Online Guitar Tuner
Turn on your mic and play any string — this tool will detect it and tell you if the string is in tune. Free, no download.
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0.0 Hz (target: — Hz)
Play a string…
Needle in the middle (green) = perfect tune. Left = too low (tighten), right = too high (loosen).
How to use
- Press Start Mic and allow mic access in the browser (works over HTTPS).
- Play any guitar string — the needle shows if the string is too high or too low.
- When the needle is in the middle on green, the string is perfectly tuned. Works better in a quiet place.