A violin and a ukulele do not share a single tuning, but one good online tuner can handle both. The trick is knowing the target notes for your instrument and which way to turn each peg. This guide gives you both, plus microphone tips and a by-ear fallback, so you can tune either instrument in a few minutes with no app and no download.
Tune any string instrument in 5 steps
- Pick your instrument in the tuner first. Violin strings from lowest to highest are G, D, A, E. Standard ukulele strings are G, C, E, A, with the G string tuned higher than the C, which is called re-entrant tuning.
- Allow microphone access when the browser asks, and sit in a quiet room. Background noise is the most common reason a tuner misreads a note.
- Play one string at a time and let it ring. The tuner shows the nearest note and whether you are flat (too low) or sharp (too high).
- Turn the peg slowly toward the target. On violin, use the fine tuners for small adjustments and the pegs only for large ones. On ukulele, small turns make a big difference, so move gently.
- Recheck all strings after the first pass. Tightening one string changes the tension on the others, especially on violin, so a second pass is normal.
What flat, sharp, and cents mean
A tuner reports how far you are from the target note in cents, where 100 cents make one semitone, the step between two neighbouring piano keys. Within about 5 cents of the target reads as in tune, which is tighter than most ears can judge on a single note. Flat means the string is too low, so tighten it. Sharp means it is too high, so loosen it. Always tune up to a note rather than down to it when you can: tightening to the target holds tension better and keeps the string stable. If the tuner jumps between notes, mute the other strings with your free hand and pluck more firmly near the middle of the string.
Tuning by ear when technology fails
Microphones fail at the worst moments: a dead battery, a denied permission, or a noisy room. Tuning by ear is the fallback every musician should know. Start from one reliable reference note, such as a piano, a tuning fork, or another tuned instrument. On violin, tune the A string first, then tune the other strings in fifths against it: play two strings together and adjust until the beating, the wavering sound of two close pitches, disappears. On ukulele, tune the C string from your reference, then tune the E string against it, and so on, checking octaves as you go. The method is slower than a tuner and less precise at first, but it trains your ear, and a trained ear is what lets you notice when you drift out of tune mid-song, which no tuner can do for you.
Try it faster with the free tool
Everything above works without any tool, but the free Instrument Tuner — Tune Guitar, Violin & Ukulele Online, Free does it in seconds. Try it right here:
Tips and common mistakes
- Tune before every practice session. Strings stretch, rooms change temperature, and yesterday’s tuning is rarely today’s.
- New strings need several tunings before they settle. Tune, play for a few minutes, and tune again.
- If the mic will not work, use reference tones. Tap a string button in the tuner to hear the target pitch, then match it by ear.
- Never force a stiff violin peg. If it will not turn, stop and ask a teacher or luthier rather than risking a broken peg or string.
Pick the instrument, play one string, turn slowly, recheck everything. Those four moves tune a violin, a ukulele, or a guitar, with one free tool and no app.