Guitar Tuner

Tune your guitar online

Your microphone audio is analyzed live in your browser using the Web Audio API and is never recorded, saved, or sent anywhere — the same on-device-only approach the Watar app itself uses. Requires a secure (https) connection; works in current Chrome, Safari, Firefox, and Edge.

Standard Guitar tuning

● Tune from the low E string up — a slack string can pull neighboring strings slightly out as you go.

● Pluck one string at a time and let it ring for a full second before reading the display.

● New strings stretch; retune a couple of times after installing a fresh set.

Frequently asked questions

What is standard guitar tuning?

Standard tuning, low to high, is E2 A2 D3 G3 B3 E4 (often remembered as "Eddie Ate Dynamite, Good Bye Eddie"). This applies to both acoustic and electric 6-string guitars.

Can I tune a 7-string or drop-D guitar here?

Yes — the Watar app's guitar mode includes drop D, drop C, open tunings, and a 7-string option. The browser tuner above tracks standard tuning; for altered tunings, install the app or use the custom tuner.

Does this work for electric guitar without an amp?

Yes, as long as your device's microphone can pick up the acoustic sound of the strings (plucked unplugged) it will detect pitch, though a direct pickup/amp signal through the native app is more reliable for electrics.

Get the full Watar app

The browser tuner above is free and always will be — no install needed. For practice mode, drone/reference tones, auto string detection, a metronome, and offline use, install the Watar app.

Tune another instrument

Playing something else? Watar's app supports 11 instruments and 30+ tuning styles, including a fully custom slot for anything not listed. Set up a custom tuning →