Online Music Speed Changer

Use this tool to change the speed (tempo) of music without changing the pitch. This tool is useful for music training, transcription, instrument learning (piano, guitar, flute, etc.), or just for music slow down or speed up. If you are logged in you can opt-in to get notified by email once the conversion is finished.

Source file

You can either enter a remote URL (e.g. a location where the source file is located) or a local file from your device. If both, an URL and a local file are selected then one of them is ignored.

Only check this if the link points to a video portal and not directly to an audio or video file. Note: YouTube is not supported.
We support import from many video portals including Vimeo, Dailymotion, SoundCloud, BlipTV, Arte, Ard, 3Sat,, Flickr, Instagram, Facebook, Metacafe, MTV, Myspace,, NBA, NBC, NHL, Rottentomatoes, Sina, Slideshare, Space, Spiegel, Tumblr, Vice, ustream, Vevo, Weibo, Yahoo, ZDF, and others.

Email notifications

Please login to display email notification settings.

How to change the audio speed of a MP3 file?

  1. Choose the MP3 file for which you want to change the speed.
  2. Select the playback speed.
  3. Select the audio format (MP3, WAV, M4A) and audio quality (optional).
  4. Click on "Start conversion" to change the speed.
  5. Download your converted file.


The speed change is given in percent (%). This means, a value of "-50" plays back the audio at half the speed. A value of 100 means that the music playback speed is doubled.

Two different algorithms are provided - a time-based and a frequency-based (FFT). Generally Algorithm 1 yields better results, but depending on the input music also Algorithm 2 can sound better.