There are countless tools to convert MP3 files from many different formats on the Internet, but the quality of the MP3 files they create may have changed dramatically. However, if you have never done this, one of the barriers you will face is choosing the right software to do this. If you are looking to save memory by switching to another format (meaning a conversion does not retain the original quality), one of the most popular solutions is to convert to MP3 format.
If you have a bunch of WAV files on your computer, you will know how much hard disk space they occupy.