Change Speed makes a track play faster or slower without altering its pitch, thanks to ffmpeg's atempo filter. Speed up a lecture, slow down a track to learn it, or nudge timing to fit a video — all done privately in your browser.
Drop your file in and play it to hear the original speed.
Use the slider or a preset from 0.5× to 2× to speed up or slow down.
Export to render the audio at its new speed.
No — pitch is preserved, so faster audio doesn't sound high-pitched or 'chipmunky'.
From half speed to several times faster; extreme changes are chained internally to stay clean.
Yes — slowing speech down without pitch change makes it much easier to follow.
No. This tool runs entirely in your browser — your file is processed on your own device and never leaves it. The only network request is an anonymous usage counter.