Audio Pitch Shifter
A free online audio pitch shifter. Move an MP3, WAV or M4A up or down by semitones without changing its speed or length, and download the result as an MP3. Runs in your browser with ffmpeg — your file is never uploaded.
How do I change the pitch without changing the speed?
To re-pitch audio, load your file, set how many semitones to move it — up to raise the pitch, down to lower it — and press Shift pitch. The tool changes the pitch while keeping the tempo and length the same, then hands you an MP3. Twelve semitones is one octave; use a few semitones to transpose a backing track into a singable key, nudge a sample, or disguise a voice without it sounding sped up. Larger shifts toward the ends can sound slightly artificial, so use the smallest that works. It reads almost any input (MP3, WAV, M4A, FLAC, Opus and more) and runs entirely on your device, so nothing is uploaded. Want to change speed and pitch together instead? Use the Speed Changer.
Frequently Asked Questions
How do I change the pitch of an audio file?
Load your audio file, drag the slider to how many semitones you want to shift — positive to raise the pitch, negative to lower it — and press Shift pitch. The tool re-pitches the audio and gives you the result as an MP3 to download. Everything runs on your device, so nothing is uploaded. Twelve semitones is one octave, so +12 raises the audio a full octave and -12 lowers it a full octave.
Does changing the pitch change the speed?
No — changing the pitch does not change the speed. This tool shifts the pitch while keeping the tempo and duration the same, so a higher-pitched version plays for exactly as long as the original and at the same pace — only the pitch moves. That is different from simply playing a recording faster, which raises the pitch and shortens it together. Here the two are separated, which is what you want for transposing music or changing a voice without it sounding sped up.
What is a semitone?
A semitone is the smallest step in Western music — the distance from one key to the next on a piano, black or white. Twelve semitones make an octave, which doubles the frequency. So +7 semitones raises the audio by a perfect fifth, +12 by a full octave, and -3 lowers it by a minor third. If you just want a subtle change, one or two semitones is enough; for transposing a song to another key, pick the number of semitones between the keys.
Is my audio uploaded, and what format do I get back?
Nothing is uploaded — the pitch shift runs entirely in your browser with ffmpeg compiled to WebAssembly, and the engine downloads once (about 10 MB) then later runs start instantly. The result is saved as an MP3 at the bitrate you choose, which plays everywhere; if you need another format, run the MP3 through the Audio Converter. Your original file and the pitch-shifted result never leave your device, so it works offline after that first load and there is nothing to sign up for.
Will large pitch shifts sound artificial?
Small shifts of a few semitones sound clean and natural. Larger shifts toward the -12 or +12 ends stretch the audio further and can introduce a slightly artificial or watery quality, especially on complex music, because the pitch is being moved a long way while the tempo is held fixed. For the most natural result, use the smallest shift that gets you where you want, and for transposing music, shifts up to about five to seven semitones usually hold up well.