Raise or lower the pitch of a song or voice by semitones without changing its speed
Processed in your browser. Nothing is uploaded. Checked against sources on 16 Oct 2026.Audio Pitch Changer moves a song or voice up or down by up to 12 semitones in your browser, keeping its speed, so a backing track can be put in a key that suits your voice. Each semitone multiplies every frequency by about 1.059. Nothing is uploaded and the result downloads as a WAV.
Press Choose an audio file or drop the song or recording on the page; it is decoded on your device.
Drag the Pitch slider or press −1 and +1: each step is one semitone, and 12 is an octave.
Leave Keep the speed on to change only the pitch, or switch it off for the faster-and-higher tape effect.
Press Change pitch, compare the before and after players, then press Download.
Singers move songs into a comfortable key, musicians practise along with a recording tuned differently from their instrument, and editors disguise a voice or make a sound effect deeper. All of them need the pitch to move while the tempo stays where it was.
Semitones, in numbers. Western music divides each octave, a doubling of frequency, into 12 equal semitones, so one semitone multiplies every frequency by 2 to the power of 1/12, about 1.0595.
| Change | Frequency ratio | A4 (440 Hz) becomes |
|---|---|---|
| +1 semitone | 1.059 | 466 Hz (B flat) |
| +7 semitones | 1.498 | 659 Hz (E) |
| +12 semitones | 2.000 | 880 Hz (A5) |
| -12 semitones | 0.500 | 220 Hz (A3) |
How it works. The audio is first time-stretched without changing its pitch, using overlapping slices that are lined up so the waveform continues smoothly (WSOLA), and then resampled, which brings the length back and moves every frequency by the chosen ratio. The output has exactly the input's number of samples. Every setting was checked by measuring the pitch of shifted test tones with a separate Goertzel filter.
Keep the speed off. Without the stretch, the audio is simply played faster or slower like a tape: higher and shorter, or lower and longer. It sounds cleaner on big shifts but changes the tempo.
Limits. Half-semitone steps from -12 to +12, files up to 300 MB or one hour. The result is a 16-bit WAV at the file's own sample rate. Shifts past about five semitones with the speed kept start to sound processed, as they do in any pitch shifter. Nothing is uploaded.
Drop the song on Audio Pitch Changer, move the Pitch slider to the number of semitones you want, keep Keep the speed switched on and press Change pitch. The result has exactly the same length as the original and downloads as a WAV. MP3, M4A, WAV, OGG and FLAC files work.
One semitone is one piano key, including the black keys. From C, +2 reaches D, +5 reaches F and +7 reaches G; -12 or +12 is a whole octave and keeps the key name. Most singers need between two and four semitones to bring a song into a comfortable range.
Keeping the speed while moving the pitch means the sound has to be cut into short overlapping slices and stretched before it is resampled. Shifts of up to about five semitones sound natural on most music; past that, voices start to sound processed. Switching Keep the speed off avoids it, but changes the tempo too.
The audio is played faster or slower like a tape or record, so pitch and speed move together: +12 semitones plays twice as fast and an octave higher, which is the chipmunk or nightcore sound, and -12 plays at half speed an octave lower. Nothing is stretched, so the sound stays clean.
The result is an uncompressed 16-bit WAV at the original sample rate, so no further compression is added. The pitch change itself alters the sound by design, and large shifts with the speed kept add some smearing. At zero semitones the page does nothing, and the button stays off until a change is chosen.
No. The file is decoded, shifted and written by your own browser, and the WAV is created on your device. Nothing is sent to a server, which keeps unreleased songs and private recordings private. Up to 300 MB or one hour of audio fits in a browser tab.
Rates and rules change; check the source before you rely on a figure.
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Same job, other tools: Frequency Generator – Generate a steady test frequency for speakers, headphones or instruments · Sweep Tone Generator – Sweep smoothly between two frequencies over a time you choose · High Frequency Hearing Check – Screen the top tones, 4 kHz and 8 kHz, ear by ear, then test higher with a tone generator · Audio Sweep Generator – Play a slow logarithmic sweep and hear every rattle in the room.
On the related tools: Mic Test – See your voice on a live waveform and hear it played straight back.