Audio Speed and Pitch Changer.
Changes pitch and tempo of the song by adjusting musical key and BPM sliders. Slow down (or speed up!) any track to match your desired pace.
Click to choose a song, or drag & drop it here
Your audio is processed locally and never uploaded to a server.
MP3WAVFLACOGGM4A
No file handy?
Private by design — processing runs 100% on your device.
Preparing your track
—
Decoding audio…
0%
Detecting key and BPM automatically…
Detected tempo
— BPM
new tempo: —
Detected key
—
new key: —
0:00.0 / 0:00
No region selected
Drag on the waveform to set a loop region · click to seek
Tip: press Space to play/pause · the key slider keeps the tempo, the tempo slider keeps the key · export renders exactly what you hear.
How it works
Key and tempo, decoupled
Auto detection
Your song's key and BPM are detected automatically as it loads — so the sliders start from musical, meaningful values.
Slide to taste
The tempo slider changes speed while a granular engine holds the pitch. The key slider transposes without touching the pace. Prefer tape-style? Tick the vinyl option.
Loop, practice, export
Slow down that vocal or instrumental to learn it, or pitch it into your DJ set — then export the result as a WAV file.