Free Online Pitch Detector: Find the Note You Sing or Play

ToMIDI is a free online pitch detector. Sing, hum or play one note and it shows the note name and octave, the frequency in Hz and how many cents sharp or flat you are, live from your microphone. Open an MP3 or WAV to see the pitch curve and every note of a recording, or find your vocal range. It all runs in your browser: no install, no sign-up, and nothing you sing is recorded or uploaded.

Note, Hz and Cents Live
Free, No Sign-up
Nothing Uploaded
Notes From MP3 Files

A4440Hz

Sing or play a note to see its pitch

Live note name, cents and frequency from your microphone. Nothing is recorded or uploaded.

Runs in your browser, nothing is uploaded
Free, no sign-in
About 40 Hz to 2 kHz

Reads one note at a time from about 40 Hz to 2 kHz. Chords, backing tracks and loud rooms make the reading jump.

Turn your singing into MIDISing or hum a melody and get a MIDI file and sheet music in the browser.Voice to MIDI Tune your instrumentGuitar, bass, ukulele, violin and cello presets with auto string detection.Open

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What an Online Pitch Detector Shows You

A pitch detector listens to one sound and tells you which note it is. Hold a note and the large readout names the nearest note with its octave, such as A3 or C♯4, then adds the frequency in hertz, the cents between you and that note, and its MIDI number. Under it, a pitch graph scrolls so you can watch every slide, wobble and held tone. That makes it a note identifier by sound for a voice, a guitar string, a whistle, a bell or a synth patch: the quick answer to "what note is this?". It hears one pitch at a time, so give it a single voice or instrument. For chords and whole songs, start from the free audio to MIDI converter.

Start the Pitch Detector

Why Use ToMIDI as Your Note Finder

Six things this note finder does that a plain online note detector or a phone tuner often leaves out.

Note, Hz, cents and MIDI number
Every reading shows the note name, octave, frequency to a tenth of a hertz, cents sharp or flat and the MIDI number, so you can type the note straight into a DAW.
A pitch graph you can freeze
The scrolling graph draws your pitch over semitone lanes. Press Hold, or the H key, to freeze the readout and the graph and read a note you just sang.
Notes from a recording
Open an MP3, WAV, M4A or FLAC and get the pitch curve, a note list with start, length, Hz and cents, and downloads as CSV or MIDI.
Vocal range test
Sing your lowest and highest comfortable notes and see your range on a keyboard, with the closest voice type from bass to soprano.
Private by design
The microphone is analysed inside this tab. Nothing is recorded, saved or uploaded, and the files you open never leave your device.
Free, nothing to install
No account, no credits and no music note identifier app to download. It works in current desktop and mobile browsers.

How to Use the Online Pitch Detector

From opening the page to reading your first note takes a few seconds. Here is the whole path.

Press Start and allow microphone access when the browser asks. No account is needed. Pause any music first, because the detector hears everything the microphone hears.
Pluck a single string, whistle, hum or sing. Note detector readings appear as soon as the sound is clear, and settle when you hold the note steady close to the microphone.
Read the note name, octave, Hz and cents. Press Hold or H to freeze the readout and the graph while you write the note down or check it against a score.
Use the tabs to analyse a recording instead, or run the vocal range test. Your A4 setting and your choice of sharps or flats are remembered in this browser.

Step 1 · Press Start and allow the microphone

Everything the Note Finder Can Do

Five tools in one music note detector, all built on the same pitch detection engine.

A live note identifier with a cents needle

The readout is a note identifier and a tuner in one. The needle swings left when you are flat and right when you are sharp, and you can pick sharps or flats so a B♭ reads as B♭, not A♯. For singing practice, choose a target note from C2 to C6 and play it: the needle then measures you against that note, the trace turns green within 10 cents and a meter fills while you hold it for two seconds. A Steady badge appears once a held note settles, and the session keeps your lowest and highest notes. As a singing pitch detector it shows your pitch and never changes your voice.

