Change audio speed and pitch
Your files are processed on your device. We never upload them.
Audio is read and written with Mediabunny. MP3 files are made with LAME and FLAC files with libFLAC; browsers without their own AAC encoder use FFmpeg's. Apple Lossless files follow Apple's ALAC code.
How to change audio speed and pitch
- 01A ▸Choose an audio file, or drop it on the page.
- 02A ▸Pick a speed, from 0.5× to 2×, or type one from 0.25× to 4×.
- 03A ▸Move the pitch if you like, or tick "like a record" to let it follow the speed.
- 04A ▸Select Change speed, listen to the result, and download it.
Questions
Does the voice sound like a chipmunk when sped up?
No, unless you want it to. The pitch is kept by default, so speech sped up to 1.25× or 1.5× still sounds natural. Tick "like a record" for the classic sped-up or slowed-down sound.
Can I change the pitch without changing the speed?
Yes. Leave the speed at 1× and move the pitch by up to 12 semitones (an octave) up or down, for example to sing along in another key.
Are my files uploaded?
No. Your files are processed on your device. We never upload them.
How does it keep the pitch?
It cuts the sound into short overlapping pieces and lays them closer together or further apart, lining each piece up with the last (a method called WSOLA). Very large changes, such as 0.25× or 4×, can sound a little rough.
How long does it take?
A few seconds for a song on a computer. Keeping the pitch takes more work than a plain speed change, so long files take longer on phones.