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See Your Pitch Over Time

Sing or play into your microphone, or drop in an audio file, and watch the pitch drawn as a line over time on a piano-roll grid. Get note names, your range, an estimated key and the most used notes, then export the notes as MIDI or the data as CSV. Everything runs in your browser.

Pitch detection runs in this tab. Microphone audio and files are analysed on your device and never uploaded.

How pitch over time is measured

The detector cuts the sound into short overlapping frames, about 60 times a second for the microphone and every 16 milliseconds for a file. For each frame it uses the YIN method, an autocorrelation-style technique that looks for the shortest repeating period in the waveform and converts it to a frequency in Hz. The same approach powers the tuner and vocal range test on this site. A confidence value tells how clearly periodic the frame was.

Frames that are too quiet or not clearly periodic are treated as unvoiced and left out of the plot. The remaining pitches are converted to note numbers relative to your chosen A4, then smoothed with a short median filter so single wrong frames, such as an octave jump, do not draw spikes. The result is a pitch contour drawn on a piano-roll grid with note names on the vertical axis and time across.

What you get from a take

From the contour the tool reports the lowest and highest notes that were held for more than a moment, the average pitch, a histogram of the most frequent notes, and a histogram by pitch class. The pitch-class histogram is compared with the Krumhansl major and minor key profiles to estimate a key, with the next best candidates shown because relative keys often score closely.

Stable stretches of pitch are grouped into notes. A note stays one note through normal vibrato and ends when the pitch moves by more than about three quarters of a semitone, or the sound stops. Those notes can be exported as a MIDI file, and every voiced frame can be exported as CSV with time, frequency, note name, cents and confidence for analysis in a spreadsheet.

Limits and good practice

A single-pitch detector assumes one note at a time. Use a solo voice or instrument recorded close to the microphone in a quiet room. Polyphonic music, heavy reverb, strong backing tracks and very breathy or distorted sounds will produce gaps or wrong octaves. Very low or very high notes outside roughly 55 Hz to 2000 Hz are not searched.

Adjust the confidence threshold and smoothing to taste: higher values give a cleaner but sparser line, lower values keep more of the take. Use the microphone for quick checks and warm-ups, and files for studying a recorded performance, comparing takes, or sketching a melody into MIDI.

Pitch detector blueprint

What goes in, what comes out, and where it stops working.

InputLive microphone, or an audio file up to 10 minutes and 100 MB.
OutputPitch contour on a piano-roll grid, current note and cents, range, average, note histograms, estimated key.
MethodYIN pitch detection per frame, confidence gating, median smoothing, note segmentation.
Range/LimitsAbout 55 Hz to 2000 Hz, one pitch at a time. A4 adjustable from 432 to 446 Hz.
ExportsMIDI file of the stable notes, CSV of every voiced frame.
Best forSolo vocals and single instruments: checking intonation, vibrato, melody sketches, practice review.

How to Detect Pitch Over Time

Three steps, all inside your browser

  1. 01

    Pick microphone or file

    Use the Microphone tab for a live scrolling trace, or the File tab to analyse a whole recording. Files are analysed on your device in a background worker, with a progress bar.

    This works best on one voice or one instrument at a time. Chords and full mixes confuse a single-pitch detector.

  2. 02

    Read the pitch line

    The line shows the note being sung or played against time. Frames the detector is not confident about are hidden, and the rest is smoothed. For a file, press play and a red playhead follows the audio.

    If the line is jumpy, raise the confidence threshold or the smoothing. If notes are missing, lower the threshold.

  3. 03

    Check the numbers and export

    See your lowest and highest note, average pitch, the most frequent notes, an estimated key and the reference pitch A4 you can set from 432 to 446 Hz. Download the stable notes as a MIDI file or every frame as CSV.

    Set A4 to match the recording first, for example 432 Hz, so the cents readout is meaningful.

Free Audio Tools

Pitch Detector Questions

How pitch over time is measured, and its limits

Monophonic audio: a single voice or a single instrument playing one note at a time, recorded reasonably cleanly. It tracks one pitch per moment, so chords, backing vocals and full mixes give unreliable or missing results. Try an isolated vocal stem if you have one.
The tuner shows a needle for the note right now. The pitch detector keeps the history, drawing pitch against time so you can see vibrato, slides, drift and phrasing, and then summarises the whole take with range, key and note statistics.
The vocal range test asks you to hold your lowest and highest notes and reports only those. The pitch detector analyses anything you sing, play or upload, and shows the full contour, a note histogram and exports.
No. Microphone audio and files are analysed on your device. Nothing is recorded to a server, and closing the tab clears the results.
Silence, breath, consonants and noisy moments have no clear pitch, so they are hidden rather than guessed. If too much is hidden, lower the confidence threshold; if the line is full of stray points, raise it.
Yes. A4 can be set from 432 to 446 Hz. Note names and cents are calculated against that reference, which helps with recordings tuned to 432 Hz, 442 Hz and similar.
Frames with a steady pitch are grouped into notes, so vibrato stays inside one note and short blips are dropped. The notes are written to a standard MIDI file at 120 BPM with their real timing. Treat it as a draft to clean up in a MIDI editor, not a perfect transcription.
The tool counts how often each of the twelve pitch classes occurs and compares that profile with the Krumhansl major and minor key profiles. It is a good guess for melodies with enough notes, and may confuse a key with its relative major or minor.

More tools for your recordings

Tune up, test your range or turn audio into MIDI.

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