I have around 300 html files which I want to import into OneNote 2013, each as a single note. How do I do it?
Try HTML importer .
Another link worth reading:
Although it is written for 2003, 2007 and 2010 it should work with 2013. At the very least its worth a look.
Found the same thing as Hovesep wrote http://www.onenotegem.com/2/post/2013/07/onenote-import-evernote.html
OneNote Batch 220.127.116.11 it is shareware perhaps there is a trial mode if interested?