Does Spotify work without any internet connection?

Yes, I personally recommend you to get one TunePat Spotify Music Converter. It's the top priority to convert Spotify to a common format, like MP3, AAC, and others. And it's quite simple to use. No need to install any other extra app, including the Spotify app.

The converter successfully saves my favorite playlist into MP3 and transfer to my MP3 player. The artist and title I want are all kept well.