Zotero for Researchers: Reference and Citation Management Guide

Zotero is a free, open-source reference manager built and maintained by the nonprofit Corporation for Digital Scholarship. For researchers, its main job is collecting sources while reading and searching, organizing them by project, and inserting correctly formatted in-text citations and bibliographies into a manuscript, proposal, or dissertation as it’s drafted. This guide walks through setting Zotero up and using it for the tasks that come up constantly in research and proposal-writing work: building a project-specific library of literature, citing while drafting in Word, Google Docs, or LibreOffice, annotating PDFs, and sharing a working bibliography with co-investigators through a group library. For a side-by-side comparison of Zotero against EndNote, Mendeley, RefWorks, and Paperpile on cost, institutional licensing, and feature support, see Reference Management Software Comparison; this guide instead goes deep on Zotero specifically.

Installing and setting up Zotero

Zotero has three parts, all free: the desktop application (Windows, macOS, Linux), the Zotero Connector browser extension (Chrome, Firefox, Safari, Edge), and an optional zotero.org account used for syncing. A typical setup sequence:

• Install the desktop app from zotero.org. This is where the working library lives and where collections, tags, notes, and PDFs are managed day to day.
• Install the Zotero Connector for whichever browser is used for literature searching. The connector detects bibliographic metadata on a page — a journal article, a database record, a Google Scholar or PubMed result, an institutional repository entry — and saves it (plus the PDF, where accessible) into the Zotero library with one click.
• Create a zotero.org account and enable syncing. Library data (item metadata, notes, collection structure) syncs through Zotero’s servers at no storage cost; attached files (PDFs and other documents) sync against a separate storage allotment — 300 MB free, with paid tiers at 2 GB for $20/year, 6 GB for $60/year, or unlimited storage for $120/year. Syncing is what lets the same library appear identically across a desktop, a laptop, and the Zotero mobile apps.
• Install a word-processor plugin for Microsoft Word, LibreOffice/OpenOffice, or Google Docs — covered in more detail below — so citations can be inserted directly while drafting rather than copy-pasted after the fact.

Organizing a literature library by project

Once references start accumulating, structure matters more than volume. Zotero’s two organizing tools are collections and tags, and they’re designed to be used together rather than as alternatives:

• Collections function like folders, but an item can belong to multiple collections at once — a single paper can sit in both a “Background” collection for a grant proposal’s significance section and a broader “Methods literature” collection reused across projects, without duplicating the underlying record. For a proposal with several aims or a manuscript with several sections, creating one collection per aim or section (and subcollections within them) keeps the reference pool for each part of the document separated while the full library search still spans everything.
• Tags are user-defined labels — useful for cross-cutting categories that don’t map cleanly onto a folder structure, such as “needs full-text,” “cite in intro,” or a co-investigator’s initials to flag who requested a source be added. Up to six frequently used tags can be color-coded for quick visual scanning and assigned keyboard shortcuts.
• Saved searches behave like a standing filter (for example, everything tagged a certain way within a date range) that updates automatically as matching items are added, rather than a one-time search result.

This structure is what makes Zotero practical for proposal writing specifically: a researcher assembling a multi-aim grant application can keep the literature underpinning each aim in its own collection, pull a properly formatted reference list for just that aim’s collection, and still search or cite across the whole library when a source is relevant to more than one section.

Capturing references

Zotero supports several ways to add items to a library, and most research workflows end up using a mix of all of them:

• Browser capture via the Zotero Connector — the primary method while searching a database, Google Scholar, or a journal site. The connector reads the page’s metadata and, for a single article, saves title, authors, journal, year, DOI, and (where access permits) the PDF in one click; for a search-results or database listing page, it can capture multiple items at once.
• Identifier lookup — adding an item directly by DOI, ISBN, PubMed ID, or arXiv ID, which Zotero resolves against the relevant metadata source without needing to visit the original page.
• PDF import — dragging a PDF already on disk into Zotero, which attempts to retrieve its metadata automatically from the file itself.
• RSS feed subscriptions — following a journal’s table-of-contents feed or a saved-search feed so new items appear in Zotero as they’re published, useful for staying current on a proposal’s or paper’s specific subfield without a separate alerting tool.
• Manual entry — for sources with no clean metadata trail, such as a technical report, dataset, or personal communication.

Zotero also maintains a Duplicate Items view that groups records it detects as likely duplicates (for example, the same paper captured twice from different databases) so they can be merged into one entry, which matters for a shared or long-running library where more than one person is adding sources.

Reading and annotating PDFs

Zotero includes a built-in PDF reader with highlighting, underlining, sticky notes, and free-form drawing; annotations made in the reader are stored with the library item and can be extracted into a standalone note that pulls together all of a paper’s highlights and comments in one place. For a literature review or a proposal’s background section, this means the annotation work (marking a paper’s key claim, flagging a relevant statistic, noting where a study’s methodology matches or diverges from the one being proposed) lives attached to the reference itself, rather than in a separate set of files or a paper notebook that has to be cross-referenced back to the source later.

Citing while writing: Word, Google Docs, and LibreOffice

Zotero’s word-processor integration is one of its more distinctive features among reference managers: it has an official, actively maintained plugin for Microsoft Word, LibreOffice/OpenOffice, and Google Docs — Google Docs support in particular is not universal across reference managers (Mendeley Cite and EndNote’s Cite While You Write, for comparison, are Word-only). In practice, the plugin adds an “Add/Edit Citation” and “Add/Edit Bibliography” command to the document, which:

• Opens a citation search box where typing an author name, title word, or year finds the matching item in the Zotero library, without leaving the document.
• Inserts a correctly formatted in-text citation (and, for note-based styles, a footnote) in whatever citation style is currently selected for the document.
• Builds and continuously updates a bibliography or reference list at the point in the document where it’s inserted, adding new entries and re-sorting automatically as more citations are added.
• Allows switching the entire document’s citation style after the fact — from, say, APA to a specific journal’s required style, or to a funder’s proposal-formatting requirements — with one command that reformats every existing citation and the bibliography together, rather than requiring a manual reformat.

