Zotero vs Mendeley: Which Reference Manager Should You Use in 2026?
Compare Zotero and Mendeley free plans, Word plugins, AI, and migration, including Elsevier ownership and the practical costs of moving your library.
Zotero and Mendeley both let you start for free: Zotero suits researchers who value plugins and a long-term library, while Mendeley offers more free official cloud storage. If you already have manuscripts, first identify your Mendeley client and Word plugin versions: they directly affect migration.
Mendeley Desktop, Mendeley Reference Manager, and Mendeley Cite differ in export workflows and citation compatibility. With Zotero, include official attachment storage limits in your cost assessment.
This Zotero vs Mendeley comparison covers free-plan limits, data portability, writing integrations, and AI workflows to help you choose a tool and decide whether to migrate.
About this article
This article mainly compares Zotero with Mendeley Reference Manager, noting differences from the legacy Desktop client. It draws on official documentation and community discussions, without controlled performance benchmarks. It is written by the BibGenie team; BibGenie is the Zotero AI plugin we develop.
At a glance: who should choose Zotero or stay with Mendeley?
| Your priority | Consider first | Also check |
|---|---|---|
| A long-term library, extensions, and control over data | Zotero | Plan attachment syncing, backups, and plugin maintenance |
| More free official cloud space for attachments | Mendeley | The free plan includes 2 GB of personal storage; AI and collaboration benefits vary by plan |
| An established Mendeley collaboration workflow | Keep Mendeley initially | Test a real manuscript before deciding to migrate |
| LibreOffice or several writing tools | Zotero | Integrations are available for Word, LibreOffice, and Google Docs |
| Manuscripts already contain many Mendeley Cite citations | Keep the existing citation tool for those manuscripts initially | Zotero cannot read Cite fields, so documents need separate handling |
| AI reading, search, and organization inside Zotero | Zotero with appropriate plugins | Assess plugin and model-service costs separately |
Try Zotero first for a new long-term research library. If your Mendeley workflow is stable, test Zotero on a new project before moving existing libraries and manuscripts.
Free plans: software, cloud storage, and AI access
Free reference management and attachment syncing are different
Both tools offer a starting point without software fees, but organize their free benefits differently.
| Item | Zotero | Mendeley |
|---|---|---|
| Core reference management | Free | Free plan available |
| Free official cloud file storage | 300 MB | 2 GB of personal storage |
| AI features and costs | Added through plugins; costs depend on plugin and model service | Reading Assistant access and remaining questions depend on the account; additional features vary by plan |
The 2 GB allowance is personal storage, not shared group storage. Mendeley lists separate limits for group storage, and personal storage upgrades do not increase shared space. Check the current group limits before choosing a team workflow. Free account and shared storage limits
See Zotero Storage and Mendeley Pricing for storage and AI entitlements. Confirm limits and billing before purchasing.
If you want the same PDFs available across devices, Mendeley's free storage is more generous. If you mainly work locally, cloud capacity alone will not tell you which tool is better suited.
After migration, test attachments separately: open several PDFs on another device to confirm that the files uploaded completely. A reference appearing in the library does not prove its attachment has synced.
A practical way to assess storage needs
Take a representative set of papers and check the actual size of PDFs and supplementary materials. Decide which files need cross-device access. Scanned books, image-heavy papers, and supplementary data can be much larger than text-based PDFs; counting papers alone is insufficient.
For a research group, also check how shared and personal references are billed, what happens when members leave, and who maintains attachments. More free personal storage does not automatically make a tool better for team collaboration.
Mendeley's Elsevier ownership: what matters in practice?
Assess account and data dependencies alongside ownership
Mendeley announced that it was joining Elsevier in 2013. Mendeley's acquisition announcement
When selecting a long-term research tool, examine how your accounts, data, and writing depend on the platform:
- Where are references and PDFs stored, and which tasks require a cloud account?
- How can you recover access after closing an account, changing institutions, or encountering login problems?
- Can references, annotations, notes, and folders be exported separately?
- Can a manuscript's citations still be maintained after changing plugins?
These checks apply to other commercial platforms too. Account recovery, export coverage, and offline access reveal migration costs more directly than ownership alone.
Distinguish these three names
| Name | What it means | Why it matters |
|---|---|---|
| Mendeley Desktop | The legacy desktop client | Many tutorials and impressions refer to this generation |
| Mendeley Reference Manager | The current reference management client | Its operations, export, and syncing workflows differ from Desktop |
| Mendeley Cite | The Word citation add-in | Its document fields differ from the legacy Desktop plugin's fields |
In 2025, Mendeley announced that Desktop would receive essential maintenance, including critical security fixes, but no new feature development. Mendeley's Desktop maintenance statement
When looking for tutorials or troubleshooting, identify whether the advice concerns Desktop, Reference Manager, or Cite, and which version it covers.
Data portability: check records, PDFs, annotations, and notes separately
Exchange formats such as RIS and BibTeX mainly transfer reference records. Zotero's Mendeley import guide explains that they do not preserve all folders, fields, and PDF annotations. To migrate those, prioritize testing the built-in online importer. Zotero's Mendeley import guide
The guide also documents how encryption of Mendeley's local database limited the former local import approach. The current online workflow requires data and attachments to be synced to Mendeley's servers first. Being able to export references does not mean you can migrate your complete research library offline. During a trial, check account access, attachment upload status, and whether the materials may use the relevant cloud service.