Try a Target Note

A pitch graph that shows every slide and wobble

One number cannot show how a note moves. The scrolling graph turns voice pitch detection into a line over semitone lanes, so a scoop into a note, vibrato around it or a note that sags as your breath runs out is easy to see. Press Hold to freeze it, then carry on. Turn on Noisy room when a fan or traffic adds stray readings. Guitarists use the same view to watch a bend reach its target.

Watch Your Pitch Live

Find the notes in an MP3, WAV or voice memo

Switch to the file tab and the tool becomes a note finder from MP3 files and other recordings. The file pitch detector (MP3, WAV, M4A, AAC, FLAC, OGG, Opus, WebM and the sound of MP4 or MOV videos) takes files up to 100 MB and analyses the first 10 minutes. You get the pitch curve with a synced player, a note list with start, length, note, Hz and cents, a play button on every note, and CSV or .mid downloads. The MIDI is one melody line. For quantize and sheet music, open the same file in voice to MIDI or guitar to MIDI.

Analyse a Recording

A vocal range test with your voice type

Sing down to your lowest comfortable note, then up to your highest, and the test marks both on a keyboard and estimates the closest voice type: bass, baritone, tenor, alto, mezzo-soprano or soprano. Save the result as an image to share with a teacher. No microphone handy? A short demo walks through the test with a synthesised voice. Treat the type as a starting point: teachers also listen to tone colour and where your voice feels easy, and most singers gain a few notes at each end with practice.

Test Your Vocal Range

Calibrate A4 and hear any reference note

Every note name is worked out from one reference pitch, A4. It starts at 440 Hz, the standard for nearly all recorded music, and you can set anything from 415 to 466 Hz: 442 for many orchestras, 432 if your group uses it, 415 for baroque pitch. Tap any key from C2 to C6 on the on-screen keyboard to hear it as a reference tone, then sing it back and check yourself. Pair it with a metronome for scale practice in time.

Open the Pitch Detector

What Notes Are These? Real Pitch Curves From Three Recordings

Three short public-domain clips, run through the same pitch detection code as the file tab. Pick one, press play, and move across the graph to read the note, Hz and cents at any moment.

Move across the graph or press play to read the pitch at any moment.

G3C4G4C5

Lowest: F3
Highest: C5
Range: 19 semitones
Most common: B3
Notes: 51
Clear pitch: 87% of frames

pitch curve detected noteReal output · recording by PSsoundproject (CC0)

What you are looking at

Nothing here is drawn by hand: each line is the pitch the engine found, frame by frame at A4 = 440 Hz, and each bar is a note from its note list. The hum runs from F3 to C5, with a clear pitch in 87% of frames and 51 notes. The walking bass, played on a guitar, spans E2 to G♯3 in 52 notes. The guitar solo is mostly chords and double stops, so the detector finds a single clear pitch in only 8% of frames and stays quiet elsewhere. That is the honest limit of any single note pitch detector.

Try It Yourself

How Accurate Is Pitch Detection Online?

With one voice or one instrument in a quiet room, the reading is steady. So far we have measured synthetic test tones only, in Edge: 440 Hz read as 440.0 Hz, and 435 Hz read 20 cents flat against a true 19.8. Real voices and microphones are harder, and we quote no figure for them until we have tested them, so here is what moves the result instead. The detector covers about 40 Hz to 2 kHz, roughly E1 to B6. The engine uses the McLeod Pitch Method: it looks for how often the sound repeats rather than for its loudest frequency, which keeps it from reading most notes an octave too low, and it stays silent when a sound is too unclear to name.

Chords, duets and full songs have no single pitch to name, so the reading jumps or goes quiet. Use the chord finder for chords.
Singing over a backing track: the microphone hears the music too. Play references through headphones.
Very low notes, around A1 and below, take longer to settle, and small laptop or phone microphones pick up little of them.
Breathy, very short or very quiet sounds may show no note at all. Showing nothing beats showing a wrong note.
A weak fundamental with strong overtones can slip an octave for a moment. Sing on an open vowel, closer to the microphone.
Room echo keeps the last note ringing after you change pitch. A smaller, softer room gives cleaner readings.

