Pick a sturdy object in the size of desired length for the fringes. I have used a plastic pencil box, but a cardboard can work the same.
Wrap the yarn around the object.
Cut the yarn with scissors on one side.
Take two pieces of cut yarn and bend in half. With a crochet hook pull about half of the yarn through the edge of scarf. Pull the ends of yarn through the eye and make a knot.