Guitar tuner

Tune with your microphone or by ear with reference tones.

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Allow microphone access, then play one string at a time.

Tuning

Reference tones

Click a string to hear its target note, then match it by ear.

Press “Start tuner” and allow microphone access. Nothing is recorded or uploaded — everything happens in your browser.
Play one open string at a time and let it ring. The big letter shows the closest string; the needle shows how far off you are.
Needle on the left = too low (flat): tighten the string. Needle on the right = too high (sharp): loosen it. Aim for the green center.
Always tune up to the note: if you are sharp, go below the note first and then come back up. Strings hold their tuning better that way.