The demanding life nowadays limits people from doing their hobbies in their, spare time, including reading books. Borrowing books from a book loan center is a common practice in Indonesia. However due to the limited time, people go less often to such book loan centers. The rise of internet and mobile technologies facilitates people to easily borrow books online, without having to go physically to the book loan center. Therefore, it is necessary for every book loan center nowadays to provide a user-friendly online book loan system for its members. The aim of this research is to design a user-friendly application to borrow books online for Taman Bacaan Gubuk Dongeng, a book loan center located near Parahyangan Catholic University in Bandung. The majority of its customers are university students who like reading but have limited time due to their busy schedule. A number of user-centered design activities were conducted from identifying user requirements, generating design concepts through a design workshop, refining the selected design concept, prototyping, to evaluating the prototype. As primary users, university students were highly involved in the design process. The design workshop resulted in five design concepts from which one final concept was selected, further refined and developed to a low-fidelity prototype. The evaluation showed that the application has successfully met the user needs and user-friendly criteria.