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Online guitar tuner

Press Start, allow the microphone and play a string. The needle shows if you're flat or sharp; centre it and you're in tune.

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Press Start tuner and allow the microphone.

Tap a string to hear its note and lock onto it

The sound is analysed on your device. Nothing is recorded or uploaded.

The tuner listens through your device's microphone and measures the pitch of each note many times a second. The big letter shows the nearest string or note, and the needle shows how far off you are in cents (hundredths of a semitone). When the needle sits in the green centre and the note turns green, the string is in tune.

Choose standard guitar tuning (E A D G B E) or Drop D, half a step down, DADGAD and Open G. There are also settings for 4- and 5-string bass, ukulele and violin, and a chromatic mode for any instrument. In auto mode the tuner picks the closest string for you; tap a string to lock onto it and hear its reference note, which also lets you tune by ear without a microphone.

Everything happens in your browser. The sound is analysed on your device and is never recorded or sent anywhere.

How to use it

  1. Press Start tuner and allow microphone access when your browser asks.
  2. Play one string at a time and let it ring.
  3. Turn the tuning peg until the needle is centred and the note turns green. Tune up means tighten the string; Tune down means loosen it.

Frequently asked questions

The tuner says the microphone is blocked. What do I do?
Your browser was told not to let this site use the microphone. Click the lock or settings icon next to the web address, set Microphone to Allow, then press Try again. On a phone, also check in the system settings that your browser may use the microphone.
What is standard guitar tuning?
From the thickest to the thinnest string: E2, A2, D3, G3, B3, E4. With A = 440 Hz that is 82.4, 110, 146.8, 196, 246.9 and 329.6 Hz. A common way to remember it: Eddie Ate Dynamite, Good Bye Eddie.
Why does the needle jump around?
Pluck firmly, mute the other strings and tune in a quiet room. The first moment of a note is noisy, so watch the needle once the string rings steadily. Old strings can also struggle to hold a clear pitch.
Should I tune up or down to the note?
Tune up to it. If a string is sharp, loosen it below the note first and then bring it up: the gear stays under tension and the string holds its tuning better.
Can I change the reference pitch?
Yes. A4 = 440 Hz is the standard, but you can choose from 415 to 446 Hz, for example 442 Hz to match an orchestra, or 432 Hz.

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