Change the pitch or key of any song, keeping its tempo
This audio pitch changer moves a recording up or down in pitch while keeping its speed and length exactly the same. Transpose a backing track into a key that suits your voice, tune a recording to match an instrument, lower a song so a karaoke night is less of a strain, or shift a sample to fit a beat — then save the result as MP3, M4A, WAV, FLAC or OGG.
Choose a number of semitones (from two octaves down to two octaves up) with cents for fine tuning, or simply pick the song’s key and the key you want. Turn on Preserve formants and a voice keeps its natural character instead of sounding like a cartoon when shifted up or a giant when shifted down.
The file never leaves your device: decoding, pitch shifting and encoding all run in your browser, so you can use it on unreleased songs and private recordings.
How to use the Audio Pitch Changer
- Drop an audio file onto the box or click to choose one; its length, sample rate, loudness and peak level are shown with the original in the Before player.
- Set Semitones (and Fine tune in cents if you need it), use a quick button such as −2 or +12, or choose Song key and New key.
- Pick a Method — phase vocoder for music, WSOLA for a solo voice — and tick Preserve formants for natural-sounding vocals.
- Press Preview to hear eight seconds from the marker; tap the waveform to move it. Changes update the preview while it plays.
- Choose the output format and quality, press Change pitch, check the After player and press Download.
Audio Pitch Changer features
±24 semitones plus cents
Whole semitones for key changes and cents (hundredths of a semitone) for matching a slightly detuned recording to an instrument.
Key-to-key transposing
Pick the original and the new key and the shortest interval is worked out for you — C to D is +2, C to B♭ is −2.
Speed stays the same
The audio is time-stretched by the pitch ratio and then resampled back, so the length matches the original sample for sample.
Formant preservation
An optional spectral-envelope correction keeps a voice’s vowel colour in place, so shifted singing still sounds like the same singer.
Two engines
A phase vocoder with identity phase locking for chords and full mixes, and WSOLA for clean, punchy solo voices and speech.
Preview, compare, export
An eight-second live preview, before/after players and export to MP3, M4A, WAV, FLAC or OGG Vorbis.
Semitones and frequency
A semitone is one step on a piano keyboard, and in equal temperament each one multiplies every frequency by the twelfth root of two (about 1.0595). Twelve semitones double the frequency — one octave. A cent is a hundredth of a semitone, so 100 cents = 1 semitone.
| Shift | Frequency ratio | A4 (440 Hz) becomes | Musical name |
|---|---|---|---|
| +1 | × 1.0595 | 466.2 Hz (B♭4) | Minor second up |
| +2 | × 1.1225 | 493.9 Hz (B4) | Whole tone up |
| −3 | × 0.8409 | 370.0 Hz (F♯4) | Minor third down |
| +5 | × 1.3348 | 587.3 Hz (D5) | Perfect fourth up |
| −7 | × 0.6674 | 293.7 Hz (D4) | Perfect fifth down |
| +12 | × 2 | 880 Hz (A5) | Octave up |
Choosing a key for singing
If a song sits too high, lower it one or two semitones at a time until the highest note feels comfortable; most singers find their range within ±3 semitones of the original. Not sure what key the song is in? The Key Finder estimates it, and an Online Tuner helps you check your own range.
Large shifts change the character of the sound: beyond about ±5 semitones instruments start to sound unnatural even with good processing, and voices need formant preservation to stay believable.
What formant preservation does — and its limits
Formants are the resonances of the throat and mouth that make an “ah” sound different from an “ee”. Raising the pitch with plain resampling moves the formants up too, which is what makes the chipmunk sound. With Preserve formants on, each short frame’s spectral envelope is traced through its harmonics and re-shaped so the resonances stay at their original frequencies while the notes move.
It works best on a single voice or instrument. On full band mixes it can colour the sound slightly, so compare with the preview. For deliberate character voices — deeper, squeakier, robotic — try the Voice Changer, and to change tempo rather than key use the Audio Speed Changer.
Audio Pitch Changer FAQ
How do I change the key of a song without changing the speed?
Open the song, choose the Song key and New key (or type the number of semitones) and press Change pitch. The pitch shifter time-stretches and resamples the audio so the tempo and length stay exactly the same.
Is this audio pitch changer free?
Yes — free, with no sign-up, watermark or upload. All processing happens on your device.
How many semitones should I lower a song for my voice?
Usually one to three. Try −1 or −2 with the preview and sing along with the highest part; repeat until it feels comfortable.
Why does my voice sound like a chipmunk after shifting up?
Because the vocal formants moved up with the pitch. Tick Preserve formants to keep them in place, which keeps the voice natural.
Which method should I use?
Use the phase vocoder for music with chords, pads or several instruments, and WSOLA for a single voice, speech or a solo melody line. Formant preservation always uses the phase vocoder.
Can I fine-tune a recording to A = 440 Hz?
Yes. Use Fine tune in cents: a recording tuned to 432 Hz needs about +32 cents to reach 440 Hz (1200 × log₂(440 ÷ 432) ≈ 31.8).