Open D Tuner Online
Tune your guitar by ear with your microphone, free.
Open D is a warm, resonant slide and fingerstyle tuning — strum the open strings and a rich D major chord blooms with deep low end. Tune to it below and let the open strings ring.
About Open D Tuning
Open D tuning is D A D F# A D (low to high). The open strings form a D major chord, so a single barre across any fret gives you a complete major chord — ideal for slide guitar and droning fingerstyle arrangements. Compared to Open G it sits lower and darker, with a fuller bottom end that many players find more resonant for solo acoustic work.
To reach Open D from standard EADGBE, change four strings: drop the low E down a whole step to D, drop the G (third) string down a half step to F#, drop the B (second) string down a whole step to A, and drop the high E down a whole step to D. Only the A and D strings keep their standard pitch. The two outer D strings two octaves apart give the tuning its powerful, ringing root.
Open D is closely related to Open E (the same intervals, a whole step higher) but with less string tension, so it is gentler on acoustic necks and a popular choice for fingerstyle blues.
Common Genres
- Slide and bottleneck blues
- Fingerstyle acoustic and folk
- Singer-songwriter and roots
- Open-tuned rock
Famous Songs
- Little Martha — The Allman Brothers Band
- Street Fighting Man — The Rolling Stones
- The Cave — Mumford & Sons
How to use this tuner
- Click Start Tuner and allow microphone access when prompted.
- Pluck each string in turn — the matching peg below lights up automatically.
- Tap any peg to hear its exact target pitch before you tune.
- Drop the low E, G, B and high E strings until each dial settles in the green band.
FROM TUNED TO PLAYING
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