Tech Tools / Music / Guitar Tuner
Guitar Tuner
Tune a guitar, bass, or ukulele from your phone or laptop. Pitch is detected in the browser. The microphone is requested only when you press Start, and the audio never leaves this device.
The tuner needs the microphone to hear your instrument. Permission is requested only when you press Start tuner. Audio is processed in this browser and is not uploaded or recorded.
Microphone is off.
—
Mic is off
Standby
Settings
Select a string, then play the reference tone to hear its target pitch.
Sources
- de Cheveigné, A., & Kawahara, H. (2002). YIN, a fundamental frequency estimator for speech and music. Journal of the Acoustical Society of America, 111(4), 1917–1930.
- Equal temperament with a selectable A4 reference. ISO 16 specifies 440 Hz as the standard concert pitch.
- Web Audio API and
getUserMedia, used only after you press Start tuner.
How it works
The tuner estimates the fundamental frequency of whatever is reaching the microphone, then maps that frequency to the nearest equal-tempered note at your A4 setting. The needle shows how many cents sharp or flat you are. Green means within ±5 cents.
In an instrument preset, the highlighted string is the one whose target pitch is closest to what you are playing. The reference tone plays that string’s target (or the detected note in chromatic mode) so you can match by ear.
FAQ
Does this send my microphone audio to a server?
No. Pitch is detected in your browser with the Web Audio API. Nothing is uploaded.
How accurate is it?
It uses the YIN pitch-detection algorithm and equal temperament relative to your A4 reference (440 Hz by default). On a clean tone it typically reads within a couple of cents. Room noise, cheap mics, and heavily distorted signals can throw it off.
Which tunings are included?
Standard EADGBE, Drop D, DADGAD, Open G, half-step down, 4-string bass (EADG), and ukulele (GCEA). Chromatic mode shows the nearest note for any pitch.
Use at your own risk. This is a practice reference, not a calibrated laboratory instrument. Verify critical intonation with a trusted tuner before a performance or a session. Microphone quality, room noise, and processed or polyphonic signals can reduce accuracy. Hearing levels from the reference tone are your responsibility — start quietly.
Need this on a real stage?
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