Free Online Guitar Tuner
Tune your guitar by ear with your microphone, free.
A chromatic guitar tuner that runs in your browser — no install, no upload. Pluck a string and watch the cents dial.
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-50¢0+50¢
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Reference
Standard Tuning
Tune your guitar using your microphone.
Alt-tunings
Drop DD2 A2 D3 G3 B3 E4Drop the low E to D for heavy power-chord riffs and a deeper low end.DADGADD2 A2 D3 G3 A3 D4The Celtic open-Dsus4 tuning — droning, modal, and great for fingerstyle.Open GD2 G2 D3 G3 B3 D4Strum a G major chord open — the classic slide-blues and Stones rhythm sound.Open DD2 A2 D3 F#3 A3 D4Ring out a D major chord open — a warm, resonant base for slide and fingerstyle.Half-Step DownD#2 G#2 C#3 F#3 A#3 D#4Every string a semitone lower (Eb standard) for a fatter tone and easier bends.Double Drop DD2 A2 D3 G3 B3 D4Both outer strings dropped to D for droning open chords and folk-rock textures.Open EE2 B2 E3 G#3 B3 E4An E major chord open — bright and punchy, a staple of electric slide blues.Drop CC2 G2 C3 F3 A3 D4Down a whole step with a dropped low C — heavy, chunky riffing for metal.Drop BB1 F#2 B2 E3 G#3 C#4Ultra-low tuning for djent and modern metal — crushing, tight low-end power chords.Open CC2 G2 C3 G3 C4 E4A lush, wide-voiced C major chord open — rich for ambient and fingerstyle playing.
How to use
- Click Start Tuner and allow microphone access when prompted.
- Pluck one open string at a time, letting it ring out cleanly.
- The big letter shows the nearest pitch; the dial shows how many cents you are sharp (+) or flat (−).
- Aim for the indicator inside the green band (±5 cents).
- Need a non-standard pitch? Pick 432, 440, 441, or 443 Hz from the Reference row.
Tips
- Tune away from loud sources — air conditioners, background music, and other instruments add competing fundamentals that confuse pitch detection.
- New strings drift. Re-tune after the first few minutes of play, and again whenever the room temperature changes.
- Standard tuning is E A D G B E (low to high). The pegs at the bottom highlight the string you are aiming at.
Privacy
Audio is processed locally in your browser using the Web Audio API and the pitchy library. Nothing is uploaded.
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