AbstractWe are providing a Client-side privacy protection for personalized web search.. Any PWS captures user profiles in a hierarchical taxonomy. The system is performing online generalization on user profiles to protect the personal privacy without compromising the search quality and attempt to improve the search quality with the personalization utility of the user profile. On other side they need to hide the privacy contents existing in the user profile to place the privacy risk under control. User privacy can be provided in form of protection like without compromising the personalized search quality. In general we are working for a trade off between the search quality and the level of privacy protection achieved from generalization.