Test It With Your Voice

Tips for Steady Voice Pitch Detection

Your microphone and your room matter more than the maths. Four habits that make this singing note detector steadier.

Sing on an open vowel

An "ah" or "oo" gives a clear, repeating tone. Consonants and breath add noise that the detector has to ignore before it can name the note.

Stay 15 to 30 cm from the mic

A hand to a forearm away keeps your voice louder than the room. On most phones the microphone sits on the bottom edge, next to the charging port.

Hold each note

Give a note a moment to settle before you read it, then press Hold to freeze it. Short blips are filtered out on purpose, so a held tone always reads best.

Check against a reference

Play a reference tone through headphones, then sing it back. For intervals, the interval calculator tells you how many semitones to expect.

Frequency to Note Chart: Hz to Note at A4 = 440 Hz

The pitch detector does this conversion live, but a Hz to notes chart is handy for sound design, synth tuning and checking a sample. Each octave doubles the frequency, and the formula is note = 69 + 12 × log2(Hz ÷ 440), where 69 is A4 and 60 is middle C (C4).

Frequency to Note Chart: Hz to Note at A4 = 440 Hz
	Octave 2 (Hz)	Octave 3 (Hz)	Octave 4 (Hz)	Octave 5 (Hz)
C	65.41	130.81	261.63	523.25
C♯ / D♭	69.30	138.59	277.18	554.37
D	73.42	146.83	293.66	587.33
D♯ / E♭	77.78	155.56	311.13	622.25
E	82.41	164.81	329.63	659.26
F	87.31	174.61	349.23	698.46
F♯ / G♭	92.50	185.00	369.99	739.99
G	98.00	196.00	392.00	783.99
G♯ / A♭	103.83	207.65	415.30	830.61
A	110.00	220.00	440.00	880.00
A♯ / B♭	116.54	233.08	466.16	932.33
B	123.47	246.94	493.88	987.77

Who Uses a Music Note Identifier

Anyone who hears a note and wants its name. A music note finder for singers, players, producers and students.

Singers and voice teachers

A voice pitch detector for long tones and sirens: land in the middle of each note, map a student's range in a minute, and see whether vibrato sits centred on the pitch.

Guitarists and bassists

Check a bend, a harmonic or a single string. To tune every string with presets such as Drop D, the online tuner is faster.

Songwriters

A song note identifier for melodies you hum: sing the line one note at a time and write the names down, or open the voice memo in the file tab and read the whole note list.

Producers and sound designers

Find the root note of a sample, a bass hit or a bell before you tune it to the track, then confirm the song's key with the key finder.

Music students

A free note detector music students can use for ear training: sing an interval, see where it landed, and connect what you hear with note names, octaves and Hz.

Piano and keyboard players

A piano note finder for single keys and a piano note identifier for old recordings: play one note and see how far the instrument sits from A4 = 440 Hz.

Pitch Detector FAQ

Real questions about finding notes by sound, answered plainly, limits included.

How do I find out what note I am singing?

Press Start, allow the microphone and sing one steady note on a vowel. The pitch detector names the nearest note and octave, such as G3 or C♯4, with its frequency in Hz and how many cents sharp or flat you are. Press Hold to freeze the reading so you can write it down.

Is this online pitch detector free?

Yes. There is no account, no credit system and no cap on how often you use it, and nothing to install. Live mode needs a browser with microphone access; the file tab and the demo melody work without one.

Can I find the notes of a song from an MP3?

Yes, when the part you want is on its own. Open the file and the tool draws the pitch curve and lists every note with its start, length, Hz and cents. It follows one pitch at a time, so it works as a song note finder for a solo voice or one instrument, not as a full song note detector for a mix. For songs with chords and drums, use MP3 to MIDI, which is built for mixes.

