How accurate is the tuner?

The autocorrelation-based detection resolves frequency within 0.1 Hz and cents within 1 cent at typical guitar frequencies. For best results, pluck the string cleanly (avoid muting or harmonics) and let the note ring.

Why use autocorrelation instead of FFT?

Autocorrelation directly measures the fundamental period in the time domain, which is more robust than FFT for instruments with strong harmonic content. It avoids the 'octave error' problem common with FFT-based tuners.

Can I use it for alternate tunings (drop D, open G, DADGAD)?

Yes — the tuner detects the nearest chromatic note regardless of tuning. Simply adjust each string to your desired note using the display. The string labels show standard EADGBE for reference.

Is my audio sent anywhere?

No. All pitch detection happens locally in your browser using the Web Audio API. No audio data leaves your device.

Guitar Tuner

Tune your guitar using your device microphone. Autocorrelation pitch detection identifies the note and shows how many cents sharp or flat you are. Standard E A D G B E tuning.

Note

Frequency

Cents

Tuning Gauge

−50¢ 0¢ +50¢

Standard Tuning (E A D G B E)

E2
82.41 Hz

A2
110 Hz

D3
146.83 Hz

G3
196 Hz

B3
246.94 Hz

E4
329.63 Hz

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How to use Guitar Tuner

Click Start Tuner and allow microphone access when prompted.
Pluck a single string and hold the note steady.
Watch the display — the note name, frequency, and cents deviation tell you which peg to turn and in which direction.

What is Guitar Tuner?

This guitar tuner uses your device's microphone and autocorrelation pitch detection to identify the fundamental frequency of each plucked string. It maps the detected pitch to the nearest chromatic note and shows the cents deviation, so you know exactly how much to adjust each tuning peg.

Autocorrelation works by comparing a signal with a delayed copy of itself — when the delay matches the fundamental period, the correlation spikes. This produces much more reliable pitch detection than simple zero-crossing or FFT bin-picking, especially for instruments with strong harmonics like guitar.

All processing runs entirely in your browser. No audio data is ever uploaded to a server.

FAQ

How accurate is the tuner?: The autocorrelation-based detection resolves frequency within 0.1 Hz and cents within 1 cent at typical guitar frequencies. For best results, pluck the string cleanly (avoid muting or harmonics) and let the note ring.
Why use autocorrelation instead of FFT?: Autocorrelation directly measures the fundamental period in the time domain, which is more robust than FFT for instruments with strong harmonic content. It avoids the 'octave error' problem common with FFT-based tuners.
Can I use it for alternate tunings (drop D, open G, DADGAD)?: Yes — the tuner detects the nearest chromatic note regardless of tuning. Simply adjust each string to your desired note using the display. The string labels show standard EADGBE for reference.
Is my audio sent anywhere?: No. All pitch detection happens locally in your browser using the Web Audio API. No audio data leaves your device.

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Author

Aisha Rahmani"The Visual Storyteller"

Design Technologist & Media Specialist

Aisha bridges the gap between pixels and code. With expertise in image processing, SVG optimization, and video compression.

📖 Guitar Tuner on Wikipedia · Audio Tools on Wikipedia · Guitar Tuner on Britannica

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