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Free · uses your mic

Online tuner

Tap Start tuner, allow the microphone and play or sing one note. The tuner names the nearest note and how many cents flat or sharp it is, tune up or tune down, until it reads In tune. It tunes any instrument, at A4 = 440 Hz or the pitch you pick.

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Tap Start tuner, then play a note

Any note, tuned to A4 at 440 Hz.

The mic is on only while the tuner is, and what it hears stays in this browser.

Tune an instrument

Each instrument’s tuner knows its strings: it lights the one you play and tunes it to its note, in standard tuning or another you pick.

Guitar tuner

E A D G B E

Standard, drop D, open G, DADGAD and ten more.

Bass tuner

E A D G

4-string, 5-string with a low B, drop D and 6-string.

Ukulele tuner

G C E A

Standard G C E A, low G, baritone and D tuning.

Violin tuner

G D A E

G D A E, with the A at 440 Hz, and two cross tunings.

Viola tuner

C G D A

C G D A, a fifth below a violin.

Cello tuner

C G D A

C G D A, an octave below a viola.

Banjo tuner

G D G B D

Open G, double C, open D, G modal and tenor banjo.

Mandolin tuner

G D A E

G D A E like a violin, mandola and octave mandolin.

How to use the online tuner

Start the tuner

Tap Start tuner and allow the microphone, close to your instrument or your voice, in a quiet room.

Play one note

Play or sing a single note and hold it. The tuner names the nearest note, with its octave, and how far off it is.

Tune up or down

Flat means too low: tune up. Sharp means too high: tune down. Stop when it reads In tune, within 5 cents of the note.

Pick your instrument

For a guitar, ukulele, violin or another below, its own tuner knows its strings and lights the one you play.

Flat, sharp and cents

The needle sits in the middle when the note is in tune. Left of it the note is flat, too low, so tune up; right of it the note is sharp, too high, so tune down. The distance is in cents, hundredths of a half step: the needle reaches the end at 50 cents, halfway to the next note, and the tuner reads In tune within 5 cents.

The pitch of every note, at A440 and at 432 Hz, is on the note frequency chart.

Questions about the tuner

What is a chromatic tuner?

A tuner that hears any of the twelve notes, not only an instrument’s open strings. It names the nearest note to what you play, with its octave, and how many cents flat or sharp it is, so it tunes any instrument or a voice.

What do flat and sharp mean on a tuner?

Flat is below the note, so tune up; sharp is above it, so tune down. The needle sits left of the middle when flat and right of it when sharp.

What are cents?

A hundredth of a half step. A note 50 cents off is halfway to the next note; within about 5 cents most ears hear it as in tune.

What is A440, and why would I change it?

A440 is the standard pitch: the A above middle C at 440 hertz, with every other note set from it. Some orchestras tune a little higher, to 442 or 443, and some players prefer 432; pick one above and the tuner tunes every note to it.

Is my sound recorded or sent anywhere?

No. The tuner listens in your browser and works out the pitch on your device. Nothing is recorded, saved or sent, and it stops listening when you tap Stop tuner or leave the page.

Play along with a beat

Tuned up? Open the free editor with a beat in A minor playing and play along, then add a melody, a bass line or your voice, part by part. No account needed to start.

Start a beatInstrument tunings

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