Paper and pencil is a classical approach for user surveys, and it also applies to maps as a printed paper map can be the support for many kinds of annotations. But the annotations drawn on a paper map cannot easily be analysed in a GIS. This paper presents an online and open tool, called MapDraw, which was designed to annotate online maps, and directly reuse the annotations or drawings as a GIS input. The paper presents the functionalities of the tool. Then it describes possible uses within research in geographical information science, but also in mapping agencies or for professional users of topographic maps. Finally, the paper presents how the raw annotations of maps can be astutely analysed for different purposes.