Free · No download · Any device
Free Online Guitar Tuner
The tuner listens through your microphone.
Tune your guitar with your device’s microphone. Play any string and FretPitch shows the note and exactly how far off it is — in standard tuning, Drop D, DADGAD and seven more.
- Accurate to about a hundredth of a semitone
- Chromatic mode for any note, plus 10 guitar tunings
- Works on phones, tablets and computers
- No app or account needed
How to use the tuner
Three steps, about a minute per guitar. New to tuning? Read the step-by-step guide.
Press “Start tuning”
Allow microphone access when your browser asks. Choose a tuning under Tunings, or stay in Chromatic mode.
Pluck one string
Let it ring. The big letter shows the note (or the string of your tuning) and the needle shows how far off it is.
Turn the peg until it’s green
Needle left means flat — tighten the string. Needle right means sharp — loosen it. Green means in tune.
Standard guitar tuning: E A D G B E
Most songs use standard tuning. From the thickest string to the thinnest, the notes are E, A, D, G, B and E, and these are the frequencies the tuner aims for:
| String | Note | Frequency |
|---|---|---|
| 6th (thickest) | E2 | 82.41 Hz |
| 5th | A2 | 110.00 Hz |
| 4th | D3 | 146.83 Hz |
| 3rd | G3 | 196.00 Hz |
| 2nd | B3 | 246.94 Hz |
| 1st (thinnest) | E4 | 329.63 Hz |
More about it on the standard tuning page.
Alternate tunings
Each tuning has its own page with the notes, frequencies, how to get there from standard, and a tuner already set to it.
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D A D G B E
Drop D
Standard tuning with the low E lowered a whole step to D — heavier riffs and one-finger power chords.
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E♭ A♭ D♭ G♭ B♭ E♭
Half Step Down (E♭)
Every string lowered one semitone — slinkier strings and a darker tone, loved by blues and rock players.
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D G C F A D
Full Step Down (D Standard)
All six strings lowered a whole step — D G C F A D — for a big, heavy sound with familiar chord shapes.
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C G C F A D
Drop C
D standard with the low string dropped another whole step to C — the heavy sound of modern rock and metal.
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D A D G A D
DADGAD
An open, ringing modal tuning from Celtic and folk music that also made its way into rock.
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D G D G B D
Open G
Strum the open strings and you hear a G major chord — the classic sound of slide guitar and Stones riffs.
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D A D F♯ A D
Open D
The open strings form a D major chord — full, resonant and ideal for slide and fingerstyle folk.
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E B E G♯ B E
Open E
An E major chord on the open strings — a bright slide-guitar tone, with some strings tuned up instead of down.
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C G C G C E
Open C
A low, rich C major chord on the open strings — a deep, piano-like tuning for fingerstyle and ambient playing.
Frequently asked questions
Is this guitar tuner free?
Yes. It is completely free, with nothing to download and no account. It works in any modern browser on a phone, tablet or computer.
Why does the tuner need my microphone?
To hear your guitar. The tuner only listens after you press Start tuning and allow access in your browser, and you can turn access off at any time in your browser settings. The tuner does not record audio — see the privacy policy.
Why doesn’t the tuner react when I play?
Make sure you allowed microphone access (look for a microphone icon in the address bar), that no other app is using the microphone, and that you are close enough to it. Pluck one string firmly and let it ring.
How accurate is it?
In our tests the pitch detection is accurate to about one cent — a hundredth of a semitone. The display counts anything within ±5 cents as in tune, which is finer than most people can hear.
What is chromatic mode?
Chromatic mode shows the nearest of all twelve notes, whatever you play. Use it when your guitar is far out of tune, or for any tuning that is not in the list. Choose a preset under Tunings and the tuner will instead name the string you are tuning.
Can I tune a ukulele, violin or bass with it?
Chromatic mode works for any instrument whose notes fall between about 62 Hz and 1000 Hz — ukulele, mandolin, violin and voice included. The lowest strings of a bass guitar are below that range, so bass is not supported yet.
Why does it show D when I play my low E string?
You have a tuning such as Drop D selected, where the lowest string is D — the tuner is telling you to tune down. Switch to Standard or Chromatic if you want standard tuning.