Free Online Ukulele Tuner

A ukulele tuner is an electronic device, mobile application, or browser-based software tool that detects the vibration frequency of each ukulele string and indicates whether the pitch is flat (too low), sharp (too high), or perfectly in tune.

Tuners measure pitch in Hertz (Hz) and cents deviation, comparing your instrument against standard reference frequencies: G4 (392.00 Hz), C4 (261.63 Hz), E4 (329.63 Hz), and A4 (440.00 Hz). Modern tuners operate in two main formats:

• Microphone Tuners (like UkuleleTuners.com): Capture acoustic sound through your phone or laptop mic with zero hardware required.
• Clip-On Vibration Tuners (like the Snark SN6X): Attach directly to your headstock to read mechanical vibrations through the wood, ignoring room chatter.

Tuning your ukulele with a tuner takes under two minutes following these 5 steps:

1. Activate your tuner: Launch our free online mic tuner at UkuleleTuners.com or clip your digital tuner to the headstock.
2. Know your strings: Facing your ukulele, string 4 (top, closest to your face) is G, string 3 is C, string 2 is E, and string 1 (bottom) is A (remember: Good Chefs Eat Apples).
3. Pluck an open string: Pluck string 4 (G) cleanly with your thumb and allow the note to ring for 2 seconds.
4. Read the pitch indicator:
   • If the indicator is flat (left / amber): Tighten the tuning peg to raise the pitch.
   • If the indicator is sharp (right / rose): Loosen the peg to lower the pitch.
5. Center on green: Make tiny 1/8-turn adjustments until the needle locks in the center. Repeat for the C, E, and A strings.

Pro-tip: Always tune up to the pitch. If your string is sharp, drop it below target first, then tighten upwards into pitch to lock the gear teeth firmly.

If you have just unboxed your first instrument, here is the golden beginner walkthrough:

• Trace the string first: Beginners frequently turn the wrong peg by mistake. Run your index finger along the string from the bridge to the headstock to verify you are turning the matching machine head.
• Start with the C string: Pluck String 3 (C4). It is the lowest fundamental tone on standard ukuleles and the easiest for beginners and tuners to recognize.
• Turn pegs in micro-increments: Ukulele tuning pegs are sensitive. A small quarter-turn changes the pitch significantly. Never force a peg if it feels stuck.
• Listen while watching the screen: Connect the visual needle with what your ears hear. As the needle moves toward center, notice the pitch getting clearer and brighter.
• Repeat after 5 minutes: Brand-new nylon strings stretch rapidly. Retune once more before your first practice song.

Using a ukulele tuner accurately depends on the type of tuner you choose:

Electric tuners encompass clip-on digital devices, handheld chromatic tuners, and pedalboard tuners:

1. Check calibration: Verify the display shows A = 440 Hz. If it accidentally shifts to 442 or 438 Hz, your ukulele will sound out of tune when playing with other instruments.
2. Choose your input method:
   • Acoustic ukuleles: Use the built-in mic or clip-on piezo sensor.
   • Acoustic-Electric ukuleles: Plug a 1/4" guitar cable from the endpin jack directly into the tuner's IN jack for silent, 100% interference-free tuning on stage.
3. Select Chromatic or Ukulele Mode: On multi-instrument electric tuners, toggle the mode button until it displays "U" (Ukulele) or "C" (Chromatic).
4. Tune until LED turns green: Electric tuners illuminate amber/red when flat or sharp, and bright green when locked in tune within +/- 1 cent.

When you are outdoors, at a campfire, or your phone battery dies, you can tune your ukulele relative to itself using the 5th-Fret Relative Tuning Method:

Read our in-depth Relative Tuning Tutorial with fret diagrams.

Yes, absolutely—with one simple setting check:

• Switch to Chromatic Mode ('C'): Most clip-on guitar tuners (like Snark, Fender, or D'Addario) have a small mode button that cycles through G (Guitar), B (Bass), V (Violin), U (Ukulele), and C (Chromatic). If your tuner does not have a dedicated "U" mode, switch it to "C" (Chromatic). In chromatic mode, it detects all 12 notes in the musical scale, including ukulele G, C, E, and A.
• Why Guitar Mode alone doesn't work for standard uke: Standard guitar mode is strictly programmed to listen for E2, A2, D3, G3, B3, and E4. When you pluck your ukulele's C-string, a guitar-only tuner gets confused because guitars have no open C string.
• Baritone Ukulele Shortcut: If you play a Baritone Ukulele (DGBE), you can use a guitar tuner in standard Guitar mode directly! The 4 baritone strings are tuned identically to strings 4 (D), 3 (G), 2 (B), and 1 (E) of a standard guitar.

Based on accuracy, ease of use, and response speed, here are the top ukulele tuners available:

Tuning instability is the #1 complaint of new ukulele players. The issue is almost always one of three physical factors:

• Nylon String Elasticity: Unlike steel guitar strings, ukulele nylon and fluorocarbon strings have high elasticity. Brand new strings will stretch and drop flat every few minutes for the first 3 to 7 days.
  Quick Fix: Gently hook two fingers under each string at the 12th fret, lift it 1/2 inch away from the fretboard, and tune back up. Repeat 3 times to accelerate string settling.
• Slipping Machine Head Screws: On both friction pegs and open-gear tuners, the small screw holding the gear or button can loosen over time. Use a small Phillips-head screwdriver to tighten the peg screw by 1/4 turn to add holding friction.
• Temperature & Humidity Shocks: Ukuleles are delicate instruments made of thin tonewoods. Moving between an air-conditioned room and warm outdoors causes strings and wood to expand or contract. Store your uke in a padded case when not in use.

Yes! UkuleleTuners.com is 100% free to use. There are no subscriptions, no accounts required, and no locked features. You get full access to Standard gCEA, Baritone DGBE, and Low G modes with unlimited microphone pitch detection.

Yes! You can bookmark UkuleleTuners.com on your iPhone, iPad, or Android home screen. It functions as a lightweight Progressive Web App (PWA) with zero storage footprint and no app store updates required.

A digital tuner actively listens to your specific instrument and shows you which direction to turn your peg. A YouTube clip simply plays a sound file—it cannot tell you if you are flat, sharp, or accidentally an entire octave too high.