Go to www.media-convert.com. Click on the "Choose File" button and select the file you want to convert.
Click on the drop-down menu next to "Input Format" and make sure that "Ogg Vorbis (.ogg)" is selected. Click on the drop down menu next to "Output Format and select "MPEG-1/2 Audio Layer 3 (.mp3)." You can also specify if you want to rename the file, add ID Tags and more under "Advanced Settings"
Click "OK." The file will upload to Media-Convert's servers. This can take some time depending on your Internet connection. After the uploading and conversion process is complete a link will appear. Click on that link to download an MP3 version of the OGG file you uploaded.
Download and install Free Audio Convert Wizard (see Resources). Launch the program after the program is installed.
Drag the OGG files you want to convert into the program window. You can add multiple files or just do one at a time. After you have added all the files you want click "Next."
Click "Select" and choose the directory you want the MP3 files to be saved to. Click "OK" once you choose a directory.
Click on the "To MP3" icon under "Convert To" and then click "Convert" to have the OGG files converted to MP3s.
Download and install Free MP3 WMA Converter (see Resources). Launch the program after installation is complete.
Drag the OGG files you want to convert into the main program window. Choose the folder you want to save the MP3 files to by clicking on the "..." icon next to "Output Path."
Select "MP3" in the drop down menu next to "Output Format." Click convert and the program will convert the OGG files to MP3s, saving them in the directory you specified.