Abstract: A cutter is described for cutting through an article, such as an envelope, at a given distance from its edge, approximately straight and parallel to the edge. An edge portion of the article to be cut, such as an envelope, is positioned on a floor, and then it is slid with its edge in contact with a sliding side surface perpendicular to the floor. The thing to be cut is pressed against the sliding surface with a press means when cut and slashed with a blade edge at a given distance from the envelope edge approximately straight and parallel to the edge.