Free Online Guitar Tuner
Press Start, allow the microphone and play one string at a time.
MixMasterAI · Guitar Tuner
In tuneHeard
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String
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Offset
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The sound is analysed on your device. Nothing is recorded or uploaded.
How to tune
- 1
Pick a tuning
Standard, drop D or half-step down. The six target notes show under the buttons.
- 2
Play one string
Pluck it firmly and let it ring. The tuner picks the closest string in the tuning.
- 3
Follow the needle
Left of centre is flat, so tighten. Right is sharp, so loosen. Stop when the lime lamp is on.
The three tunings
Standard
E A D G B E
The default for almost all guitar music and lessons.
Drop D
D A D G B E
Low string down a whole step. Power chords with one finger, used a lot in rock and metal.
Half-step down
Eb Ab Db Gb Bb Eb
Every string a semitone lower. Easier bends and a darker sound.
Tips for a stable tune
Tune up to the note
If a string is sharp, go below the note first and then bring it up. The string holds pitch better that way.
Retune after a change
Changing one string's tension pulls the neck slightly, so check all six again once you finish.
New strings stretch
Fresh strings go flat for the first day or two. Gently pull each one away from the fretboard and retune.
Questions.
Is my microphone audio recorded?
No. The tuner reads the microphone signal on your device to measure the pitch, then throws it away. Nothing is saved or sent anywhere.
Why does the needle jump around?
Pick one string at a time and let it ring. Mute the other strings with your hand, and move away from fans or other noise. Harmonics from a hard pick can confuse any tuner for a moment.
What does cents mean?
A cent is one hundredth of a semitone. Within 5 cents of the target the lamp turns on, which is closer than most people can hear.
Can I tune a bass or ukulele?
The note readout works for any instrument between about 60 Hz and 1000 Hz, but the string list follows guitar tunings. The low E of a bass is below that range.
Does it work offline?
Yes. After the page loads, all pitch detection runs in your browser with no connection needed.