Binding is one of the final jobs when you are finishing a quilt. In order to make the quilt binding look smooth and even around the entire quilt perimeter, you will need to miter the binding at each corner. Mitering is the process of folding the binding a certain way to make a neat, diagonal crease from the corner of the quilt outward. This gives each corner of the quilt a sharp and squared-off look, creating a tidy edge with a finished style.
Pin the binding to the top edge of the quilt on the front side, beginning in the middle of the quilt edge and going toward the right corner.
Stitch the binding to the quilt, using a 1/4-inch seam allowance. Begin the stitching 10 inches from the start of the binding, leaving a 10-inch tail hanging free. Stop stitching 1/4 inch from the right edge.
Turn the quilt 45 degrees so that the needle is aimed at the corner. Stitch from your stopping point to the corner of the quilt. This will be a very short diagonal stitch line. Clip the threads and remove the quilt from the sewing machine.
Lay the quilt on the table in front of you with the edge with the binding at the top. Grasp the loose piece of binding to the right of the quilt and fold it upward so that it's parallel with the right edge of the quilt.
Fold this same strip back downward, leaving the first fold in place. Lay the strip along the right edge of the quilt and pin it in place. You will have a diagonal fold in the binding where you placed the two folds.
Stitch the binding from the upper right corner down toward the lower right corner. You now have a mitered corner that will create a neat diagonal crease when you flip the other half of the binding toward the back of the quilt. Continue stitching the binding all around the edge of the quilt, making a miter on each of the other three corners.