For proposal writing specifically, this matters most in two ways: a narrative section’s citations can be drafted and cited without knowing yet which of several target funders’ preferred style will apply, since restyling later is one command; and because Zotero’s underlying citation-style system is the open Citation Style Language (CSL) with a large public style repository, most funder- and journal-specific formats already exist as ready-to-use styles rather than needing to be built from scratch. See Citation Styles and Referencing Formats for more on how these style libraries map onto specific journal and funder requirements.

Group libraries for co-investigators and multi-author teams

A group library is Zotero’s mechanism for sharing a working bibliography with collaborators — directly relevant to a multi-PI grant proposal, a multi-author manuscript, or a lab’s shared reading list. Groups are created either from the desktop app (File → New Library → New Group) or from the groups page on zotero.org, and come in three types:

• Private — visible only to members and anyone specifically invited; not discoverable in search or public profiles. This is the typical choice for an in-progress proposal or unpublished manuscript’s shared reference list.
• Public, closed membership — the group’s existence and page are visible, but joining requires an invitation or an approved request.
• Public, open membership — anyone can join immediately; open public groups do not support file sharing (attached PDFs), which makes them unsuitable for a group where collaborators need shared full-text access.

Within a group, members hold one of three roles — member, admin, or owner — with admins able to manage privacy settings and other members’ roles, and owners additionally able to delete the group or transfer ownership. Library-editing and file-access permissions can be restricted to admins only or opened to all members, which is worth setting deliberately for a proposal team: a group where every co-investigator can add and edit references directly avoids the back-and-forth of emailing PDF lists, but it also means one member’s mis-tagged or duplicate entry is visible to everyone until cleaned up. Group file storage draws on the group owner’s individual storage plan rather than requiring each member to have their own paid subscription, so one member (often the PI or a designated lab manager) can cover storage for the whole team.

For a multi-author submission, a practical pattern is a single group library for the paper or proposal, organized with the same collection-per-section structure described above, with each co-author capturing sources directly into the shared library as they draft their portion — keeping one authoritative, deduplicated reference pool instead of merging separate personal libraries at the end.

Zotero in a proposal-writing workflow

Putting the pieces above together, a typical proposal-writing use of Zotero looks like: create a group library for the proposal (or a project-specific collection within a personal library, for a single-PI application); build out collections mirroring the proposal’s structure (significance, innovation, approach, preliminary studies); capture literature via the browser connector while searching databases and via RSS feeds for ongoing alerts on the topic; annotate key papers directly in Zotero’s PDF reader while drafting the narrative; cite directly into the draft using the Word or Google Docs plugin as each section is written; and, close to submission, confirm the citation style matches the specific funder’s requirements (restyling in one step if it doesn’t) before exporting or finalizing the reference list. See How to Write a Grant Proposal and Components of a Grant Proposal for how a references or bibliography section fits into the larger proposal structure, and How to Write a Literature Review for a Research Paper for how the same collection-and-annotation workflow applies to a manuscript’s literature review rather than a proposal’s background section.

Frequently asked questions

Is Zotero really free for researchers, with no paid tier required?

The Zotero application, browser connector, and syncing of library metadata are all free with no paid tier. The only cost is optional cloud storage for attached files beyond the free 300 MB allotment, priced at $20/year for 2 GB, $60/year for 6 GB, or $120/year for unlimited storage. A researcher who keeps PDFs stored locally rather than synced to Zotero’s servers, or who stays under 300 MB of synced attachments, can use Zotero indefinitely without paying anything.

Does Zotero work with Google Docs?

Yes. Zotero has an official, natively maintained Google Docs plugin in addition to its Word and LibreOffice/OpenOffice plugins, which is not the case for every reference manager — Mendeley Cite and EndNote’s Cite While You Write, for example, officially support Microsoft Word only.

Can multiple co-investigators or co-authors share one Zotero library?

Yes, through a Zotero group library. A private group keeps the shared library invisible to anyone outside the group, and file (PDF) sharing is supported for private and closed public groups but not for open public groups. Group storage draws on the group owner’s storage plan, so members don’t each need a separate paid account.

Can citations be reformatted to a different style after a proposal or manuscript is already drafted?

Yes. Because Zotero tracks citations as live links to library items rather than static text, switching the document’s citation style through the Word, LibreOffice, or Google Docs plugin reformats every in-text citation and the bibliography together in one step, rather than requiring a manual rewrite.

How does Zotero compare to EndNote, Mendeley, RefWorks, and Paperpile?

Each has a different cost model, institutional dependency, and integration profile — see Reference Management Software Comparison: Zotero, EndNote, Mendeley, RefWorks & Paperpile for a full side-by-side comparison. In short, Zotero’s main distinguishing points are that it’s free and open-source with no institutional license dependency, and that it’s one of only a few reference managers with official native Google Docs support.

Can an existing EndNote or Mendeley library be moved into Zotero?

Generally yes. Zotero imports and exports standard bibliographic formats including RIS, BibTeX, and EndNote XML, which covers migration from most other reference managers, though some fields or attached files can require manual cleanup depending on the specific export path used.

See also Citation Management with AI Writing Tools for how AI-assisted drafting interacts with a reference manager’s accuracy, and Manuscript Submission Process: A Step-by-Step Guide for where a finalized reference list fits into journal submission. This guide focuses specifically on Zotero’s setup and researcher/proposal-writing workflow; it does not recommend Zotero over any other reference manager.