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EndNote allows you to import a PDF or a folder of PDFs into your library with all the bibliographic information extracted automatically, under the condition that the PDFs have DOIs embedded. How to import a PDF? Here are the steps:
Open your EndNote library.
Under the File menu, choose Import.
If it is a single PDF, choose File; if it is a collection of PDFs placed in a folder, then choose Folder.
In the Import File or Import Folder popup window, retrieve the PDF file or folder and click OK.
Make sure the Import Option is PDF. You can choose Import All (can dedup later).
Clicking on the Import button, all the PDFs will be imported into EndNote.
Note: If the PDF file was scanned or it does not have a DOI assigned, then it will not be successfully imported. All it has will be an attachment to an empty record.