1. Allow microphone access
Press "Enable microphone" and allow access when your browser asks. Without it, the tuner cannot hear your guitar.
Browser guitar tuner
Guitar Tuner
Tune your guitar with your microphone. Real-time pitch detection in your browser — no install, no signup.
Local processingYour input never leaves your device.
Target A2 110.00 Hz
Heard – –
–
Press "Enable microphone" to start tuning.
String
What it does
A guitar tuner listens to your instrument through your microphone and tells you whether each string is sharp, flat, or in tune. This one runs entirely in your browser using the Web Audio API: pick a string in standard tuning (E2 A2 D3 G3 B3 E4) or let auto mode find the nearest string, then play — the meter shows your pitch in real time with cents deviation. Nothing is recorded or uploaded: audio is analyzed on your device and discarded.
How to use
2. Pick a string or use auto mode
Choose a string (E2–E4), or leave auto mode on to detect the nearest string automatically.
3. Play and tune
Pluck the string. The needle shows cents: left is flat, right is sharp, green is in tune (within ±5 cents). Tune until the needle centers.
Limitations
Accuracy depends on your microphone and room noise — tune in a quiet room. Very low notes below E2 and very quiet plucks may not register. Microphone access requires HTTPS and your permission. This tuner is for everyday tuning, not for setting intonation or professional luthier work.
FAQ
Do I need an account?
No. It runs right in your browser — no install, no signup. Microphone permission is the only thing it asks for.
Is my audio uploaded anywhere?
No. Pitch detection happens on your device with the Web Audio API. Audio is analyzed in memory and never recorded, stored, or sent anywhere.
What does "cents" mean?
Cents measure how far you are from the target pitch: 100 cents is one semitone. The meter shows −50 to +50 cents; green within ±5 cents means in tune.
Why does it not hear my guitar?
Check three things: microphone permission is allowed (click the lock icon in the address bar), you are in a quiet room, and you are plucking firmly near the sound hole or pickup.
Which tuning does it use?
Standard tuning: E2 (82.41 Hz), A2 (110.00 Hz), D3 (146.83 Hz), G3 (196.00 Hz), B3 (246.94 Hz), E4 (329.63 Hz).