What the best command-line tool that runs on Windows to speed up MP3s? A tool that I give an mp3 (or wav) and that returns an mp3.

  • Do you want to play or edit+save them via command-line?
    – unor
    Sep 13, 2014 at 13:28
  • @unor: Edit+save
    – Christian
    Sep 13, 2014 at 13:55

2 Answers 2


You can use SoX (Sound eXchange):

  • free
  • open source
  • Windows / Linux / Mac
  • CLI
  • can speed up MP3s: e.g. sox --show-progress in.mp3 out.mp3 speed 2. You may want to change the pitch as well, e.g. sox --show-progress in.mp3 out.mp3 speed 2 pitch -200. You can otherwise use stretch to change the rate of playback of an audio sample while preserving the pitch. For example to x2 speed a file: sox --show-progress in.mp3 out.mp3 stretch 0.5

FYI: SoX manual.

  • I would prefer if the tool would automatically change the pitch to the correct value as well. Otherwise how do I know the correct pitch adjustment?
    – Christian
    Sep 14, 2014 at 16:14
  • @Christian Answer edited, example with stretch added. Sep 14, 2014 at 17:06

You can use Paulstretch (a.k.a. Paul's Extreme Sound Stretch):

  • free
  • Open-Source (version 2 of the General Public License)
  • source code for Linux or the Windows binaries available
  • CPP and Python versions available. The Python version provides a CLI.

Description from the website:

  • It produces high quality extreme sound stretching. While most sound stretching software sounds bad when trying to stretch the sounds a lot, this one is optimized for extreme sound stretching. So, the stretch amount is unlimited.
  • You can play the stretched sound in real-time (including the possibility to "freeze" the sound) or you can render the whole sound or a part of it to audio files
  • It has many post-processing effects, like: filters, pitch/frequency shifters
  • Support for WAV, OGG VORBIS files and MP3 files

enter image description here

enter image description here

enter image description here

enter image description here

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.