In the method and device, electronic documents are created from a batch of physical documents of varying lengths. The batch comprises sub-batches of groups of multiple multi-page physical documents with separator sheets on each group. Each separator sheet is marked with a page count for any physical documents in its group. The batch is scanned-in and the resulting image pages are used to form the electronic documents. Specifically, the image pages are analyzed in sequence to identify document sheet image pages and separator sheet image pages. When a separator sheet image page is identified, the page count on that separator sheet image page is read and electronic document(s) is/are created from sequential set(s) of document sheet image pages, which follow the separator sheet image page and have the specific page count, until the next separator sheet image page is identified. This is repeated for all separator sheet image pages identified.