Banjo Tuner Online

Open G: the 5-String’s Home Key

Open G — gDGBD, or G4 D3 G3 B3 D4 in scientific pitch — is the standard tuning of the 5-string banjo, so much the default that most tab, most instruction, and essentially all of bluegrass simply assume it. The name says why: strum every open string and you get a complete G major chord, ringing before a single finger touches the fretboard. That built-in chord is what makes rolls sound full and lets so much of the repertoire sit in open position. This tuner targets all five strings, referenced to A4 at 440 Hz, and walks each one to within five cents.

The fifth string is its own animal

The string listed first — the lowercase g — is the banjo’s signature oddity: a short drone string tuned to G4, the highest pitch on the instrument despite sitting where a low string would on anything else. It starts at the 5th fret, runs to a tuning peg mounted on the side of the neck, and rings under your thumb as the constant drone behind rolls and frailing alike. Because it never gets fretted in normal play, an out-of-tune fifth string colors literally everything you pick — tune it as carefully as the long four.

Pegs where you least expect them

Banjo tuners are laid out two per side of the peghead — plus that fifth peg on the neck — so the “which way do I turn this?” instinct carried over from guitar will steer you wrong on half the pegs. That’s exactly what the worded tune-up / tune-down hint is for: it tells you the direction the pitch needs to move, you turn gently and watch the needle respond, and if it moves the wrong way you simply reverse. Pick one string at a time and let it ring — the banjo’s bright attack decays quickly, so fresh picks give the steadiest readings.

Two G’s, two D’s — help the auto-detect

Open G repeats notes across octaves: G4 and G3, D4 and D3. When a string is close to pitch the detector separates them cleanly, but a badly slipped string can register as its octave twin for a moment. If the display names the wrong one, tap the peg you’re actually working on to lock it. And if you’re headed somewhere else entirely — double C for old-time fiddle tunes, open D for that lonesome sound — those presets aren’t here yet, but every peg’s reference tone plays aloud, so you can retune by ear from the G and D anchors.

The rest of the jam circle

Whatever else gets passed around the circle, there’s a tuner for it: guitar, mandolin, fiddle, bass, and ukulele all run on the same engine with their own string sets. The pitch detector shows the exact frequency of anything you play — useful for those by-ear retunes — and the online audio editor handles the recording after.