Back
Pitch / Hz Viewer
See the frequency and musical note of your sound (microphone).
Microphone is off
Audio is processed locally. No data is sent to any server.
Pitch / Hz Viewer: Guide
- Intent
- Use this pitch detector online to tune instruments: see Hz, note name, and cents in real time from your microphone input.
- What it does
- Analyzes microphone audio with autocorrelation to estimate frequency and display the closest note and cents offset.
- Key features
- Real-time Hz + note, Cents meter, Local-only mic processing
- Privacy
- Microphone audio stays in your browser and is never uploaded.
- Best for
- Quick tuning checks for guitar, violin, bass, and vocals
- Intonation practice when you want Hz + cents feedback (not just a needle)
- Anyone searching 'pitch detector Hz' or 'tuner online'
- Why this tool
- Shows Hz, note, and cents so you can correct pitch precisely
- Local microphone processing: no recordings uploaded
- Fast for quick checks without installing an app
How to use
- 1Click Start listening and allow microphone access.
- 2Play or sing a steady note.
- 3Read the note name and cents meter (negative = flat, positive = sharp).
- 4Click Stop listening when finished.
Common mistakes
- Denying microphone permission (the tool cannot measure pitch without it).
- Using it in a noisy room, which makes detection jumpy.
- Expecting perfect accuracy on very quiet, very low, or very distorted signals.
Examples
Tune to A4 (440 Hz)
Goal: A4
If you see ~440 Hz and 0 cents, you're in tune.
Quick guitar check
Pluck one string at a time.
Hold the note steady for the most stable reading.