Free · Any instrument
Online Tuner
A free online chromatic tuner for any instrument. It listens through your microphone, names the nearest note and shows how many cents sharp or flat you are. Pick your instrument to hear its open strings and see which one you're tuning: guitar, ukulele, violin, viola, cello, bass, mandolin or banjo. Voices, winds and brass can use it too. Set the reference A from 415 to 466 Hz.
- 8instrument presets
- 415–466Hz reference A
- ±1cent precision
Tune Any Instrument Online
Tap Start tuner and allow the microphone. Play or sing one note and hold it. The tuner names the note and shows how far it is from true pitch. Pick an instrument to hear its strings and see which one you're on.
Tap Start tuner, allow the microphone, then play one string.
Teaching? Put this online tuner on your class site, free. Get the embed code
Standard Tunings for Every Instrument
The open-string notes and their frequencies at A = 440 Hz for every instrument in the tuner. Choose one in the Instrument menu above to hear its strings, and to have the tuner show which string you're playing.
Guitar: E A D G B E
Standard tuning, low to high: E A D G B E. From the thickest string, the strings are a fourth apart, except G to B, which is a major third. Remember it as “Eddie Ate Dynamite, Good Bye Eddie”.
- E2
- 82.41 Hz
- A2
- 110.00 Hz
- D3
- 146.83 Hz
- G3
- 196.00 Hz
- B3
- 246.94 Hz
- E4
- 329.63 Hz
Ukulele: G C E A
G C E A for soprano, concert and tenor, with the G tuned high (re-entrant). Open the Ukulele Tuner →
- G4
- 392.00 Hz
- C4
- 261.63 Hz
- E4
- 329.63 Hz
- A4
- 440.00 Hz
Violin: G D A E
G D A E in perfect fifths, tuned from the A. Open the Violin Tuner →
- G3
- 196.00 Hz
- D4
- 293.66 Hz
- A4
- 440.00 Hz
- E5
- 659.26 Hz
Viola: C G D A
C G D A, a fifth below the violin and an octave above the cello.
- C3
- 130.81 Hz
- G3
- 196.00 Hz
- D4
- 293.66 Hz
- A4
- 440.00 Hz
Cello: C G D A
C G D A in perfect fifths, an octave below the viola. Open the Cello Tuner →
- C2
- 65.41 Hz
- G2
- 98.00 Hz
- D3
- 146.83 Hz
- A3
- 220.00 Hz
Bass guitar: E A D G
E A D G, the guitar's four lowest strings an octave lower. Upright bass uses the same pitches. Open the Bass Tuner →
- E1
- 41.20 Hz
- A1
- 55.00 Hz
- D2
- 73.42 Hz
- G2
- 98.00 Hz
Mandolin: G D A E
G D A E like the violin, in four pairs of strings. Tune both strings of each pair to the same note.
- G3
- 196.00 Hz
- D4
- 293.66 Hz
- A4
- 440.00 Hz
- E5
- 659.26 Hz
Banjo (5-string, open G): G D G B D
g D G B D. The short 5th string is the high g, played with the thumb; strumming the open strings gives a G major chord.
- G4
- 392.00 Hz
- D3
- 146.83 Hz
- G3
- 196.00 Hz
- B3
- 246.94 Hz
- D4
- 293.66 Hz
How to Use This Online Tuner
A chromatic tuner reads any of the twelve notes, so it works for any instrument, and for voices.
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Pick your instrument
Choose it in the Instrument menu. The tuner still reads every note, but it also lights the string you're playing and lets you hear each string's target note.
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Start the tuner
Tap Start tuner and allow the microphone when your browser asks. Hold your phone or laptop near the instrument, in a quiet room if you can.
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Play one note and hold it
Pluck, bow, blow or sing a single steady note. The tuner names the nearest note, with its octave, and shows how many cents sharp or flat you are.
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Adjust until it's green
Needle left (Tune up): raise the pitch. Needle right (Tune down): lower it. Within 5 cents the display turns green. Hold it there for a moment and the string gets a tick.
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Match your group's A
If you're playing with a piano or a band that's slightly sharp or flat, play their A and move the reference A until the tuner reads it as in tune. Then tune everything else to that.
How to Tune by Ear with Reference Tones
No microphone, or a room too noisy for one? Every string in the presets plays its note when you tap it, so you can tune by ear.
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Play the target note
Choose your instrument and tap the string you want to tune. On plucked instruments, turn on Repeat the tone so it replays every two seconds.
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Play your string with it
Play the same string on your instrument while the tone sounds. Two notes that are close but not the same make a slow wobble, called beating.
