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Duplicates Merger for Zotero

by frangoud · github.com/frangoud/ZoteroDuplicatesMerger

Merges duplicates in two modes: smart merge for selected items, and bulk merge through the whole Duplicate Items pane without prompts.

Duplicates Merger for Zotero has Atlas grade A (recommended) because every code check came out low. It's a Zotero 6 plugin, so Zotero 7 and later can't load it. What to use instead. Last checked 6 Nov 2026.

Organising & tags
View source
Downloads a .xpi file (0.02 MB). In Zotero, open Tools → Plugins and install it from the file.
In useAn estimate of how many copies of Zotero have it: Zotero downloads each new version once for every copy that has the plugin, so we count the downloads of its most-downloaded recent release. Rounded. Plugins that update from outside GitHub count low.
40k
DownloadsAll-time downloads of its release files from GitHub, counting every update. Installs from elsewhere aren't counted.
46,823
ReleasesVersions published on GitHub. Everyone who has the plugin downloads each one again, which adds up in Downloads.
4
StarsPeople who starred the repository on GitHub: a rough measure of interest.
416
ContributorsPeople who have committed code to the repository.
2
LicenceThe licence the code is published under, as GitHub reports it.
MPL-2.0
A
Atlas gradeRecommended
because every code check came out low
Applies to v1.1.5, released 3 Aug 2022Code checked · not yet tested in a live Zotero
Legacy plugin for Zotero 6 onlyUses the old plugin format. Zotero 7 and later can't load it.
What we found in the codeSets the gradeThe worst finding in these three areas sets the grade.
Code transparencyReadable code; not yet checked against the published sourceThe developer uploaded the release file from the frangoud account. We haven't yet checked whether this file matches the public source code.UnknownWe couldn't check this yet.
Updates
Doesn't update automatically: the update address isn't an update file
Where your data goesNo web requests foundLowLow concern: normal for plugins that do this job. Listed so you know.
No further detail for this area yet.
Powerful capabilitiesNo powerful capabilities foundLowLow concern: normal for plugins that do this job. Listed so you know.
No further detail for this area yet.
Before you installShown, not gradedFacts to help you decide. They don't change the grade.
Works withZotero 6 only (legacy plugin)Doesn't work with the current Zotero (10)MediumMedium concern: worth reading before you install. One medium finding makes the grade B.
Zotero 6 ✓ worksZotero 9 ✗ doesn't workZotero 10 ✗ doesn't workZotero 11 beta ✗ doesn't work
What you'll needNothing extra detectedDetected automatically from its code
No further detail for this area yet.
MaintenanceDormant · last release 3 Aug 20222 contributors
No further detail for this area yet.
LanguagesDocumentation in EnglishInterface: English
No further detail for this area yet.
We report what we found in the code. Open any area for the evidence.How we gradeReport a problem

What it does

Written by AI from the README

Merges duplicates in two modes: smart merge for selected items, and bulk merge through the whole Duplicate Items pane without prompts. You choose whether the newest or oldest copy is the master and how to handle differing item types.

Zotero's duplicate merging is one pair at a time. The author warns bulk merge can freeze on lists of about 5,000 or more items, and the plugin is legacy.

What you'll need

Detected automatically

We haven't detected any setup requirements. That isn't the same as none: check the developer's README.

Where your data goes

We found: no web requests found.

Other plugins that do this

Matched on what they do

For the same job, work with Zotero 10 and graded A or better. Closest match first.

  • A
    ZotDupe

    Finds likely duplicates that exact matching misses, such as preprints and published versions, translations, different item types and incomplete records.

    Matches “duplicate items across types” · 88 downloads · Active · Zotero 7–10, 11 beta
    Works with Zotero 10Actively maintained
  • A+
    Zoplicate

    Catches duplicates the moment you import and asks whether to keep the new copy, the old one or both, then merges without losing attachments or notes.

    Matches “merge duplicates automatically” · 1.02M downloads · Active · Zotero 9–10
    Works with Zotero 10Actively maintained
Compare all 3 side by side
How we pick these

By how closely what they do matches this plugin, using descriptions and the phrases people search with. Copies and forks of this plugin are listed under Forks and copies instead. No plugin pays to appear here.

Forks and copies

No forks listed.

The developer's response

The developer hasn't responded. Developers can reply here, and their reply sits next to our findings.I'm the developer

Ratings and reviews

What people who use it say. This is separate from the grade, which is what the code does, and never changes it.

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Install Duplicates Merger for Zotero
ARecommended
  1. 1Download the plugin fileDownload v1.1.5.xpi · 0.02 MB
  2. 2In Zotero, open Tools › Plugins
  3. 3Click the gear, choose Install Plugin From File… and pick the file
Step-by-step guide with pictures