Aspects of the present disclosure provide methods and apparatuses for detecting duplicate copies of a form in an image of a document. An exemplary method generally includes obtaining a first digital image of a document, performing one or more transformations on the first digital image, determining one or more rectangles in the transformed first digital image, identifying at least a first duplicate copy of the form being depicted in the first digital image based, at least in part, on the detected one or more rectangles, and generating, based on the identified duplicate copy of the form, a notification that the first digital image includes at least the first duplicate copy of the form.