Abstract: An apparatus for squaring, stapling, and stacking copies is used in combination with a copier that produces a succession of sheet copies and has a housing adapted to be positioned adjacent the copier, an upper support plate in the housing positioned to receive the copies from the copier and having a downstream end remote from the copier, and a stop flap at the downstream end and pivotal between a position blocking copies from sliding down off the downstream end and a freeing position permitting copies to slide down off the downstream end. A downwardly inclined lower support plate in the housing below the downstream end of the upper plate is positioned to receive copies sliding in the freeing position of the stop flap off the downstream end of the upper plate. A stapler is fixed in the housing adjacent the upper plate upstream of the downstream end thereof and an actuator is connected to the stapler for closing same on a stack of copies on the upper plate for stapling same together.