This is a visual tool for charting chords. Simply click anywhere on the fretboard to place a fret marker. To mark an open string, click on the nut (the zeroth fret). To mark a muted string (X), click twice anywhere on the string. To switch to a vertical view, resize your browser window or flip your phone sideways. To hear how the chord sounds strummed, press the play button. There are some sound settings that you can adjust. To save your work, right click on the picture and select "save image as..."