Their uses are also versatile, as they can be applied to text, images, audio, or video. In this paper, I did study on some of the watermarking algorithms for digital images.