A guitar capo is a tool that mounted onto frets of a guitar to adjust high and low pitches. However, a traditional one is hard to remove and clip on while adjustment of tune sitting is needed. Therefore, our aim was to provide a capo that can be quickly and easily moved and clamped on the frets of a guitar. To achieve the foregoing object, the “fast-fit capo” includes a string press element, a trigger and a lever clamp. By using these elements, the capo can be quickly and easily deployed by a user single-handed through the trigger during playing the guitar.