Monophonic Pitch and Tuner Analyzer

Estimate note pitch and cents from a mono WAV containing one clear note at a time.

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How this works

The tool runs in this browser. Your file or text is not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

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Analyze pitch controls

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RIFF WAV, mono/stereo, PCM16/24/32 or float32, 8-96 kHz. Up to 128 MiB and 600 seconds.

    How to use Monophonic Pitch and Tuner Analyzer

    1. Choose a mono WAV with one sustained note at a time.
    2. Set your A4 reference and minimum periodicity confidence.
    3. Analyze the recording and separate accepted estimates from weak or ambiguous frames.

    Example: Monophonic Pitch and Tuner Analyzer

    Check a reference A note.

    You add
    One-second mono WAV at 48 kHz with a 440 Hz sine at amplitude 0.5. A4 reference: 440 Hz; minimum confidence: 0.9.
    You get
    Accepted steady frames identify A4 near 440 Hz and zero cents. Leading or weak frames may be rejected rather than assigned a note.

    Options

    A4 reference
    This is the comparison frequency for the A4 note. Changing it shifts the note and cents comparison without changing the recording.
    Minimum periodicity confidence
    Raising the threshold rejects more uncertain frames. It cannot make chords or ambiguous harmonics into reliable monophonic estimates.

    Supported inputs and limits

    Selected files128 MiB total
    Supported duration600 seconds
    RIFF WAV only: mono/stereo PCM16, PCM24, PCM32 or float32 at 8–96 kHz; up to 128 MiB and 600 seconds. Compressed WAV, extended headers and other containers are refused. Work stays on your device. Mono input only; bounded periodic pitch analysis. Chords, percussion, noise, weak signals and ambiguous frames are not reliable tuning inputs. No live microphone or pitch correction. Estimates are limited to 60–1,200 Hz in 128 ms windows, with at most 256 sampled windows. Confidence measures periodicity, not probability.

    Where your input is processed

    This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

    Cents compare the signal with your reference

    A cents value describes distance from the closest equal-tempered note under the selected A4 reference. Changing that reference changes the comparison, even when the recorded frequency stays the same. It does not retune or rewrite the source recording.

    Confidence is part of the result

    Periodicity alone cannot prove the intended musical note. Harmonics and changing notes can make estimates ambiguous. Review rejected frames and use a clear sustained passage rather than averaging everything into an apparently precise tuning claim.

    Questions about Monophonic Pitch and Tuner Analyzer

    Can it identify all notes in a chord?

    No. It is designed for a single periodic note in mono audio.

    Does a rejected frame mean the note is out of tune?

    No. It means this analysis did not accept a reliable single-note estimate for that frame.

    Is my input uploaded?

    Nothing is uploaded.

    Project manager: Tony Hines · Content updated 4 October 2026 · Report a problem