A split-level singulator for arranging and conveying articles in a single file. The singulator comprises a central conveyor and two flanking conveyors advancing in a conveying direction. Rollers in the conveyors protrude through the thickness of the conveyors and ride on underlying supporting bearing surfaces that cause the rollers to rotate as the conveyors advance in the conveying direction. The rollers in the central conveyor rotate in the conveying direction. The rollers in the flanking conveyors rotate in directions oblique to the conveying direction to direct articles conveyed atop the rollers downstream and toward the central conveyor. The tops of the rollers of the central conveyor are vertically offset above or below the tops of the flanking oblique rollers.