Free Online Guitar Tuner & Chromatic Tuner

How to Tune a Guitar Online

1. Click "Start tuning" and allow microphone access.
2. Play one guitar string at a time and let it ring clearly.
3. Watch the note and cents indicator to see whether the string is sharp or flat.
4. Adjust the tuning peg until the note is centered and the tuner shows it's in tune.

Free Online Guitar Tuner

Tune your acoustic or electric guitar online using your device's microphone. Play one string at a time and watch the pitch indicator show whether the note is sharp, flat, or in tune.

Standard Guitar Tuning

Standard guitar tuning from the lowest string to the highest is E2, A2, D3, G3, B3, and E4. Use the chromatic tuner to check each string and adjust until the pitch is centered.

Free Chromatic Tuner

This is a chromatic tuner, so it can detect all twelve notes of the musical scale rather than being limited to one instrument or tuning. Use it for guitar, bass, ukulele, violin, cello, brass, woodwinds, vocals, and other instruments that produce a clear pitch.

The tuner shows the detected note, frequency, and cents difference from the nearest note. A centered reading means the instrument is in tune, while a negative or positive reading indicates the pitch is flat or sharp.

Guitar Tunings You Can Use

Because this is a chromatic tuner, you can use it for standard and alternate guitar tunings. Play each string and tune it to the target note for the tuning you want.

How the pitch detection works

This tuner analyzes the actual shape of your instrument's sound wave to find its true fundamental frequency, rather than just checking which frequency band is loudest. That distinction matters for accuracy: a simpler approach can easily confuse two notes that are close together, while analyzing the waveform's repeating pattern directly gives a much finer, more reliable reading of exactly what pitch is being played.

Want the fuller breakdown of how autocorrelation-based pitch detection actually works, and why the tuner turns off your browser's echo cancellation and noise suppression? Read How Instrument Tuners Actually Detect Pitch.

Common uses

Tuning a guitar, bass, ukulele, or violin before practicing or recording, checking vocal pitch accuracy during warm-ups, and verifying an instrument's intonation across its range.

Need to find the pitch of an existing recording instead? Try the Key & BPM Finder. Once your instrument is tuned, use the Online Metronome to practice at a consistent tempo.

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Frequently asked questions