The main objective of this diploma thesis is to analyze websites of electronics retailers. An initial analysis is followed by evaluation of the determined results and designing the right solutions. The diploma thesis is divided into a theoretical and a practical section. The theoretical section is focused on consumer behavior and the aspects of well-developed websites, which are visibility, usability, accessibility, technical and graphic design. These elements are the basis for the compilation of methodology, which is then used for analyzing websites. The practical section includes a detailed audit of five selected websites. It also contains user testing by randomly selected respondents. The detailed analysis is followed by a summarization of the results of individual companies. The output of the thesis is an overview of the quality of tested companies' websites. The main contribution of this thesis is an overall analysis and concrete design improvement of the electronics retailers' websites.