Audio Speed Changer
Make an audio file play faster or slower right in your browser. Drop in an MP3, WAV, M4A, or other audio file, drag the slider from half speed to double speed, and download the result as a WAV. This works by resampling, like changing the playback rate of a tape, so the pitch shifts with the speed: faster audio sounds higher, slower audio sounds lower. The file never leaves your device.
How to change audio speed
- Drop an audio file in, or click to browse.
- Drag the speed slider from 0.5x (slower) to 2x (faster).
- Click Download to save the new WAV file.
Examples
Speed up a lecture
A 60 minute lecture recording at 1.5x
A 40 minute WAV that plays faster, with a slightly higher pitch
Slow down a song to learn it
A guitar riff at 0.5x
A WAV that plays at half speed, an octave lower, easier to follow
Frequently asked questions
Is my audio uploaded anywhere?
No. The file is decoded and processed entirely in your browser. Nothing is uploaded to any server, so it works offline once the page has loaded.
Does changing the speed also change the pitch?
Yes. This tool resamples the audio, like changing the playback rate of a tape, so speeding it up raises the pitch and slowing it down lowers it. It is not a pitch-preserving time stretch.
What speed range can I use?
The slider goes from 0.5x (half speed, double length) to 2x (double speed, half length). 1x leaves the audio unchanged.
What format is the download?
The result is a 16-bit PCM WAV file at the original sample rate. WAV is uncompressed and plays everywhere, so the sped-up or slowed-down audio keeps full quality.
What files can I load?
Anything your browser can decode: MP3, WAV, M4A, OGG, FLAC, and the audio track of many MP4 and WebM files. The output is always a WAV.
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