If annotations are central to your research, separately test exporting annotated PDFs: in an item's Info → Files section, open the file's three-dot menu and choose Export PDF with annotations. Seeing annotations in a PDF and importing them as editable objects in another application are separate things to verify. Mendeley: export a PDF with annotations
Validate Notebook notes, PDF highlights, and sticky notes separately. A Zotero forum user reported that highlights and sticky notes transferred while Notebook content did not appear completely. Discussion of annotations and Notebook migration
Before committing your whole library, test exporting and restoring a small sample, especially important annotations and notes.
Moving from Mendeley to Zotero in four stages
1. Record the source environment and manuscript status
Note the client version, Word version, and add-in name. Save a copy of a manuscript containing page locators, grouped citations, and a bibliography for comparison after migration.
List your most important content: folders that must survive, annotated PDFs, and reading notes stored in Notebook. This checklist defines your later validation.
2. Start by testing Zotero's built-in online importer
Confirm that source records and attachments are synced and accessible in Mendeley online. Update Zotero, choose its Mendeley online import option under File → Import, and follow the authorization prompts. See the official guide for steps and known issues.
Online import requires a working Mendeley account and service authorization. Resolve account access problems first; institutional-login users should also follow the guide's instructions for linking personal and institutional accounts.
Online import does not directly support group libraries. You can copy relevant group items into a collection in your personal library, import them, and rebuild their organization in a Zotero group. Agree on the scope with other maintainers and preserve the original group library.
3. Validate each part beyond the import-complete message
| Content | What to confirm |
|---|---|
| Records | Correct titles, authors, years, DOIs, and item types |
| Folders | Topic hierarchy and membership match expectations |
| PDFs | Files open directly and remain available on other devices |
| Annotations and notes | Highlights, sticky notes, and Notebook content preserve what you need |
| Writing connections | The destination plugin recognizes and refreshes existing document citations |
For unexpected results, reproduce the issue with a few records and consult current import documentation and forum answers. Preserve the original library until validation is complete, and avoid repeatedly importing the same material.
4. Handle manuscripts according to the Word plugin
Distinguish legacy Desktop citations from Mendeley Cite citations:
- Citations inserted by the legacy Mendeley Desktop plugin: after importing references with Zotero's built-in Mendeley importer, Zotero's Word and LibreOffice plugins can read the old citations and relink them to imported items. This is different from a simple RIS or BibTeX import. Test refreshing in a document copy afterward.
- Citations inserted by Mendeley Cite: Zotero cannot read these citation fields. After moving the library, the manuscript's citations still need separate handling.
See citation compatibility in the Zotero import guide and guidance for existing document citations.
For the latter case, continue using Mendeley Cite for that manuscript if practical. If conversion is necessary, rebuild Zotero citations section by section in a copy, checking locators, prefixes, suffixes, grouped references, and the bibliography. Unlinking fields leaves plain text; it does not relink citations.
Word plugins and citation styles: test your writing environment
Zotero officially supports integrations for Word, LibreOffice, and Google Docs. Mendeley Cite is a Microsoft Word add-in. Check supported Word and operating system versions separately. Zotero integrations, Mendeley Cite
Mendeley Cite obtains reference metadata from your cloud library without requiring the legacy Mendeley Desktop application to be installed or running. Official Mendeley instructions
Before choosing, test both systems with the same short writing task:
- Cite two papers by authors sharing a surname and publication year, checking disambiguation.
- Insert several references together, then add a locator or prefix.
- Switch to the target journal style and check footnotes, author lists, and journal abbreviations.
- Have a collaborator take over the file and test editing and refreshing.
If a step only works for you on one computer, resolve the collaboration conditions before comparing personal operating speed.
AI: official Mendeley features and Zotero extensions
Mendeley AI and plan limits
Mendeley's pricing page lists Reading Assistant, with Ask My Library and Compare Experiments in higher tiers. The free plan provides 2 GB of personal storage. The official pricing page lists 5 Reading Assistant questions; eligibility and remaining questions depend on what your account currently shows. Do not assume this allowance renews monthly. Additional AI features depend on the paid plan. Current Mendeley plans
Before upgrading, decide whether you need help reading one paper, asking questions across a library, or comparing studies, then check that the account plan includes that capability.
Zotero extensions and BibGenie
If you want to keep your Zotero library, add an AI plugin suited to your research tasks. BibGenie, which we develop, supports questions about papers and notes, research discovery through OpenAlex, and library organization inside Zotero. When answers include source citations, return to the material to check the claims.
For third-party plugins, evaluate plans, model settings, and data flows separately. Using your own API key does not mean inference is free: costs depend on the model provider and plan. Start with the BibGenie setup guide.
For a trial, ask: “What are this paper's main limitations, and what passages support each one?” Check accuracy, how easily you can verify sources, and how many steps the process takes.
For reading, translation, notes, and LaTeX extensions, see our Zotero plugin recommendations.
Frequently asked questions
Next step: test a new draft and an existing manuscript
A new draft helps compare working habits; an existing manuscript reveals migration costs. Test both before deciding whether to move everything together or introduce the new tool on new projects first.
If you are also considering EndNote, read EndNote vs Zotero. For more free, trial, and institutional options, see the reference manager selection guide.