Pitch Changer: Change Key Without Changing Speed
Free · No sign-up · Files never leave your device
What is a pitch changer?
A pitch changer raises or lowers how high a recording sounds, measured in semitones and cents, without making it play faster or slower. This one does it with SoundTouch, a time-stretching library. It changes the length of the audio and its playback rate by matching amounts, so the two cancel out. You can also change speed alone. Set the song's key and the page shows the key it ends up in.
How it works
Step 1
Your browser reads the song
The file is decoded by your browser's own audio engine. Nothing is uploaded.
Step 2
Set the pitch and speed
Move pitch from -12 to +12 semitones, fine tune by up to 100 cents either way, and set speed from 50% to 200%. Preview plays the first 30 seconds.
Step 3
Download the result
The whole file is processed in this tab and saved as MP3, WAV, FLAC or, in browsers that support it, OGG (Opus).
Questions
Is my song uploaded anywhere?
No. Your file is decoded, shifted and saved inside this browser tab. The only things that load after you pick a file are the pitch engine and, when you download, the encoder for the format you chose: small pieces of code that come to your device.
Does changing the pitch change the speed?
No. The pitch and the speed are set separately. With speed at 100%, the exported file has the same length as the original. Set a speed below or above 100% and the pitch stays where you put it.
What do semitones and cents mean?
A semitone is the step between two neighboring piano keys. Twelve semitones make an octave, which doubles the frequency. A cent is one hundredth of a semitone, useful for matching a song that is slightly out of tune with your instrument.
Which files work?
Any audio file your browser can play, usually MP3, WAV, M4A, FLAC and OGG. If your browser cannot read a file, the page says so; converting it to WAV or MP3 usually fixes that. Downloads come as MP3 (320, 192 or 128 kbps), 16-bit WAV, lossless 16-bit FLAC or, where the browser can encode it, OGG (Opus).
Will the shifted audio sound exactly like the original?
No. Shifting pitch without changing speed is done by stretching and re-joining short slices of audio, so large shifts can leave small artifacts, mostly on voices and sustained notes. Shifts of a few semitones sound the cleanest.
Privacy: what runs where
- Your audio is decoded, pitch-shifted and saved as an audio file in this browser tab. It is never uploaded.
- The pitch engine (soundtouchjs) loads from 12notez.com after you pick a file. Nothing about your file is stored on our servers.
- Only use audio you have the rights to. A shifted copy of someone else's recording is still their work.