In Zotero version 6, when you have a reference with an attached PDF, double click the PDF attachment or citation to open the PDF reader to:

• color code and highlight text
• add reading notes
• extract annotations in your citation style

Learn more.

In Mendeley, when you have a reference with an attached PDF, double click on the PDF icon or citation to open Mendeley's PDF Reader where you can:

• add reading notes
• color code and highlight text
• save edits to cloud storage.

Learn more.