Play guitar online
Use your computer keyboard or click on the guitar strings to play the guitar. The four rows of keys on your keyboard correspond to the four lowest strings on the guitar. Press and hold the shift key (⇧) and use the top two keyboard rows, to play the top two strings.
Click "Highlight" above the guitar to show note names. Click "Sounds" to choose between different guitar sounds. Click "Mark" to mark notes on the fretboard as you click on each one. Press and hold the alt key on your keyboard to mark notes with ♯ instead of ♭. Play the marked notes by clicking "Play" or pressing the spacebar on your keyboard.
Save your markings on the guitar by copying the web address in your browser. This also allows you to share your markings with others. For example, here is a C major seventh chord and an E major scale.
Online guitar tuner
Click the "Tuner" button to activate the tuner. Click the string you want to tune and play the corresponding string on your guitar so the two notes sound together.
If your string is slightly out of tune, you will hear a pulsating sound between the two notes. As you tune the string, the pitches get closer and the pulsation slows. When the two notes match perfectly, the pulsation stops and the two notes sound, as one.