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Guitar Tuner

Tune your guitar with precision

Grant microphone access to start tuning

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-- Hz
-500+50
In Tune

Tap a string to hear reference tone

Tuning Tool

What is a guitar tuner?

A guitar tuner listens to the sound of your strings and tells you whether each note is sharp, flat, or perfectly in tune. Our free online guitar tuner uses your device's microphone and real-time pitch detection to give you precise, instant feedback.

No app downloads, no cables, no clip-on hardware required. Just open your browser, grant microphone access, and start tuning. Works on acoustic guitar, electric guitar, bass, ukulele, or any pitched instrument.

How To

How to tune your guitar

1

Enable your microphone

Click the microphone button and allow browser access. The tuner needs audio input to detect pitch.

2

Play a string

Pluck one string at a time. The tuner will display the detected note, how many cents sharp or flat you are, and which string is closest.

3

Adjust until centered

Turn your tuning peg until the cents indicator is centered and the display glows green. Repeat for each string.

Features

Why use our guitar tuner

Real-time pitch detection

Uses autocorrelation-based pitch detection for accurate fundamental frequency analysis, even in noisy environments.

Multiple tunings

Standard, Drop D, Open G, Open D, DADGAD, and Half Step Down tunings built in. Select your tuning and the string references update instantly.

Cents precision

Visual cents gauge shows exactly how far sharp or flat you are with a smooth, responsive indicator bar.

Reference tones

Tap any string button to hear a synthesized reference tone, perfect for tuning by ear or verifying your pitch in loud settings.

Frequently asked questions

The tuner uses a YIN-inspired autocorrelation algorithm with parabolic interpolation for sub-sample accuracy. It can detect pitch within a few cents in a reasonably quiet environment.

Yes. Any modern browser with microphone support (Chrome, Safari, Firefox, Edge) on both desktop and mobile devices will work. Simply grant microphone permission when prompted.

Absolutely. The tuner is chromatic, meaning it detects any pitch. While the string reference buttons are tailored to guitar tunings, the note display and cents indicator work for any instrument.

Make sure you have granted microphone permission in your browser, your microphone is not muted, and there is minimal background noise. Pluck one string at a time for the cleanest detection.