There are so many audio file sources available on the internet legally. For example, the LibroVox project hosts thousands of free audio books contributed by people from all over the world. I often download some of these audio books so I can listen to them when traveling by bus or train. I usually download these audio books to my desktop computer and then copy to my smartphone. Most of these audio books come in MP3 format, but sometimes they are in the WAV format which makes them large in size. In such situations, you can use the free Any Video Converter to convert these audio files into MP3 or MP4 formats (or some other format supported by your mobile device).
You can get the Any Audio Converter from the Any Software website. The download is a setup installer of around 13 megabytes in size. After the installation, you can run it from the Desktop shortcut or by searching it from the Search Charm.
Interface is pretty clean and easy to use. You can click on the Add Files button to add the source audio files. You can also drag-n-drop the audio files over the Any Audio Converter window. Next, you have to click on the Output Format and choose a target format that you want to convert the source files into. There are many different formats specific to various mobile devices like Apple devices, Sony devices, Microsoft mobile devices and other types of mobile phones.
You can choose different output formats for different source audio files. After this you can click on the big green Convert button to start the conversion. The conversion is fairly quick and for each individual file takes no more than one minute. The converted output files can be found in the folder shown near the bottom edge of the window (the path of which you can modify if required).
Conclusion: The Any Audio Converter is an excellent audio conversion tool. It is free and covers all sorts of audio files and formats that you can think of. It can let you choose the output formats compatible with many mobile platforms like Apple iOS, Windows Mobile, and Android.
You can download Any Audio Converter from http://www.anvsoft.com/any-audio-converter.html.