Online Chromatic Tuner
Tune a single sustained note using your microphone and see the nearest chromatic note, frequency, cents deviation, and flat/in-tune/sharp status.
Press Start Tuner, allow microphone access, then play or sing one sustained note.
Standard concert pitch is A4 = 440 Hz. Adjust only if your ensemble or instrument uses another reference.
Microphone audio is analyzed locally in your browser by this plugin and is not uploaded for tuning. Stop Tuner releases the microphone stream.
An Online Chromatic Tuner helps you tune a musical instrument or check a sung note directly through your device’s microphone. Start the tuner, play one clear sustained note, and the tool detects the nearest chromatic note while showing its frequency, cents deviation, target frequency, and whether the pitch is flat, sharp, or in tune.
Because it is chromatic, the tuner is not limited to the standard strings of one instrument. It can recognize all 12 notes of the chromatic scale across a practical frequency range, making it useful for guitar, violin, ukulele, voice, wind instruments, and many other single-note tuning tasks.
How to Use the Online Chromatic Tuner
Select Start Tuner and allow microphone access when your browser asks for permission.
Then:
- Play or sing one sustained note.
- Watch the large detected note in the result area.
- Check the tuning meter and cents value.
- If the result says Flat, raise the pitch.
- If it says Sharp, lower the pitch.
- When the needle is near the center and the status reads In Tune, the detected pitch is close to the target note.
The default reference pitch is A4 = 440 Hz. You can adjust the reference between 420 and 460 Hz before starting the tuner when you need to match another tuning standard.
You can also choose whether accidentals appear as sharps or flats. For example, the same chromatic pitch may be displayed as C# or Db, depending on your preference.
For an instrument-specific workflow, you can also use the Guitar Tuner, Ukulele Tuner, or Violin Tuner.
Understanding the Tuner Results
The tuner provides several pieces of information for each detected pitch.
Detected note shows the nearest equal-tempered musical note, including its octave, such as A4, E3, or C#5.
Frequency shows the measured fundamental frequency in hertz. A4 at the standard reference is 440 Hz.
Cents tells you how far the detected pitch is from the nearest target note. One equal-tempered semitone contains 100 cents.
A negative cents value means the pitch is below the target and therefore flat. A positive value means it is above the target and therefore sharp.
Target frequency displays the calculated frequency of the nearest correctly tuned note according to your selected A4 reference.
The tool considers a reading within approximately ±5 cents of the target to be in its green In Tune zone. The exact cents reading remains visible so you can make a finer judgment yourself.
If you mainly need the frequency rather than tuning feedback, the Frequency Detector is a useful related tool.
How Chromatic Pitch Detection Works
The tuner analyzes a short sample of microphone audio and looks for a repeating waveform pattern associated with the fundamental frequency of the note.
It uses an autocorrelation-based approach to compare the audio signal with delayed versions of itself. A strong repeating interval can be converted into an estimated frequency.
Once the frequency is detected, the tuner calculates the nearest chromatic note relative to the selected A4 reference.
With A4 set to 440 Hz, note relationships follow equal temperament, where each octave doubles in frequency and is divided into 12 equal semitone steps.
The cents difference between the measured pitch and its target frequency can be expressed as:
Cents = 1200 × log₂(detected frequency ÷ target frequency)
You do not need to perform this calculation manually. The tuner converts the microphone signal into note, frequency, cents, and tuning status automatically.
If you already have a specific frequency and simply want to know its note name, use the Frequency to Note Converter. The reverse calculation is available through the Note to Frequency Converter.
What Does Flat, Sharp, and In Tune Mean?
A tuner compares your current pitch with the ideal target frequency.
If your note is flat, its frequency is slightly too low. On a string instrument, you generally need to increase the string’s pitch.
If the note is sharp, its frequency is too high and needs to be lowered.
In Tune means the reading falls inside the tool’s central tolerance zone around the target frequency.
For example, suppose you are aiming for A4 at 440 Hz:
- A reading below the target produces a negative cents value.
- A reading above the target produces a positive cents value.
- A reading close to 440 Hz moves toward zero cents.
For more detail on this tuning measurement, see what cents mean in music tuning.
What Is A4 = 440 Hz?
