Abstract: A cutter for shortening blinds of the type consisting of a top rail, a bottom rail and a plurality of suspended slats therebetween, the cutter comprising a framework, a stationary matrix fixed with respect to the framework and comprising a first opening for receiving the top rail of the blinds, at least one second opening for receiving the slats in a compacted position, and a third opening for receiving the bottom rail. The first and third openings have shapes corresponding with the cross-sectional shape of the respective top and bottom rails. A support member is slidable with respect to the matrix and comprises a first blade for cutting the top rail, at least one second blades for cutting the slats and a third blade for cutting the bottom rail, at least the first and third blades being flush with a surface of the matrix. The cutter further comprises a displacement mechanism for displacing the support member with respect to the matrix in a direction perpendicular to longitudinal axes of the openings.