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Instrument Tuner
Play accurate reference tones for guitar, bass, ukulele and violin with a needle gauge.
Play reference tones for your instrument
0 cents
Playing: Nothing
Frequency: 82.41 Hz
Position in tuning: String 1 of 6
Status: Ready
How to use the Instrument Tuner
- Pick the tuning that matches your instrument, such as guitar or violin.
- Choose the reference note you want and press Play tone to hear it.
- Adjust the fine tune slider to move the note up or down in cents.
Features
- Guitar, bass, ukulele and violin tunings
- Every semitone from E1 to E5
- Fine tuning in cents with a needle gauge
- Concert pitch with A4 at 440 Hz
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Frequently Asked Questions
Common questions about the free online instrument tuner.
Choose the guitar tuning, pick the string you want, press Play tone and adjust the string
until it matches the tone you hear.
Standard guitar E A D G B E, four string bass E A D G, ukulele G C E A and violin G D A E,
each with every string note ready to play.
Concert pitch means A4 sounds at 440 Hz, and every other note is built from that using the
twelfth root of two as the semitone ratio.
It shifts the reference tone by up to 50 cents either way, so you can match an instrument
that is tuned slightly off standard pitch.
The needle points to the current offset in cents between the exact note and the tone being
played, with the note name shown in the middle.
Yes. Pick bass or ukulele from the tuning menu and the note list and the counter follow that
instrument automatically.
Always tune up to the note where you can. Tuning down can leave slack in the string, so if
you overshoot, go below and come back up.
No. This tool plays reference tones for you to match by ear. Nothing is recorded and
microphone permission is never requested.
Last updated: October 10, 2026