Start audio
Tap Play or press Space. Your browser requires a gesture before audio can play.
Guitar Tuner
Chromatic tuner with cents readout โ microphone activates when you start.
Microphone activates only when listening. Stop releases the mic immediately.
Note
โ
Frequency
โ
Cents
โ
โ
Standard tuning A4 = 440 Hz. Pluck a single string in a quiet room.
How browser tuning works
The microphone captures your instrument; autocorrelation estimates fundamental pitch and maps it to the nearest note in equal temperament. Cents show how sharp (+) or flat (โ) you are relative to that note.
Getting accurate reads
Play one string at a time, close to the mic but not clipping. Reduce background noise. Low E (~82 Hz) may be harder on laptop mics โ try harmonics or our 440 Hz reference tone.
Standard guitar strings
E2, A2, D3, G3, B3, E4 from low to high. When cents read near zero, you are in tune to A440 equal temperament.
How to use
Adjust settings
Use sliders and controls to set frequency, volume, and waveform. Changes apply in real time.
Export or share
Download a WAV file or copy a share link. All processing stays on your device.
Frequently asked questions
Do I need microphone access?
Yes, but only when you click Start Listening.