OS X 10.10 or later only. iTunes can only export a single playlist at a time (File > Library > Export Playlist...). This applet will export each selected plain, Smart, and Genius playlist as individual XML or M3U files to a user selected directory. Such files can be imported into iTunes again later or into other devices or apps. Not as fast as iTunes' own "Export Playlist..." command, but it does the job without the repetition required.
Also see Export Selected Tracks to XML.
Select some playlists, choose the file type, and click on "Export".
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