Drop D
D A D G B E
Lower the 6th string one tone. Used in metal and rock: Metallica, Foo Fighters, Tool.
Free Online Tool
Guitar Tuner
Tune by ear or use your microphone for automatic chromatic tuning. Works on any guitar, bass, or stringed instrument. No app required.
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–50¢ 0 +50¢
· Tap to start
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Standard Guitar Tuning (EADGBE)
6 E Lowest string
5 A
4 D
3 G
2 B
1 E Highest string
Common Alternate Tunings
Open G
D G D G B D
Beloved by blues and slide guitar. Keith Richards' go-to tuning for Rolling Stones riffs.
Open E
E B E G# B E
Classic slide and blues tuning. Duane Allman used it on Layla and countless blues standards.
DADGAD
D A D G A D
Modal tuning popular in Celtic folk and acoustic fingerpicking. Rich, open drone sound.
Half Step Down (Eb)
Eb Ab Db Gb Bb Eb
Every string down one semitone. Hendrix, SRV, and Slash used this for a looser, darker feel.
Full Step Down (D)
D G C F A D
Two semitones down from standard. Common in grunge and modern metal for heavier riff tone.
How to Use the Online Guitar Tuner
Select your target tuning (E Standard, Drop D, Eb, and more), then click Start Tuner and allow microphone access. Play one string at a time: the tuner finds the closest string in your chosen tuning and shows how many cents sharp or flat you are. Within ±5 cents is considered well in tune.
For electric guitar, plug into your amp at low volume or play near the microphone. For best results, play in a quiet room and let each note ring cleanly before adjusting the tuning peg. The tuner works on electric guitar, acoustic guitar, bass, and ukulele.
What Do Cents Mean?
A cent is 1/100th of a semitone. When the needle is at 0, the note is perfectly in tune. Negative cents means the string is flat (too low): tighten the peg. Positive cents means the string is sharp (too high): loosen the peg. Human ears can generally detect differences of around 5 to 10 cents, so aim for within ±5 cents for clean intonation.
Tune Your Guitar on GuitarZone
Once your guitar is in tune, open any guitar tab, guitar lesson, or cover video on GuitarZone. Every song page includes a built-in Practice Toolbar with A/B loop and 0.5× speed control, so you can tune up and start practicing the exact riff you're working on, all in one place.