Abstract: An insert for a loose-leaf binder is provided with a perforation near one inside corner at a proximal end of the insert to receive one ring of a loose-leaf binder. The insert is thus positioned with respect to the rings of the binder, and retained by the one ring. In one embodiment, the insert is provided with a slot formed along the inside edge of the insert to receive at least one other ring of the binder. A first web between the perforation and the slot has a length less than the distance between adjacent rings of the binder. A second web at a distal end of the insert is sized likewise to fit between adjacent tings of the binder. Upon insertion into a binder and securement by the tings thereof, the insert holds the tings in the perforation and the slot. The perforation can be positioned to receive any ting, while the slot receives one or several adjacent tings within the length of the slot.