Acordario

Guitar chord diagrams and voicings

Online guitar tuner

Tune your guitar with your device's microphone, with nothing to install. Play an open string and follow the needle.

Sound is processed on your device; it is not recorded or sent anywhere.

Press “Start tuning” and allow the microphone.

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Mode

Automatic: picks the string closest to what you play.

Strings

How to use the tuner

  1. Press “Start tuning” and allow the microphone. The browser only asks the first time.
  2. Play an open string on its own and let it ring. In automatic mode the tuner recognises the closest string; in manual mode you tune the one you pick from the list of strings.
  3. If the needle is on the left, the note is lower: raise the pitch by tightening the tuning peg. If it is on the right, the note is higher: lower it by loosening the peg. With the needle in the green zone (±5 cents) the string is in tune and gets a mark.
  4. It is best to reach the note from below: if you overshoot, loosen a little more and tighten again. Find a quiet spot and play at a medium volume. To hear the note a string should sound, press its listen button.

The tunings

The tuning is the note of each open string, from string 6 (the lowest) to string 1.

Standard: E A D G B E
The most common: E A D G B E. It is the tuning almost every chord and scale on this site assumes.
Drop D: D A D G B E
String 6 drops from E to D (D A D G B E). Power chords can be played with one finger and the sound is heavier; common in rock, metal and folk.
Half step down: Eb Ab Db Gb Bb Eb
Every string drops a semitone (Eb Ab Db Gb Bb Eb). The strings feel looser and singers reach lower notes; used by many rock and blues bands.
Whole step down: D G C F A D
Every string drops a whole step (D G C F A D): lower, and more comfortable for singing in low keys.
Drop C: C G C F A D
A whole step down and, on top of that, string 6 drops another whole step (C G C F A D): very low, for heavy music.
Open G: D G D G B D
D G D G B D: the open strings sound a G major chord. A classic of blues and slide guitar.
Open D: D A D F# A D
D A D F# A D: the open strings form a D major chord. Common in blues, folk and slide.
DADGAD: D A D G A D
D A D G A D: neither major nor minor, so it sounds open and mysterious. Typical of Celtic folk and fingerstyle.

Why A4 = 440 Hz?

It is the international reference (ISO 16): the A above middle C vibrates 440 times per second, and all the other notes are calculated from it so that every instrument sounds in tune with the rest. Some orchestras use 442 Hz and some people tune to 432 Hz, so you can change the reference between 430 and 450 Hz. If you are going to play with other instruments (a piano, say), use the same reference as they do.