Guitar Tuner
Free online guitar tuner: allow your microphone and tune standard, drop D, open G, DADGAD and about 20 other tunings, for 6, 7 and 8-string guitars. Works on phone and desktop, no sign-up.
About this guitar tuner
This is a free online guitar tuner that listens through your microphone, so there’s no cable, clip or app to install. It works with acoustic, electric and classical guitars, tells you which string you’re closest to, and shows whether it’s flat or sharp as you turn the tuning peg.
Standard guitar tuning
From the thickest (lowest) string to the thinnest, a guitar in standard tuning is E, A, D, G, B, E. The tuner also knows these:
| Tuning | Strings |
|---|---|
| Guitar · Standard | E A D G B E |
| Guitar · Half step down | D♯ G♯ C♯ F♯ A♯ D♯ |
| Guitar · Whole step down | D G C F A D |
| Guitar · Step and a half down | C♯ F♯ B E G♯ C♯ |
| Guitar · Two steps down | C F A♯ D♯ G C |
| Guitar · Drop D | D A D G B E |
| Guitar · Drop C♯ | C♯ G♯ C♯ F♯ A♯ D♯ |
| Guitar · Drop C | C G C F A D |
| Guitar · Drop B | B F♯ B E G♯ C♯ |
| Guitar · Drop A | A E A D F♯ B |
| Guitar · Double drop D | D A D G B D |
| Guitar · Open G | D G D G B D |
| Guitar · Open D | D A D F♯ A D |
| Guitar · Open D minor | D A D F A D |
| Guitar · Open E | E B E G♯ B E |
| Guitar · Open A | E A E A C♯ E |
| Guitar · Open C | C G C G C E |
| Guitar · DADGAD | D A D G A D |
| Guitar · All fourths | E A D G C F |
| Guitar · New Standard (Fripp) | C G D A E G |
| Guitar · Nashville (high-strung) | E A D G B E |
| Guitar (7-string) · Standard | B E A D G B E |
| Guitar (7-string) · Drop A | A E A D G B E |
| Guitar (7-string) · Half step down | A♯ D♯ G♯ C♯ F♯ A♯ D♯ |
| Guitar (7-string) · Drop G | G D G C F A D |
| Guitar (8-string) · Standard | F♯ B E A D G B E |
| Guitar (8-string) · Drop E | E B E A D G B E |
How to tune your guitar
- Press “Start tuner” and allow microphone access.
- Pluck the low E string and let it ring. The note and a needle show how far off it is.
- Needle left of center means the string is flat: tighten the peg. Right of center means sharp: loosen it.
- When the string turns green it’s in tune. Move to A, then D, G, B and the high E.
- Check all six strings once more, since tightening one slightly changes the others.
Tips
- Tune up to the note. If you overshoot, go a little below it and come back up, which helps the string hold its pitch.
- New strings stretch and go flat for the first day or two. Re-tune a few times and they will settle.
- On an electric, let only the string you’re tuning ring out, and keep amp hum and other instruments away from the microphone.
- Tuning to the guitar’s own sound is best: hold the phone or laptop close to the soundhole or amp.
FAQ
Does it work with an electric guitar?
Yes. It hears whatever the microphone hears, so an electric guitar works through its amp, or unplugged if it’s loud enough in a quiet room.
How do I tune to drop D, open G or DADGAD?
Pick it from the tuning menu above the tuner and it will target those notes instead. “Custom…” lets you enter any notes you like, up to eight strings.
How do I tune a 7-string guitar?
Open Settings above the tuner and set the number of strings to 7, then pick its tuning. For anything unlisted, “Custom…” takes any notes you enter (B1, E2, A2, D3, G3, B3, E4, lowest to highest, for standard).
The tuner keeps jumping to a different string.
Switch from auto-detect to manual and tap the string you’re tuning. The tuner then measures against that string only.
Is it accurate?
It measures pitch to within a cent or two under good conditions, which is more than enough for playing. A quiet room and a close microphone make the biggest difference.
Looking for something else? Try the bass tuner, the ukulele tuner, or the full chromatic tuner.