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Free online ukulele tuner
A precise tuner for your ukulele, right in your browser: re-entrant GCEA, low G and baritone DGBE, to the cent.
- No account
- No ads
- Nothing to install
In short
To tune a ukulele online, allow the microphone, pick Ukulele and pluck each string: G4 (392 Hz), C4 (261.63 Hz), E4 (329.63 Hz) and A4 (440 Hz). The G is re-entrant: it sounds higher than the C. Center the needle within ±5 cents. Low G and baritone DGBE are built in too.
- 3 tunings: standard GCEA (re-entrant), low G (G3 at 196 Hz) and baritone DGBE.
- Soprano, concert and tenor are all tuned GCEA: one preset for all three.
- Baritone follows the top 4 strings of a guitar: D3, G3, B3, E4.
- In-tune zone of ±5 cents, a reference note in a ukulele voice, free and no account.
The Jam Jam online ukulele tuner listens through your microphone and tells you, string by string, whether you are sharp or flat, to the cent. Three tunings are built in: standard GCEA, whose 4th string is re-entrant (it sounds higher than its neighbours, A4 E4 C4 G4), low G, which drops that string an octave to G3 for more bass, and baritone DGBE, tuned like the top four strings of a guitar. The reference note plays in a ukulele voice, not a piano. Once you are in tune, 89 ukulele fingerings written one by one are waiting in the same app.
How to tune a ukulele online
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Allow the microphone
Open the tuner, pick Ukulele and allow the mic: the audio is analysed on your device and nothing is uploaded.
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Pick your tuning
Standard GCEA, low G if your fourth string is a thick wound one, or baritone DGBE on a larger ukulele.
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Pluck one open string
Play a single string. The nearest of the four locks on by itself; a tap freezes one string instead if you prefer.
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Centre the needle
Turn the peg until the needle sits inside ±5 cents and turns green, then work through all four strings.
How to tune a ukulele
- Hold the ukulele as if to play and find string 4, closest to your chin: in GCEA it is a high G, not a low one.
- Tune A4 (440 Hz) first, the string closest to the floor, then E4, C4 and G4.
- Turn the tuning pegs gently: on a ukulele, a quarter turn changes the note a lot, especially with nylon strings.
- New strings stretch for several days: retune often at first, that is normal.
- Check by ear with a C chord (3rd fret on the A string): it should ring clear, with no buzz.
Ukulele tunings: notes and frequencies
| Tuning | String 1 | String 2 | String 3 | String 4 |
|---|---|---|---|---|
| Standard GCEA (re-entrant, high G) | A4440.00 Hz | E4329.63 Hz | C4261.63 Hz | G4392.00 Hz |
| Low G (linear) | A4440.00 Hz | E4329.63 Hz | C4261.63 Hz | G3196.00 Hz |
| Baritone DGBE | E4329.63 Hz | B3246.94 Hz | G3196.00 Hz | D3146.83 Hz |
Built for the ukulele, not adapted to it
Re-entrant GCEA, finally explained
Standard uke tuning is re-entrant: the fourth string, G4, sounds higher than the C4 beside it. The tuner shows each string’s real octave, no G3 by mistake.
Low G and baritone included
Switch to low G (A4 E4 C4 G3) for a linear range, or to baritone DGBE (E4 B3 G3 D3): the three tunings a ukulele actually uses, no chromatic guesswork.
Auto string lock, or manual
It settles on the nearest of the four strings by itself. Two strings too close together? A tap freezes one, a second tap goes back to automatic.
A reference note that sounds like a uke
Tap a string to hear its target pitch played for 1.5 s in a ukulele voice: far easier to match by ear than a piano tone.
Why tune your ukulele here
- 3 tunings: standard GCEA, low G and baritone DGBE
- In tune within ±5 cents, cents to the unit and frequency to 0.1 Hz
- Free in your browser, no sign-up, no ads, nothing to install
- Chromatic mode from 40 to 1600 Hz for everything else
A single-purpose tuner site stops the second your ukulele is in tune. Here it is just one tab among others: detection names the chords you strum, the notebook keeps the song, and the diagrams draw 89 ukulele fingerings written one by one on a 12-fret neck, with a capo from 0 to 12. Everything is computed in your browser by a local audio worklet (the mic is even requested without noise suppression or automatic gain control, two kinds of processing that would skew the pitch) and the Android app does the same offline.
Tune my ukulele →Related guides
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Ukulele tuner FAQ
Is this ukulele tuner free?
Yes: free, with no sign-up and no ads. Everything happens in your browser: pitch detection runs in a local audio worklet, so nothing you play is uploaded, and the Android app tunes offline.
What is re-entrant GCEA tuning?
It is the standard ukulele tuning. A4 E4 C4 G4. The fourth string sounds higher than the third instead of lower, so the strings do not run from low to high. That is exactly where the bright, jangly uke sound comes from.
Low G or high G: which should I pick?
High G (standard GCEA) keeps the re-entrant chime and suits strumming; low G drops that string an octave, so your lowest note becomes G3 instead of C4: handy for melody and fingerpicking. One tap separates the two.
Do soprano, concert and tenor ukuleles use the same tuning?
Yes: soprano, concert and tenor are tuned GCEA (G4 C4 E4 A4), re-entrant or low G depending on the string fitted. Only the baritone differs: D3 G3 B3 E4, like the top four strings of a guitar.
Why does my G string sound higher than the C?
That is re-entrant tuning: the 4th string is tuned to G4, an octave above the low G. It therefore sounds higher than the 3rd string, C4. If your G string is a thick wound string, pick the low G preset (G3, 196 Hz).
Can I tune a ukulele to D (A D F♯ B)?
Jam Jam has no preset for D tuning. The chromatic mode names every note you play: you can aim for A4, D4, F♯4 and B4 string by string.