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Free Online Guitar Tuner

Tune your guitar with your device's microphone - no app, no download, no account. Your audio is analyzed locally in your browser and never sent anywhere. Click start, allow microphone access, and play one string at a time.

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Play a string

Microphone is off. Tuning works best in a quiet room.

How to use it

  1. Pick your tuning (standard E A D G B E is the default).
  2. Press start and allow microphone access when the browser asks.
  3. Pluck one string and let it ring. The display names the nearest note in your chosen tuning.
  4. Turn the tuning machine slowly: if the needle sits left (flat), tighten the string; right (sharp), loosen it. Green center means in tune (within about 5 cents).
  5. Repeat for each string, thickest to thinnest, then do one more pass - tightening earlier strings pulls the others slightly out.
Too much background noise? Electric guitar: plug in if you can, or turn your amp's volume up and hold the guitar near the mic. Acoustic: point the sound hole toward your device.

New to tuning?

Lesson 2: how to tune a guitar walks through it slowly, including how to tune by ear when no tuner is around.