ABSTRACT-Phishing attack is the simplest way to obtain sensitivity information from innocent users. The aim of the phishers is to acquire critical data like user name, password and bank account details. The proposed system mainly focuses on detecting and preventing the phishing websites. A Web crawler is used to detect the websites. Detected phishing sites are added to the black list. The black list contains only fake websites. Web Crawling focuses on obtaining the links of the web page. Usually, a phishing website can be easily identified by its URL by its HTML code. Here the check website page makes users to be aware of phishing website and avoid users to become victim of such attacks. This software is very helpful for users to identify and prevent the phishing websites. For this purpose, we are developing a phishing website detection system.