Photoshop has arrowheads built in, you just need to know where to find them. When you choose the Line tool (nested with the Rectangle tool [U] in the Toolbar), you can access the arrowheads whether you’re using the Pixels, Path, or Shape Tool Mode. Look for the gear icon up in the Options Bar and click it to open the options. Under Arrowheads, choose Start, End, or both to add arrowheads to the lines that you draw. You can adjust the size of the heads by using the Width and Length boxes. You can adjust the backs of the heads with the Concavity field. The higher the Concavity, the sharper the barbs will be on the back of the arrowheads, ranging from –50% to 50%. The arrowheads were missing in Photoshop for a while, but they’re back now.
This tip originally published in Colin Smith’s “Photoshop Tips” column in the March, 2023 issue of Photoshop User magazine.