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Online Guitar Tuner

Listens to a string through your mic and shows whether it is sharp or flat. Ukulele too.

This tuner works out the pitch of the sound your mic hears. It reads best in a quiet room with one string at a time, and the mic and background noise can add some error.

InstrumentStandard tuning E A D G B E

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String
Reference A4Hz430–450 Hz

Press Start microphone and pluck one string. You'll see which note it is closest to and how many cents sharp or flat it is. When the needle sits in the green middle zone, the string is in tune. Strings are detected automatically, or pick one to tune against that string only.

How to use

  1. Pick your instrument and press Start microphone.
  2. Pluck one string in a quiet spot.
  3. Tighten or loosen until the needle reaches the green middle zone. Play tone plays the reference note for that string.

Examples

String 5 (A2), 110 Hz

In standard tuning, string 5 (A2) should be 110 Hz. At 108 Hz it is about 32 cents flat, so tighten it. At 111 Hz it is about 16 cents sharp, so loosen it a little. If you change the A4 reference to 432 Hz, the same string's target becomes 108 Hz.

MetronomeA steady click at the BPM and time signature you set, with tap tempo.Mic TestSpeak and the bar moves. Record a few seconds and hear it back.Sound MeterA rough decibel reading from your mic. Uncalibrated, for reference only.Speaker TestPlay a test tone left, right or both to check sound and direction.

FAQ

Is my mic sound recorded or sent anywhere?

No. The mic sound is only used to work out the pitch; it is not saved, sent or played back through the speakers. Press Stop and the mic turns off.

How do I read cents and the needle?

A cent is one hundredth of a semitone. A needle on the left means the note is flat, so tighten the string; on the right means sharp, so loosen it. Within 5 cents counts as in tune and turns green.

Can I tune a ukulele too?

Yes. Choose Ukulele and it tunes to standard G C E A. In this tuning the G on string 4 is higher in pitch than the C on string 3, so don't be surprised by that.

What is the A4 reference, and can I change it?

A4 is the A note that sets the pitch of all the other notes. It is usually 440 Hz, and you can change it between 430 and 450 Hz if the instrument you play with is tuned to a different value.

It isn't picking up my string. What should I do?

Pluck one string at a time in a quiet room and keep the mic close to the instrument. Music or other instruments playing at the same time make it hard to read. Detection pauses while Play tone is sounding, so stop the tone before you pluck.

How accurate is it?

It is not a precision instrument. The mic, your device and background noise can shift the reading by a few cents, so use it for everyday tuning. Play tone can sound quiet on low strings depending on your speakers.