Embodiments of the invention provide for universal rebranding of a Web site. A method for Web site universal rebranding includes loading source code for a source Web site and source code for a target Web site. The method also includes parsing the source code to identify for each of the source Web site and the target Web site a style sheet framework, one or more icons representative of branded logos, and a color and font scheme. Thereafter, design ontologies for both the source and also the target Web site are generated based upon the respectively identified style sheet frameworks, icons, logos and color and font schemes. Finally, the ontologies can be compared to identify common design elements and the style sheet framework of the target Web site can be modified to incorporate design values for the common design elements drawn from the style sheet of the source Web site.