Audio editing · 6 min read
Slow 120 BPM to 90 BPM without changing the key
Calculate playback speed and semitone changes, prepare a practice excerpt, and verify the processed WAV before using it.
Read the storyTUNENOODLE / Free · runs in your browser
Audio speed & pitch changer
Slow down without changing key, or transpose without changing tempo. Preview and export your audio privately in your browser.
In your browser · no upload
Change speed and pitch independently
Audio speed and pitch changes tempo and key separately in the browser: slow a song down while it keeps its key, or transpose it while the tempo stays put.
Examples & decisions
Read the companion story100 BPM · 4/4
Hear a slower practice tempo.
Listen at 100 BPM, then slow playback to 75 BPM and follow an individual part.
Playback speed
Original synthesized practice loop, 100 BPM. These are its source tracks, not an AI separation result. The browser keeps the pitch while slowing playback. Open the tool to process and export your own file.
| Goal | Speed / pitch | Expected change |
|---|---|---|
| 120 → 90 BPM | 0.75× / 0 semitones | 24 seconds becomes 32 seconds |
| 80 → 100 BPM | 1.25× / 0 semitones | 24 seconds becomes 19.2 seconds |
| D major → C major | 1× / −2 semitones | Same duration, one whole tone lower |
| Down one octave | 1× / −12 semitones | Same duration; vocal character may change |
Parameter / option
| Parameter / option | What it changes |
|---|---|
| Speed | Changes how fast the track plays without moving the key. |
| Pitch | Transposes the audio in semitones without changing the tempo. |
| Presets | Practice slows the track while the key stays the same; nightcore speeds it up and raises the pitch together. |
| Compare | Switches between the original and the processed result to check the change. |
| Export | Renders a WAV in the browser. The file is decoded on your device and is never uploaded. |
How to use it
- 1
Choose an audio file from your device.
- 2
Set the speed and pitch you want, and compare the result with the original.
- 3
Export the processed audio as WAV.
Good questions
No. Speed and pitch are separate controls, so slowing a track down leaves its key where it was.
Your next step
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Audio speed & pitch changer
In your browser · no upload