Does Spotify upload my local files to its servers ?

No. Local files that you have imported into Spotify are not uploaded from your computer.

You can share local music in the same way that you can with streaming music. However, the music will only be played if it can be matched with music that can be played by the other users that you shared with. That is, if the music is available as impoprted local music on their computer, or if it can be found in the Spotify streaming catalogue.


More questions in Library and Local Files: