Abstract. Augmented Reality is a technology which works with recognition algorithms based on computer vision. Day by day, new editions of books make huge volumes to the library as it makes it difficult for students as well as librarian guides to pick a correct book. By using the Augmented Reality (AR) application, our challenging task is, one able to search books in the library using a mobile camera with help of Unity3D and Vuforia. Details of the books like category, title and authors appear to the user through a mobile viewing device. Once we start the application the camera will fetch the image frame and identify the image (Marker can be of QR code). With the help of markers, 3D virtual objects appear in the corresponding location in the real world. So, the objective is to design a flexible model of 3D objects for the library as there is no need for a Library Guide, instead it acts as an AR Guide. The proposed Library Digital Guide using Augmented Reality has been tested at our college Library.