Excerptor is a specialized tool designed to extract underlined or handwritten text from physical books. Using image processing and optical character recognition technology, it converts marked text within books into a digital format, making it easy for users to edit and save. This technology is significant as it assists users in swiftly extracting key information from a large volume of books, thereby improving research and learning efficiency. Excerptor meets the needs of various fields, including academic research, education, and personal study, with its efficient and accurate text recognition capabilities and user-friendly interface. Currently, Excerptor is available to users for free, with development and maintenance managed by the open-source community.