Academic library websites are becoming an increasingly important part of library operations and are extension of the libraries to the digital environment. Today’s libraries offer a wide range of services and information on their websites trying to meet user's information needs. With the rise in the number of Internet users, especially those who visit the library virtually, using a variety of mobile devices, quality and mobile accessible websites are becoming necessary. The purpose of this thesis was to determine which services and information are currently available on academic library websites, how they are organized and how they are optimized for mobile browsing. For the purpose of this research a comprehensive checklist was developed based on previous works on the subject. The checklist was then used as an instrument for the content analysis. In addition, a click-through analysis was used to gain insight into the organization and structure of websites. Research findings have shown that academic library websites, as expected, offer many services and information. Most of these are traditional library services that have been transmitted to the digital environment, however, there is a lack of new and innovative services that would attract new patrons and keep existing ones using the website. The structure of academic library websites is broad and shallow, and the majority of the most important content is available in just a few clicks. Libraries certainly need to invest more resources and effort to make available services simpler to use on mobile devices because, as research has shown, their websites are often not adequately tailored to mobile user’s needs, which are becoming a very significant user group.