Open your Web browser. Navigate to the Online-Convert home page, and wait for the site to load.
Click the Select Target Format drop-down box in the Audio Converter box. Select Convert to MP3, and click Go. Online-Convert may load the next page automatically once you make your selection. On the next page, click the Browse button, and navigate to your WMA file. Click Open.
Click the drop-down menus in the Optional Settings section to change the audio bitrate, sampling rate and audio channels. You can also choose to trim or normalize the audio before converting the WMA file.
Click the Convert File button, and wait for Online-Convert to upload the WMA file to the server. Once it converts the WMA file to an MP3 format, click the Save As button in the pop-up box. Select a save location, and download the MP3 file to your computer. Once it finishes downloading, open the MP3 file in your preferred music player.