As the name suggests, MP3 Speed Changer enables you to adjust the speed of audio tracks with the MP3 format. It supports other sound extensions as well, such as WMA, OGG, APE and FLAC.

The utility features a batch processing mode and a clean and straightforward interface to help you carry out tasks smoothly. Its GUI is based on a single window where you can load audio tracks using either the file browser or drag-and-drop support.

The list displays the name, length and status for each item. By moving two sliders on the bottom part of the panel, you can adjust the tempo and speech levels, or just input the values in the dedicated boxes directly.

As for the location of the new items, these can be either saved to the same directory as the source tracks, or to a custom one. Other options of MP3 Speed Changer let you preview songs in a built-in audio player, remove files from the list, as well as modify the sound quality, output file name pattern (e.g. append tempo information) and preview length (in seconds).

MP3 Speed Changer has a minimum impact on the system resources, running on a low amount of CPU and RAM. It is very responsive to commands and carries out a task rapidly while preserving quality audio stream. No error dialogs have been shown throughout our evaluation and the utility did not hang or crash. Thanks to its intuitive layout and overall simplicity, first-time users should quickly figure out how to work with MP3 Speed Changer.