MotionShine01 / Listen
Start the tuner
Allow the microphone and sit close to it in a quiet room.
Free tool
Guitar tuner, with your microphone.
Play a string and the tuner shows the note and how far off it is, in cents. It picks the nearest string for you, or tune one string at a time. Standard, drop D, DADGAD, open G, half step down, bass and ukulele, with a reference tone for each string if you prefer to tune by ear.
The browser asks to use the microphone. Sound stays on your computer.
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Play a string
Auto: the tuner picks the string nearest to what you play.
Tune by ear
Click a string under the dial to hear its note, then match it.
Pitch is measured in your browser. The sound is never recorded or uploaded.
How to tune
Three steps, one string at a time.
02 / Pluck
Play one string
Pluck it once and let it ring. Mute the other strings with your hand.
03 / Turn
Centre the needle
Left is flat, so tighten. Right is sharp, so loosen. Green means in tune.
Questions
Good to know.
What is standard guitar tuning?
From the thickest string to the thinnest: E2, A2, D3, G3, B3, E4. A common way to remember it is "Eddie Ate Dynamite, Good Bye Eddie".
What are cents?
A cent is one hundredth of a semitone. Within about 5 cents most ears hear a string as in tune, so the dial turns green there.
Why does the reading jump around?
Background noise, other strings ringing, or a very soft pluck. Mute the other strings, pluck firmly once and read the note while it rings. Low bass strings need a moment longer.
What is A4 = 440 Hz?
The pitch the whole tuning is built on. 440 Hz is the usual standard; some orchestras use 442, and some players prefer 432. Change it only if you play along with something tuned that way.
Does it work on a phone?
Yes, in a current browser that can use the microphone. Keep the screen on while you tune.
Is my sound recorded?
No. The tuner measures the pitch in this tab and keeps nothing.