How to tune your instrument
- Choose your instrument preset — Guitar, Bass, Ukulele, Violin or Chromatic.
- Press “Start tuner” and allow microphone access when your browser asks.
- Play one string or note; read the detected note, the Hz and how many cents you are off.
- Turn the peg until the needle centres and turns green within five cents, then move to the next string.
This online guitar tuner listens through your microphone and detects pitch in real time, so you can tune a guitar, bass, ukulele or violin without downloading an app. The big note readout and swinging cents meter make it obvious whether you are sharp or flat, while instrument presets light up the closest string in standard tuning. Musicians use it to tune before practice, to check intonation up the neck, to match an ensemble at 442 Hz, or to drop to 432 Hz for alternative tuning. Because the audio is analysed locally in your browser, it is private, instant and free — handy on stage, in the studio or on a phone during a rehearsal break.
FAQ
How do I tune my guitar with this online tuner?
Pick the Guitar preset, press Start tuner and allow microphone access, then pluck one string at a time. The tuner shows the detected note, the cents you are off and a needle that turns green when you are within five cents — turn the peg until each of the EADGBE strings locks in.
Does the tuner work for bass, ukulele and violin too?
Yes. Switch presets to Bass (EADG), Ukulele (GCEA) or Violin (GDAE) and the tool highlights which string you are closest to. Chromatic mode tunes any instrument to the nearest semitone, so it also covers mandolin, cello and orchestral tuning.
Can I change the reference pitch from 440 Hz?
Yes. The A4 reference slider goes from 415 Hz to 445 Hz, with 440 Hz as the default. Drop it to 432 Hz for alternative tuning, or match an ensemble that tunes to 441 or 442 Hz — every target frequency recalculates instantly.
Is this guitar tuner free and does it upload my audio?
It is completely free with no signup, and nothing is uploaded. The microphone signal is analysed live in your browser with the Web Audio API and never leaves your device, so it works on a phone, tablet or laptop the moment you allow mic access.