Can it identify notes from instruments, not just voice?

Yes. Use the note finder: piano, guitar, bass, violin, flute, a whistle or a synth all work as long as one note sounds at a time, from about 40 Hz to 2 kHz. Let the note ring past its attack, because the first instant of a pluck or a strike is noisy.

How do I convert Hz to a note?

Use note = 69 + 12 × log2(Hz ÷ 440), round to the nearest whole number for the note and keep the remainder as cents. 440 Hz gives 69, which is A4, and 261.63 Hz gives 60, middle C. This page is a live Hz to note converter, and the chart above lists every note from C2 to B5 for quick Hz to note conversion by hand.

What do cents mean on a pitch detector?

A cent is one hundredth of a semitone, so an octave has 1,200. A 440 Hz note reads A4 at 0 cents; +20 means a little sharp and -40 means close to halfway down to the next note. A few cents off is hard to hear on its own, but it beats against other instruments in a chord.

How accurate is the pitch detector?

For one clear voice or instrument in a quiet room, the reading is steady. On synthetic test tones in Edge, 440 Hz read as 440.0 Hz and 435 Hz as 20 cents flat (true value 19.8). It gets less reliable with background music, several notes at once, very low notes and breathy or very short sounds, and we quote no accuracy figure for real voices or microphones until we have tested them.

Can it detect chords or several notes at once?

No. It is a single note pitch detector, so a chord or a strum makes the reading jump or go quiet, as the guitar solo sample above shows. Play the notes one by one, or name the chord with the chord finder.

Why does the detected note sometimes jump an octave?

When the fundamental is weak and an overtone is strong, for example on breathy notes, through a small speaker or on very low notes, the repeating pattern can look like the note above. The tracker holds back sudden octave jumps until they last, which removes most slips; singing on a vowel, closer to the mic, removes the rest.

What is the difference between a pitch detector, a tuner and a key finder?

A tuner compares one note with a target, such as a guitar string, and tells you which way to turn. A pitch detector names whatever note it hears and adds the graph, file analysis and the range test. A key finder looks at a whole song to estimate its key. For instruments use the online tuner; for songs, the key finder.

Can I use it as a voice tuner or vocal tuner for singing?

Yes. Pick a target note, play it, then sing it back: the needle and the trace show how close you are, turning green within 10 cents, and a meter fills while you hold the note for two seconds. Think of it as a singing tuner online, not Auto-Tune: it shows your pitch and never changes your voice.

How do I find my vocal range?

Open the range test, sing down slowly to your lowest comfortable note, then up to your highest without straining. The test keeps both notes, shows the span on a keyboard and estimates the closest voice type, which you can save as an image. It is an estimate from range, not a diagnosis. You can also type in notes you already know, or watch the demo first.

Can I export the detected notes as MIDI?

Yes, from the file tab: download the notes as a .mid file, or the note list and the pitch curve as CSV. The MIDI holds one melody line with its original timing. To quantize, snap to a key and print sheet music, open the same recording in voice to MIDI.

Is my microphone audio recorded or uploaded?

No. Live audio is analysed inside this browser tab and is never recorded, saved or sent to us, and the files you open are decoded on your device. Stop releases the microphone at once, and so does hiding the tab. Only your settings, such as A4, stay in your browser.

Is there a music note finder app I need to install?

No. This page is the app to identify notes by sound: it runs in Safari, Chrome, Edge and Firefox on iPhone, Android and desktop, over https. If you blocked the microphone, allow it in the site settings from the address bar and press Start again.

Why does the pitch detector show nothing?

Check the level meter first, as you would in an online mic test. Pitch detector readings appear only for a clear tone, so a quiet, breathy or noisy sound shows no note. Move closer, hold the note longer and pause other audio. Still nothing? Try the demo melody to confirm the page works.