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ToolsOnline Guitar Tuner
Listens to your string through the microphone and shows the note and how many cents off it is. Runs right in your browser — no install, and no audio leaves your device.
Press “Start tuner” and allow the microphone.
Reference tones (standard tuning)
You can also tune by ear to these buttons. 6th string E2 (82.4 Hz) · 5th A2 (110 Hz) · 4th D3 (146.8 Hz) · 3rd G3 (196 Hz) · 2nd B3 (246.9 Hz) · 1st E4 (329.6 Hz).
FAQ
How do I use the online tuner?
Press “Start tuner”, allow the microphone and pluck one string. When the needle sits in the green middle zone you're in tune; left means flat (tighten the peg), right means sharp (loosen it).
It doesn't pick up any sound.
Check the microphone permission from the lock icon in the address bar, find a quiet spot and pluck one string at a time. A laptop's built-in mic is fine.
What are the notes of standard guitar tuning?
From the 6th string: E2, A2, D3, G3, B3, E4. You can also tune by ear with the reference tones below.
Is my audio sent to a server?
No. The sound is analyzed inside your browser only; nothing is stored or uploaded.