Free tool
Key & Tempo Shifter
Change a loop's key (in semitones) or its tempo (percentage) independently — pitch stays put when you stretch time, and length stays put when you transpose. Runs entirely in your browser; your audio never leaves your device. 100% free.
0 st
original key
100%
50% = half-time · 200% = double-time (pitch unchanged)
How to change the key or tempo of a loop
- Drop a loop or sample onto the tool — WAV, MP3 and other common formats work.
- Move the Pitch slider to transpose in semitones (±12), or the Tempo slider to stretch time (50–200%) — each works independently, so tempo changes never chipmunk your audio.
- Hit Render. Processing runs entirely on your device.
- Preview the result and download it as a WAV, ready for your DAW.
Frequently asked questions
How is this different from just speeding audio up?
Simple speed changes shift pitch and tempo together (the classic chipmunk effect). This tool uses time-stretching so you can transpose the key while keeping the length, or change the tempo while keeping the pitch.
How many semitones can I shift before it sounds bad?
Within ±3–4 semitones most material stays clean. Bigger shifts add audible artifacts — extreme stretches can be a creative effect, but for natural results keep moves small.
Is my audio uploaded anywhere?
No — decoding, stretching and rendering all happen in your browser. The file never leaves your device.
What key should I shift my sample to?
Match it to your project: find the sample’s current key with the key and BPM finder, then shift by the difference in semitones.