It's easy to use EndNote and Zotero together
and take advantage of the best features of each, or to share Zotero libraries
with colleagues using EndNote or vice versa. Both
programs can read and write a standard citation file format called RIS, which
means references can be converted back and forth with a few clicks.
PDFs and other attachments do not export between programs, however; only citation information.
Zotero to EndNote
save your Zotero library for importing into EndNote, click the Zotero button
that looks like a gear and choose "Export Library." Choose RIS as the file type
and pick a filename.
In EndNote, click "File" and then "Import." Click the "Choose File" button and
select the file you just exported from Zotero. Set Import Option to "Reference
Manager (RIS)" and click Import.
EndNote to Zotero
export your EndNote library for use in Zotero, click "File" and then "Export."
Set the output style
and save it as a text file.
In Zotero, click the button that looks like a gear and choose "Import." Just
double-click the file you exported from EndNote. The new references will be
added to a collection named "Imported" followed by the date and time.