Practice tool

Guitar tuner

Standard tuning, low to high: E A D G B E. Play one open string at a time and watch the needle. Each string ticks off when it holds in tune. The tuner names whatever note it hears, so other tunings (drop D, a half step down) work too.

A4 440 Hz

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Play a string

Play any open string.

0 of 6 strings in tune

Tune up with your microphone

The tuner listens to your guitar through your device’s microphone. The sound is analyzed right here in your browser; nothing is recorded or sent anywhere.

Your browser will ask for permission the first time.

Reference tones

Hear each string’s note and tune to it by ear. They follow the A4 setting.

Tips

Pluck one string firmly and let it ring. The tuner reads the steady part of the note, just after the pick attack.
Flat means the note is too low: tighten the string. Sharp means too high: loosen it. Small turns go a long way.
If a string is a long way off, it reads as whatever note it’s at. Switch to One string and tap its peg, and the needle shows how far it is from that string’s note.
Leave A4 at 440 Hz unless you’re playing along with a recording or an instrument tuned a little differently.
Prefer to tune by ear? Play a reference tone and turn the peg until the two sound like one note.