Online Pitch Detector
Use your microphone as a note finder and pitch checker. Identify musical notes, frequencies in Hz, and cents sharp or flat for voice or any instrument.
Note Detector, Pitch Checker, and Frequency Finder
PitchDetector.io turns your browser into an online note detector. Play a note, sing a pitch, or test an instrument and see the nearest note name, octave, frequency, and tuning offset.
Online Note Detector
Identify notes from voice, guitar, piano, trumpet, violin, flute, and other pitched sounds.
Pitch Checker
Check whether a sound is in tune, sharp, or flat with a cents meter that updates in real time.
Frequency Finder
Measure the frequency in hertz and map it to the closest chromatic note across a wide musical range.
How It Works
Allow Microphone
Click start and grant microphone access. Your audio stays in your browser.
Play or Sing
Play your instrument, sing, or hum. The detector picks up any pitched sound.
See the Note
Instantly see the detected note, frequency in Hz, and how many cents sharp or flat.
Why Use a Pitch Detector?
A pitch detector listens to sound and tells you exactly what note is being played. Unlike a tuner which targets specific notes, a pitch detector identifies any pitch across the full musical range.
Ear Training
Verify what note you're hearing or singing
Any Instrument
Works with guitar, piano, trumpet, voice, violin, flute, and more
Tuning Accuracy
See exactly how many cents sharp or flat a note is
Voice Analysis
Check your vocal pitch for singing practice
Instant feedback
C0 to B8 range
Cents accuracy
Audio stays local
Online Pitch Detector FAQ
How does this online pitch detector work?
The pitch detector listens through your microphone, analyzes the incoming sound in your browser, estimates the fundamental frequency, and maps that frequency to the nearest musical note.
Can I use it as an online note detector?
Yes. Play, sing, hum, or whistle a clear pitch and the tool shows the detected note name, octave, frequency in hertz, and whether the pitch is sharp or flat.
Is this a pitch checker or a tuner?
It works as a pitch checker for any pitched sound. It is broader than an instrument-specific tuner because it identifies whatever note it hears instead of targeting one preset tuning.
Does my audio leave my browser?
No. Microphone analysis happens locally with browser audio APIs, and the site does not upload or store your audio.