Audio Speed Changer

Speed up or slow down audio without changing its pitch

Drop an audio file

Change playback speed without altering pitch

Max file size: 5000MB

What is this tool?

Speeds up or slows down an audio file without changing its pitch -- unlike simply playing a file faster (which raises pitch, the "chipmunk" effect), this keeps voices and music sounding natural at a different speed. Runs entirely in your browser -- the audio never leaves your device.

How to use it

Upload your audio file, choose a speed (0.5x to 2x), and download the result.

This works well up to about 2x or down to about 0.5x -- pushed further than that, audio can start to sound artifacted or robotic since the underlying technique has to stretch or compress the waveform more aggressively while trying to preserve pitch.