Import / Export Notes

Your notes from iPhone, and iPad automatically sync back to your Mac using iCloud Drive. Just make sure you sign in using the same iCloud account and iCloud Drive for Letterspace is turning on in System Preferences.

You can find all your notes in here:

Finder → iCloud Drive → Letterspace → Inbox
Finder → iCloud Drive → Letterspace → Archive

While Letterspace create a new note in .txt format, you can put any text files using any extension as you see fit.

iCloud Drive for Windows

Letterspace also sync with Windows PC (Windows 7 or 8 required). Thanks to iCloud for Windows.
Set up iCloud for Windows PC