

The macro requires that you have Zotero open and in the duplicate window, with the right panel where the "merge" button is visible. You do have to set up a few things before it works in your computer. The macro simply clicks on each duplicate and presses the merge button. If you want to take it for a spin without committing, I believe KM has a trial. To solve this (somewhat) I wrote a short ( ) macro to do this. It's not completely automatic and can fail to complete for a few reasons, but it did help me go through a lot of duplicates. As many have mentioned, Zotero doesn't have a way to merge a large number of duplicates, so the user is forced to manually press "merge" on individual duplicates. The process involved migrating many individual collections to Zotero, which resulted in many (hundreds? thousands?) of duplicated in the zotero library. I recently had to migrate a large (>9k) items from Papers 3 to Zotero.
