Abstract: A jointer for smoothing mortar joints has an elongate handle and offset trowel portion at each end. Each trowel portion is shaped to gradually decrease in width toward its free end and is convexly curved to enable the use of one tool for a number of joints of different width. One trowel portion is shorter than the other to improve the convenience in compacting head joints. Both blades are offset to the same side of a centerline of elongation of the handle. The tool provides a simple and inexpensive improvement by rendering the tool suitable for different widths of the joint while also improving the convenience of working with the tool.