Abstract: The invention relates to a pocket-sized device for photocopying small parts of documents. A flat package (1) includes a first face (2) for reading the document by means of a charge coupled device for transferring charges (4, 18) and at least one incremental wheel (6), which as it rolls without sliding on the document furnishes a time base for the reading interval (24). It includes a second face (3) for reading, by means of a matrix printer (12), and at least one incremental wheel (11). At each reading interval, the data are stored in memory (16). For writing, the device is turned over, and the writing wheel (11) controls the transfer of data from memory (16) to the printer (12) via an amplifier-multiplexer (17). Application to taking notes by localized photocopying of a quotation in a text, an equation, or a diagram.