Online Tone Generator

Slow down or speed up your audio files, simple and free.

This free online time stretcher tool allows you to change the tempo of audio files (mp3 or wav format), without affecting the pitch. You can either slow down or speed up your audio file. To begin, click the "choose file" button to select the audio file from your computer that you would like to pitch shift.

Clicking the play button will then commence playback, and the tempo can be altered either by using the slider. Changing the tempo of an audio file is useful for a wide range of purposes. One example would be slowing down a song to help practice playing along with it.