A strap adjuster to adjust the length of a strap, such as used to form a pet collar, includes side rails and end rails defining a body. A central cross member and spaced ribs extend between the side rails, the central cross member, ribs, and end rails acting to define a plurality of openings. One side of the strap is looped around the central cross member and a second layer of the strap is passed into the strap adjuster through an opening between one rib and one end rail and passes out of the strap adjuster through an opening between the other rib and the other end rail. The ribs include notches or a textured upper surface to provide increased friction with a bottom surface of the strap.
