Pitch Changer
Drop in a file, set the change in semitones and cents, listen, and export a WAV that lasts exactly as long as the original. It runs in your browser, handles files up to 150 MB and 15 minutes, and nothing is sent anywhere.
Use audio you made or have permission to use. Nothing is sent anywhere, so we never hear or keep it.
Pitch set. Melodious can turn the finished track into a music video — See the music video maker
Seven worked examples
The first five cases run the tool's own engine on a generated 440 Hz tone, half a second long, and count the cycles in what comes out. The last shows how big the file is. Music is more complicated than a single tone, so these show that the arithmetic is right, not how a full mix will sound.
A 440 Hz tone up an octave
- Asked for: +12 semitones (ratio 2.0000)
- Expected: 880.0 Hz
- Measured in the output: 879.8 Hz
- Length: 22,050 frames in, 22,050 frames out
Up a fifth, 7 semitones
- Asked for: +7 semitones (ratio 1.4983)
- Expected: 659.3 Hz
- Measured in the output: 659.3 Hz
- Length: 22,050 frames in, 22,050 frames out
Down a fourth, 5 semitones
- Asked for: -5 semitones (ratio 0.7492)
- Expected: 329.6 Hz
- Measured in the output: 329.6 Hz
- Length: 22,050 frames in, 22,050 frames out
A quarter of a tone up: 1 semitone and 50 cents
- Asked for: +1.5 semitones (ratio 1.0905)
- Expected: 479.8 Hz
- Measured in the output: 479.9 Hz
- Length: 22,050 frames in, 22,050 frames out
Zero is refused, because it would change nothing
- Refused: A change of zero semitones would give the file back unchanged. Choose a number other than 0.
More than an octave is refused
- Refused: This tool changes pitch by up to 12 semitones (one octave) each way.
How big one minute of output is
- Stereo, 44,100 Hz: 10.1 MB a minute
- Stereo, 48,000 Hz: 11.0 MB a minute
- Mono, 44,100 Hz: 5.0 MB a minute
Frames are single time slices of the audio, one per sample at the file's rate. A tone has no formants and no drums, so it is the easiest thing to shift; listen to your own file with Play the result before you export.
How to change the pitch of an audio file
Drop an audio file onto the box, or choose one. The page decodes it and draws its waveform. Enter the change in semitones, or move the slider: positive numbers go higher, negative numbers go lower, and twelve is one octave. If the recording is slightly out of tune, add a few cents in the fine-tune box.
Press Play the result to hear the first thirty seconds processed exactly as the export will be. When it sounds right, press the export button. The readout above the buttons gives the length and size of the file before you export, and says plainly that the length does not change. The work takes a few seconds, with a progress figure and a Cancel button while it runs.
Changing the key to suit a voice or an instrument
The usual reason to change pitch is a key that does not fit. A backing track sits too high for a singer, a sample is in the wrong key for a project, a guitarist has tuned down and wants the track to match. The job is a count: find the key you have, decide the key you want, and enter the number of semitones between them.
The song key finder reads the key from a file, and the Camelot wheel shows which keys sit next to each other. Because a semitone is the same step everywhere, moving a track by seven semitones takes it up a fifth, and moving it by twelve takes it to the same key an octave away.
What the processing does, and where it shows
Changing pitch without changing length is two operations. The tool first changes the duration of the audio while leaving its pitch alone, which it does by cutting the sound into grains of about 46 milliseconds, spreading them out or squeezing them together, and nudging each grain by a few milliseconds so its waveform continues the one before. It then plays that audio back faster or slower, which moves the pitch and returns the length to what it was.
It is a good method, and a plain one, and it has known weak spots. A single instrument or a sparse mix shifts cleanly. A dense mix with strong drums can smear the hits a little, and a long shift on a voice changes its character, because the resonances of the voice move with the pitch. The notes under the box say when a change is large enough to listen for. The worked examples above prove the arithmetic on a clean tone; your own file is the real test.
Limits, stated up front
Pitch can move up to 12 semitones each way. The tool opens files up to 150 MB and 15 minutes and refuses to write a WAV over 100 MB, because your browser decodes the whole file into floating-point samples, which takes many times the size of an MP3, and builds the result in memory before it is saved. Past a limit the tool says what the size would have been and what would fit.