A4 is the A above middle C. The tuner uses 440 Hz as its default reference frequency.
Changing the A4 reference changes the target frequencies of every chromatic note. This is why a musician using a different concert-pitch standard may get slightly different target frequencies even though the displayed note names remain the same.
The tuner allows an A4 reference from 420 Hz to 460 Hz, so you can match ensembles, historical tuning preferences, or other reference standards when needed.
If you want to learn more about the default reference, read the guide to the A440 tuning standard.
Chromatic Tuner vs Instrument-Specific Tuner
A chromatic tuner detects the nearest note from the complete 12-note chromatic system. It does not assume that you are tuning a particular string or instrument.
An instrument-specific tuner can be more convenient when you want guidance for a fixed tuning such as standard guitar tuning.
For example, a guitar tuner can focus on E–A–D–G–B–E, while a chromatic tuner can also detect notes outside those open-string targets.
That makes the chromatic option particularly useful for:
- Alternate guitar tunings
- Fretted-note intonation checks
- Violin or other string practice
- Wind and brass instruments
- Vocal pitch practice
- Unusual instrument tunings
- Matching a reference note
For broader instrument-tuning options, try the Instrument Tuner or read the site’s instrument tuning guide.
Tips for Getting a Stable Tuner Reading
Play one note at a time. Chords contain several frequencies simultaneously and can make a monophonic tuner unstable.
Use a sustained tone rather than a very short sound. Allow the pitch to settle before making a tuning adjustment.
Reduce background noise, music, conversation, fans, and other competing sounds where possible.
Move closer to your microphone if the tool reports that the signal is too quiet.
For string instruments, pluck cleanly and allow the initial attack to settle slightly. Strong transient noise at the beginning of a note can momentarily make pitch tracking less stable.
Vibrato also causes the frequency to move above and below the central pitch. If you are checking tuning rather than musical expression, hold the note as steadily as possible.
Accuracy and Limitations
The tuner analyzes frequencies from approximately 45 Hz to 2000 Hz. Notes outside that working range are not intended for reliable detection.
Results can also be affected by:
- Microphone quality
- Background noise
- Reverb
- Weak signals
- Strong harmonics
- Distortion
- Vibrato
- Rapidly decaying notes
- Multiple notes played simultaneously
- Device and browser audio behavior
A strong harmonic can occasionally be mistaken for the fundamental frequency, particularly with complex instrument tones.
The tuner is therefore best treated as a practical browser-based tuning aid rather than laboratory measurement equipment.
For another way to evaluate how closely a note matches a target pitch, try the Pitch Accuracy Checker.
Microphone Privacy and Browser Processing
Microphone access begins only after you select Start Tuner.
The plugin processes the incoming microphone signal locally in your browser for pitch detection. It does not create an audio recording or upload your microphone audio to the website server for analysis.
Selecting Stop Tuner stops the active microphone tracks and closes the audio-processing session. The tool also releases the microphone when the page is left where supported by the browser.
If microphone permission is blocked, enable microphone access for the site in your browser settings and start the tuner again.
Frequently Asked Questions
What is a chromatic tuner?
A chromatic tuner detects the nearest note among all 12 pitches in the chromatic scale instead of limiting detection to the normal tuning of one instrument.
Can I use this tuner for guitar?
Yes. It can detect individual guitar notes, including notes used in standard and alternate tunings. A dedicated guitar tuner may be simpler when you only need standard string targets.
What does 0 cents mean?
Zero cents means the measured frequency matches the calculated target frequency for the nearest note.
How many cents is considered in tune?
This tool uses an approximately ±5-cent central zone for its In Tune status while continuing to display the actual cents deviation.
Why does the tuner keep changing notes?
The signal may be too quiet, noisy, unstable, polyphonic, or rich in competing harmonics. Play one sustained note and reduce background sound.
Can I tune my voice with a chromatic tuner?
Yes. Sing one steady note and the tuner can show the closest chromatic note and your cents deviation. Natural vibrato may cause the reading to move.
Can I change A4 from 440 Hz?
Yes. The reference can be adjusted from 420 to 460 Hz before starting the tuner.
Does the tool record my microphone audio?
No recording file is created by the tuner. The live microphone signal is analyzed locally in the browser to estimate pitch.