Free tool

Online Guitar Tuner

Tune your guitar with your microphone in standard tuning (E A D G B E), or tap a string to hear its reference tone.

Start the tuner and play a string

Reference tones

Standard tuning, lowest to highest. Click a string to play it; the string the mic hears is highlighted.

Click Start tuner and allow microphone access. The needle centers and turns green when a string is in tune (within 5 cents).

No microphone? You can still tap any string above to hear its exact reference pitch.