A cord tightening tool used to tighten elongated flexible cord includes a frame with each outer end having a saddle that attaches to a cord to be tightened. A hook with a swivel mount is provided in a center of the frame that attaches to the cord between the saddles. A threaded shaft connected to the hook can be rotated to pull the cord downward to remove slack. The saddles and hook are interchangeable with different shapes to be used with various types of cord materials.