Which reference manager should you trust with three years of thesis citations? Zotero, Mendeley and EndNote are the three reference managers most universities support, and all three capture sources, store PDFs and insert citations and a bibliography into Word. The differences show up later: when your free storage fills, when a coauthor uses another tool, or when a product line is retired. This comparison covers eight points that matter for a thesis, based on the vendors’ and university libraries’ current pages, and ends with a decision table.
This article is part of our guide How to Write a Master’s Thesis by the Mastermind PhD team and relates to our Thesis & Research Formatting service. Sources last checked: November 2026.
What is a reference manager? A reference manager is software that stores bibliographic records (and often the PDFs), organizes them in folders or tags, and connects to a word processor so that citations and the reference list are generated in a chosen style such as APA, Harvard or IEEE, and update automatically when you edit the text or change the style.
What are the three reference managers in brief?
- Zotero is free, open-source software maintained by a non-profit organization, with desktop apps for Windows, macOS and Linux, a browser connector, and plugins for Word, LibreOffice and Google Docs.
- Mendeley is owned by Elsevier. Its current app is Mendeley Reference Manager, with the Mendeley Cite add-in for Word. The older Mendeley Desktop is no longer developed: Oxford’s Bodleian Libraries describe it as receiving “essential maintenance support” only.
- EndNote is a commercial product from Clarivate. The current desktop release is EndNote 2025, sold as individual, student and institutional licenses, with a free trial; many universities provide it through a site license.
How do the costs and storage compare?
Cost is often the deciding factor for a self-funded student, and the three reference managers handle it differently.
| Point | Zotero | Mendeley | EndNote |
|---|---|---|---|
| Software price | Free | Free | Paid license (free trial; often provided by universities) |
| Free cloud storage for files | 300 MB | 2 GB | Cloud storage included with the license (EndNote 2025 is marketed with unlimited storage) |
| Paid storage | 2 GB, 6 GB or unlimited per year | Larger paid plans | Tied to the license term |
| Unlimited references | Yes (only file storage is capped) | Yes | Yes |
Zotero’s 300 MB fills quickly once you attach PDFs, but you can keep files locally and sync only the metadata, or pay for a storage plan (the current prices are on Zotero’s storage page). Mendeley’s 2 GB is generous for most master’s theses.
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Which one works best with Word?
All three reference managers insert live citations through a Word plugin, and all three let you change the style in one step.
- Zotero installs plugins for Word, LibreOffice and Google Docs automatically. The toolbar offers Add/Edit Citation, Add/Edit Bibliography, Refresh and Document Preferences, where you switch the style.
- Mendeley Cite works in Word, including Word on the web. The older Desktop citation plugin also supported LibreOffice.
- EndNote has Cite While You Write for Word and works with Google Docs, and offers the deepest control over editing output styles.
One practical warning applies to all three: never edit a generated citation by hand. The next refresh will overwrite your change, or the citation will drift out of sync with the library.
How many citation styles do they support?
Two of the reference managers, Zotero and Mendeley, use the Citation Style Language (CSL) and give access to the same repository of over 10,000 styles, which covers almost every journal and university variant. EndNote uses its own style format and ships with several thousand styles, and its style editor is the most complete of the three for building a custom department style. If your faculty has a house style, check first whether a CSL file exists; a librarian may already have made one.
How do they handle collaboration?
| Need | Zotero | Mendeley | EndNote |
|---|---|---|---|
| Shared library with a supervisor or team | Group libraries, free for references; shared files count toward the owner’s storage | Private groups | Shared libraries through EndNote’s online sync |
| Coauthors using a different tool | Imports and exports RIS and BibTeX | Same | Same |
| LaTeX users | Strong, especially with the Better BibTeX add-on | Exports BibTeX | Exports BibTeX |
If your supervisor or research group already works in one of these reference managers, that is usually the strongest argument for choosing it.
What about long-term risk and data ownership?
