Described herein are techniques for synchronizing reading locations of electronic copies of a print medium with page numbers associated with physical copies of the print medium. A page number is derived from an image of a page of a physical copy of the print medium, and the image is captured by an electronic bookmark or electronic device in proximity to the physical copy of the print medium. The page number or image is provided to a synchronization service which synchronizes the page number with one or more reading locations or other page numbers.