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Turn until the beating stops
Turn the peg slowly. The beating speeds up as you move away from the note and slows as you get closer. When it stops, the two notes are the same.
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Repeat for each string
Tune every string the same way, then play a chord or two. If one string sounds sour against the others, tune it again.
What This Chromatic Tuner Does
A full chromatic tuner, with string presets and reference tones for the instruments people tune most.
Every note, from 27 Hz to 2 kHz
The tuner reads any of the twelve notes from a 5-string bass's low B to the top of a violin. It names the note with its octave, so you know when a string is a whole octave off.
Start tuning-
Finds the fundamental, not the overtone
The pitch detector looks for the longest repeating period in the sound, the fundamental. That avoids the octave jumps that trip up simpler tuners on bright, harmonic-rich strings.
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Eight instrument presets
Guitar, ukulele, violin, viola, cello, bass, mandolin and banjo. Pick one and the tuner lights the string you're playing and plays each string's target note.
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Cents and hertz
The needle shows how far off you are, and the readout gives exact cents and both frequencies. The display turns green within 5 cents.
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Adjustable reference A
440 Hz by default, adjustable from 415 (baroque) to 466 Hz in 1 Hz steps. Your choice is remembered.
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Microphone processing switched off
Browsers clean up the microphone for video calls, which flattens and filters a held note. The tuner turns that processing off so it hears your instrument as it is.
If the Tuner Won't Read Your Note
It shows the right note in the wrong octave
The octave number tells you which octave the tuner heard: A4 is 440 Hz, A3 is 220 Hz. A strong overtone can sometimes win on a bright instrument. Play more softly, or pluck nearer the middle of the string.
The needle won't settle
Play one note at a time and stop other strings ringing. Read the needle after the attack: every plucked note is slightly sharp at first. A steady, held note gives the steadiest reading.
The browser didn't ask for the microphone
Look for a camera or microphone icon in the address bar and set it to Allow, then tap Start tuner again. On iPhone, open Safari's page settings (the aA icon) and allow the microphone for this site.
Very low notes don't register
Most phone and laptop microphones barely hear notes below about 60 Hz, which covers a bass's low E and B. Play the 12th-fret harmonic, an octave higher, or use the bass tuner, which reads harmonics as the open string.
Wind and brass players
Choose any instrument. The chromatic reading works for every note, so ignore the string buttons. Remember that the tuner shows concert pitch. A B♭ clarinet or trumpet playing a written C sounds a B♭ on the tuner.
Free, in Your Browser
- Nothing to install Runs in Chrome, Safari, Edge and Firefox on a phone, tablet or computer. No app, no plugin.
- Sound stays on your device The microphone is analysed in your browser. No audio is recorded, uploaded or stored.
- No account No sign-up and no limits. Open the page and tune.
- Works without a mic Every preset plays its strings' notes, so you can tune by ear.
Tuner Questions
What is a chromatic tuner?
A tuner that recognises all twelve notes of the chromatic scale, not just an instrument's open strings. It tells you the nearest note and how far off you are, so it works for any instrument, any tuning and the voice.
How accurate is an online tuner?
The pitch maths here is accurate to well under a cent, which is finer than anyone can hear. In practice, accuracy depends on a clean signal: one note at a time, a quiet room, and the microphone reasonably close. Under those conditions it matches a good clip-on tuner.
What does cents mean on a tuner?
A cent is one hundredth of a semitone. 0 cents is exactly in tune, −20 means a fifth of a semitone flat, and +50 is halfway to the next note. Most people can't hear a difference below about 5 cents on a held note, which is why the tuner turns green within ±5.
Should I tune to 440 Hz or 432 Hz?
440 Hz is the international standard for A, and nearly all modern music, instruments and recordings use it. 432 Hz is about 32 cents flat and has no acoustic advantage. Use it only to match a recording or group tuned there. The reference control goes as low as 415 Hz.
How do I tune a guitar with this tuner?
Leave the Instrument menu on Guitar. The strings, from the thickest, are E A D G B E (E2, A2, D3, G3, B3, E4). Pluck each open string, tune it until it's green, then check all six again.
Does it work for singing?
Yes. Sing and hold one vowel, and the tuner shows the note and how far off it is. It's a quick way to check your pitch on long notes.
Why doesn't the browser ask for the microphone?
The microphone only works on secure (https) pages, and only after you tap Start tuner. If you blocked it once, the browser remembers. Allow it again from the icon in the address bar, or in Safari's website settings on iPhone.
Is my audio recorded?
No. The sound is analysed in your browser, frame by frame, and thrown away. Nothing is recorded, uploaded or stored, and the microphone switches off when you tap Stop or leave the tab.