It handles mono and stereo, keeps the first two channels of anything larger, and writes a 16-bit WAV at the rate your browser decoded the file at, which is larger than the MP3 it came from. It does not change the tempo, fix a note that was sung out of tune, or tell you what key the file is in. Phones have less memory and are slower than computers, so keep files short there.
What to do with the shifted file
If you also need it faster or slower, the audio speed changer changes the speed without touching the pitch. To take only the part you need, the audio cutter keeps a section and fades its ends, and the volume booster sets the level.
To know the tempo of the shifted track, the BPM finder reads it from the file. Shifting pitch does not change it.
From a track in the right key to a finished video
A track in the right key is ready to go under a picture. For the wider route, the guide to making a music video for your song covers it end to end.
When the finished track should have scenes, a character and a story, the AI music video generator storyboards it and renders it to your audio. It is paid, from $19/month, and you see the cost before anything renders. The WAV you make here stays on your device unless you upload it yourself.
Frequently asked questions
How do I change the pitch of a song without changing its speed?
Drop the file onto the box, enter the number of semitones (a positive number goes higher, a negative number goes lower), press Play the result to hear the first thirty seconds, and press Change the pitch and export WAV. The exported file lasts exactly as long as the original, so it still lines up with anything it was cut to.
What is a semitone, and how many do I need?
A semitone is the smallest step on a piano, one key to the next, and twelve of them make an octave. To move a song from C major to D major is two semitones up. To sing a song a little lower, one to three semitones down is usual. A single semitone is easy to hear; half of one is a tuning adjustment.
What are cents for?
A cent is one hundredth of a semitone. Use cents when a recording is slightly out of tune with something else, for example a track that was recorded a little flat against a backing you cannot change. Ten to thirty cents is a typical correction. The fine-tune box adds to the semitones, so +2 and +50 cents is two and a half semitones up.
How do I change the key of a song to match my voice?
First find the key of the track, which the key finder on this site reads from a file. Decide which key sits comfortably in your range, count the semitones between the two, and enter that number. If the song is in A minor and you want G minor, that is two semitones down. Play the result and sing along before you export.
Why does a voice sound odd when I shift it a long way?
Shifting moves everything together, including the resonances that give a voice its character. Up a long way the voice sounds smaller and brighter; down a long way it sounds larger and darker. This tool does not preserve those resonances separately, so beyond about five semitones a vocal starts to sound like someone else. Instruments tolerate more.
How does it keep the length the same?
It works in two steps. First it stretches the audio in time without changing its pitch, by cutting it into short overlapping grains and laying them back at a different spacing, with each grain nudged to line up with the one before. Then it plays the stretched audio back faster or slower, which moves the pitch and brings the length back to the original.
Is it real time, and how long does it take?
It is not real time. The preview and the export both work through the file as fast as your device can, and a track of a few minutes usually takes a few seconds. A progress figure and a Cancel button show while it works. Very long files take proportionally longer, and a phone is slower than a computer.
How far can I shift, and how long a file can I use?
Up to 12 semitones, one octave, each way. It opens files up to 150 MB and 15 minutes and writes a WAV up to 100 MB, about 9.9 minutes of stereo at 44,100 Hz. Past a limit it refuses and tells you the size and what would fit.
Does the pitch changer upload my audio?
No. The file is read by your browser, processed by code running in your browser and saved back to your device. There is no upload step, no account and no engine to download, and the code that shifts the pitch contains no network call. Closing the tab clears it. The network tab of your browser's developer tools will show no request carrying your audio.
Can I change the pitch of a song I did not make?
Only with permission. Use audio you made or have permission to use. A pitch-shifted copy of a commercial recording is still a copy, and posting it can infringe the copyright even though it sounds different. The tool cannot tell whose audio a file holds, so the check is yours.
The key is right. The video is next
Attach the track and describe the look. An AI director storyboards it scene by scene and renders it to your audio. Plans from $19/month, and you see the cost before anything renders.
Start your videoMore tools: Music speed changer · Song key finder · Camelot wheel · BPM finder · Audio cutter · Volume booster