Speed up or slow down an audio file

With Change audio speed, podcasters, musicians and audio editors can prepare a track during an edit. Speed up or slow down an audio file, knowing exactly how the pitch moves.

Speed up or slow down an audio file, knowing exactly how the pitch moves. Use it free in your browser with no account required.

How to use

Select the audio file whose speed you want to change.
Enter the speed factor: a value above one speeds it up, while a value below one slows it down.
Run the speed change and listen to a short section to hear how the pitch moves.
Download the result if the new pace suits your purpose.
If the effect is too strong, try again with a factor closer to one.

Example

To make a spoken interview feel more energetic, increase the speed slightly and check whether the words remain clear. To study a technical explanation, slow it down instead, but listen for the lower pitch that comes with the change. Keep a note of the factor if you may need the same pace again.

Limits and formats

This tool does not separate speed from pitch, so faster or slower playback can change how voices and instruments sound.
A factor far from one may make speech hard to follow or distort music, so test short sections first.
Always compare the exported file with the source, because some recordings handle speed changes better than others.

Where processing happens

The speed change is calculated in your browser. The audio file is processed on your device, with no outside transfer and no account required.

Frequently asked questions

What does a speed factor above one do?

A factor above one plays the audio faster, so the file becomes shorter. A factor below one slows it down and makes it longer. In both cases, listen for the effect on pitch before keeping the result.

Can I speed up only one section of a recording?

No, this tool applies the chosen factor to the whole file. To change a single passage, trim that section first, adjust its speed separately, and then merge the parts back together.

Will changing speed reduce audio quality?

Heavy speed changes can add artefacts, especially to speech. The tool cannot restore detail that was never recorded, but a moderate adjustment often stays usable. Always listen to the final file before publishing.