Make sharp linework with the power of pixels. Try the almighty brush. The Brush tool is one of the most indispensable tools in Photoshop for creating lines. Adjust weight, hardness, size, or color to suit your needs, and then paint as if with a real brush. Draw the perfect line. To work as if with a ruler, the Line tool is at the ready.

Click on the canvas, drag, and release to create a line. To constrain the line angle to a multiple of 45 degrees, hold down shift as you drag and draw the line.