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Try Guitar Tricks free for 14 daysAcoustic Guitar Tuner Online
Tune your acoustic guitar online with a free microphone tuner. Use Standard EADGBE tuning, Drop D, DADGAD, open tunings, and other acoustic-friendly setups without installing an app.
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Free Online Acoustic Guitar Tuner
Use the microphone tuner for everyday acoustic guitar tuning, quick phone checks, and alternate acoustic setups. Start with Standard EADGBE, then switch tunings when a song calls for it.
Standard notes
E-A-D-G-B-E
The most common acoustic guitar tuning from the 6th string to the 1st string.
Best signal
Sound hole
Place your phone or computer mic close to the guitar and pluck one string at a time.
Common styles
Folk, rock, worship
Use Standard, Drop D, DADGAD, Open G, and Open D for common acoustic songs.
Acoustic Tuning Tips
Acoustic guitars are louder than electrics, but the extra resonance can make pitch detection jump around. These quick habits help the tuner lock onto the fundamental note.
Let each string ring
Acoustic guitars produce strong overtones. Pluck near the sound hole, mute the other strings, and wait for the tuner to settle before turning the peg.
Tune up to pitch
If a string is sharp, loosen below the note first, then tighten back up. Tuning upward helps the string hold tension more reliably.
Recheck after strumming
After all six strings are green, play a few open chords and recheck. Acoustic strings often settle after the first pass.
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Common Acoustic Guitar Tunings
Start with standard tuning, then try these acoustic-friendly tunings when a song calls for a different feel.
Standard Tuning
E-A-D-G-B-E for most acoustic songs, chord charts, and beginner lessons.
Drop D Tuning
Lower only the low E string to D for fuller bass notes and easy D power chords.
DADGAD Tuning
A suspended acoustic tuning for Celtic, folk, fingerstyle, and ringing drones.
Open G Tuning
A favorite acoustic and slide tuning with big open G major resonance.
How to Tune an Acoustic Guitar Online
- 1Choose Standard tuning unless your song uses an alternate tuning.
- 2Allow microphone access in your browser.
- 3Pluck one string clearly and let it ring without touching nearby strings.
- 4Tighten the tuning peg if the note is flat, or loosen it if the note is sharp.
- 5Repeat for all six strings, then recheck the low E and B strings after a minute.
More Help for Acoustic Players
Acoustic Guitar Tuner FAQ
- Is this acoustic guitar tuner online free?
- Yes. This acoustic guitar tuner is free to use online in your browser. Allow microphone access, choose a tuning, and tune your acoustic guitar without installing an app.
- What is standard tuning for acoustic guitar?
- Standard acoustic guitar tuning is E2-A2-D3-G3-B3-E4 from the lowest string to the highest string. It is the same note layout used by most electric guitars.
- Does this acoustic guitar tuner work on a phone?
- Yes. Open the page on iPhone, Android, tablet, or desktop, allow microphone access, then pluck one acoustic guitar string at a time.
- Why does my acoustic guitar drift out of tune?
- New strings, temperature changes, humidity, heavy strumming, and strings binding in the nut can all make an acoustic guitar drift sharp or flat. Stretch new strings gently and recheck tuning after a few minutes of playing.
- Can I use this tuner for alternate acoustic tunings?
- Yes. Use the tuning selector for Standard, Drop D, DADGAD, Open G, Open D, Half Step Down, D Standard, and other acoustic-friendly alternate tunings.
- Should I tune an acoustic guitar by ear or with a tuner?
- A tuner is the fastest way to get accurate pitch, especially when strings are old or the room is noisy. Ear training is still useful, but a microphone tuner gives you a reliable reference.