Online Instrument Tuner
Allow microphone access, play one string, and watch the reading settle on the note — with the cents value showing how far sharp or flat you are.
How the tuner reads your pitch
The tuner listens through your microphone, measures the fundamental frequency of the note you play, and maps it to the nearest pitch in equal temperament. The cents value tells you the rest: 0 is dead on, a positive number is sharp, a negative one is flat. Land inside ±5 cents and the string will sound in tune to most ears.
It reads any single-note source — guitar, bass, ukulele, violin, cello, wind instruments, even your voice. Play one note at a time; chords and ringing overtones confuse the pitch detector.
Standard tunings, string by string
Guitar in standard tuning is E2 A2 D3 G3 B3 E4 from the low string up. Bass is E1 A1 D2 G2. A high-G soprano or concert ukulele is G4 C4 E4 A4. Tune up to each note rather than down to it — arriving from below holds pitch better once you let go.
Transposing players can set an offset from the transposition menu — for example −2 for a B♭ trumpet — and the tuner will show concert pitch against your written part.
Frequently asked questions
Do I need to install anything?
No. The tuner runs in your browser and only asks for microphone access. Nothing is recorded or sent anywhere — the sound is analysed on your device.
Why does the note keep jumping around?
A weak signal, background noise, or more than one string ringing will make the reading jump. Move somewhere quieter, play a single string a little louder, and let it sustain.
What does A=440 Hz mean, and can I change it?
440 Hz is the standard reference pitch for the A above middle C. If your ensemble tunes to 442 or 438 instead, use the calibration field to shift the whole tuner to that reference.