A PhD can last four years or more, so before committing to one of the reference managers, ask what happens to your library if the product changes. Mendeley users experienced this when Mendeley Desktop stopped being developed and users were moved to Mendeley Reference Manager. Zotero stores your library in a local database on your computer and is open source, which makes exporting straightforward. EndNote libraries are local files too, but you need a valid license to keep using the full desktop features after you graduate. Whatever you choose, export your library to RIS or BibTeX every few months and keep that file with your thesis backups.
How do the three reference managers compare on eight points?
| Point | Zotero | Mendeley | EndNote |
|---|---|---|---|
| 1. Cost | Free | Free | Paid |
| 2. Free file storage | 300 MB | 2 GB | With license |
| 3. Word integration | Yes, plus LibreOffice and Google Docs | Yes (Mendeley Cite) | Yes, plus Google Docs |
| 4. Styles | CSL, 10,000+ | CSL, 10,000+ | Own format, large set and full editor |
| 5. Web capture | Very strong browser connector | Web importer | Capture through browser tools |
| 6. PDF reading and annotation | Built-in reader | Built-in reader | Built-in reader |
| 7. Collaboration | Group libraries | Private groups | Shared libraries |
| 8. Long-term access | Open source, local data | Vendor-managed product | Depends on license |
How do you switch between reference managers without losing citations?
Switching the library is easy; switching an existing Word document is the risky part. Export your library as RIS (or use Zotero’s built-in Mendeley import, which reads the Mendeley library directly), then check a sample of records for missing DOIs, page ranges and author names. Citations already inserted with one plugin are not recognized by another, so the safest moment to change tools is before you start writing chapters. If you must switch mid-thesis, keep a copy of the document, convert citations chapter by chapter, and compare the bibliography against the old version before you delete anything.
Which one should you choose?
- Choose Zotero if you want a free, open tool, work across Word, LibreOffice or Google Docs, use LaTeX, or care about owning your data.
- Choose Mendeley if you need more free file storage, read and annotate a lot of PDFs, or your group already shares a Mendeley library.
- Choose EndNote if your university provides a license, your department uses a custom style that needs editing, or your supervisor manages a large shared EndNote library.
Our step-by-step guide to Zotero for thesis writing covers setup through the final bibliography if you choose the free route.
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Frequently asked questions
Is Zotero better than Mendeley for a thesis?
Neither is better in every case. Zotero is open source, keeps data locally and supports more word processors; Mendeley offers more free storage. Both handle a master’s or PhD thesis well.
Is Mendeley Desktop still available?
Mendeley Desktop is no longer developed and receives only essential maintenance, according to university library guides. New users are directed to Mendeley Reference Manager and the Mendeley Cite add-in.
Do I have to pay for EndNote?
EndNote is commercial software with a free trial. Many universities provide licenses to students, so check your library’s software page before buying.
Can my examiners tell which reference manager I used?
No. The final document contains formatted text. What examiners notice is consistency: one style, complete records and every in-text citation matched in the reference list.
Can I use two reference managers at once?
For storage, yes; for one Word document, no. Each plugin inserts its own field codes, so cite each document with one tool only.
Sources
- Zotero. Zotero Storage (plans and free 300 MB allowance). https://www.zotero.org/storage (accessed November 2026)
- Zotero Documentation. Word Processor Integration. https://www.zotero.org/support/word_processor_integration (accessed November 2026)
- Zotero Documentation. Word Processor Plugin Usage. https://www.zotero.org/support/word_processor_plugin_usage (accessed November 2026)
- Bodleian Libraries, University of Oxford. Reference management: Mendeley. https://libguides.bodleian.ox.ac.uk/reference-management/mendeley (accessed November 2026)
- UCL Library Services. Mendeley: Versions. https://library-guides.ucl.ac.uk/mendeley/versions (accessed November 2026)
- Clarivate. EndNote. https://endnote.com/ (accessed November 2026)
Sources last checked: November 2026. This article is general educational guidance and does not replace your university regulations or your supervisor’s instructions. How we prepare our content.