Change speed and pitch in the browser
Keep pitch holds the key while the length changes, using overlap-add. Follow pitch lets the key move with the speed, like tape. Extra semitones shift the key on top of that.
Drop audio to change speed
Large speed changes take longer on the device.
MP3, WAV, M4A, OGG, OPUS, AAC, FLAC
100% is the original length. 50% is twice as long. 200% is half as long.
Semitones. Zero leaves the key from the speed mode unchanged.
Keep pitch separates length from key. Follow pitch links them.
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What does a speed and pitch changer do?
A speed and pitch changer makes audio play faster or slower and moves its musical key up or down. This one runs in your browser, so the file stays on your device. Speed runs from 50 percent to 200 percent, with 100 percent as the original, and pitch runs from minus 12 to plus 12 semitones. In Keep pitch mode the tool changes the length while holding the key, using an overlap-add stretch. In Follow pitch mode the key moves with the speed, like speeding up or slowing down a tape. Extra semitones shift the key on top of either mode. Keeping pitch works well for speech and moderate changes, but extreme settings can sound metallic, because this is not a studio time stretch. Preview the result, then save a 16-bit WAV or an MP3. It is free, with no account and no watermark.
How to use it
- Set speed Under 100% is slower. Over 100% is faster.
- Choose how pitch behaves Keep it steady, or let it follow the speed.
- Save Choose WAV for a full-quality file, or MP3 when you need a smaller one. Nothing is uploaded.
What to expect
Keeping pitch uses a simple overlap-add stretch. It is fine for speech and moderate music changes. Extreme settings can sound metallic. This is not a studio time-stretch.
FAQ
Can I change speed without changing key?
Yes. Leave the pitch behavior on Keep pitch and change the speed. The tool stretches the audio with an overlap-add method so the length changes while the key stays put. Speed runs from 50 to 200 percent. This works well for speech and moderate changes, but extreme settings can sound metallic, because it is not a studio time stretch.
What does pitch follows speed mean?
Follow pitch means the key moves with the speed, exactly like speeding up or slowing down a tape. Faster playback sounds higher and slower playback sounds lower. You can still add extra semitones on top. Choose it for a tape-style effect, and choose Keep pitch when you want a faster or slower file in the original key.
Is there a range limit?
Yes. Speed runs from 50 percent to 200 percent, where 100 percent is the original. Pitch runs from minus 12 to plus 12 semitones, which is one octave down or up. Both limits are fixed in the tool. For a stronger change you would need to process the result again, and extreme settings can sound metallic.