A fabric alignment, marking and/or cutting guide that allows for accurate marking, and/or cutting of fabric along the diagonal using a multiple axis fixed edge alignment and a movable triangular angle. The alignment guide has a square cutting board with right angularly positioned upstanding angular edge surfaces for material engagement. A transparent hinged triangular cutting guide plate extends from one alignment edge surface defining a true diagonal line guide edge across a material square to be marked and cut positioned on the cutting board under the triangle guide plate.