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Instrument Tuner.

A real-time chromatic tuner estimate for guitar, bass, ukulele and violin. Useful for a quick check, but not calibrated test equipment.

Before-and-after illustration of Instrument Tuner: Live instrument note becomes Tuning guidance through Estimate fundamental.
Before → process → afterSee the signal story, then hear it in the workspace.

MEASUREMENT MAP

Pitch Cents Dial

Turn a signal into evidence you can inspect. A useful analyzer connects the raw trace, the measurement window and a clearly labeled result without pretending that one number explains the whole recording.

Before-and-after illustration of Instrument Tuner: Live instrument note becomes Tuning guidance through Estimate fundamental.
Live instrument noteEstimate fundamentalTuning guidance
An analysis path: a bounded signal window produces comparable metrics and a visual trace while preserving the context needed to interpret them.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
  1. Live instrument note

    Start with the right material

    Quick guitar, bass, ukulele, violin and single-note tuning checks.

  2. Estimate fundamental

    Understand the transformation

    Local autocorrelation searches roughly 50 to 1500 Hz and maps the estimate to equal-tempered notes.

  3. Tuning guidance

    Verify the usable result

    A live note name, measured frequency and cents guidance.

Cents offset

Where this workflow stops

It is not calibrated laboratory equipment. Background sound, overtones and low notes can cause unstable or octave-shifted readings.

THREE-PASS CHECK

Make the final decision by ear

  • Use the same window and settings when comparing two files.
  • Treat estimates as evidence, not as a substitute for listening.
  • Export or note the measurement context alongside the result.

How to tune your instrument

  1. Choose your instrument preset — Guitar, Bass, Ukulele, Violin or Chromatic.
  2. Press “Start tuner” and allow microphone access when your browser asks.
  3. Play one string or note; read the detected note, the Hz and how many cents you are off.
  4. Turn the peg until the needle centres and turns green within five cents, then move to the next string.

This tuner estimates fundamental frequency from microphone input between roughly 50 and 1500 Hz, then maps it to the nearest note and cents offset. Microphone response, room noise, overtones and octave errors can move the reading. Use it as a quick local reference and confirm with calibrated equipment when tuning precision matters.

Instrument Tuner: quick answer and technical limits

Quick answer: A real-time chromatic tuner that estimates a microphone signal’s fundamental frequency and displays the nearest note and cents offset.

Best for
Quick guitar, bass, ukulele, violin and single-note tuning checks.
How it works
Local autocorrelation searches roughly 50 to 1500 Hz and maps the estimate to equal-tempered notes.
What you get
A live note name, measured frequency and cents guidance.

Know before you use it: It is not calibrated laboratory equipment. Background sound, overtones and low notes can cause unstable or octave-shifted readings.

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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, private and calibrated?
It is free with no signup and analyzes microphone audio locally. It is not calibrated: microphone response, noise, overtones and octave errors can affect the reading, so use calibrated equipment when tuning precision is critical.