Reviewed by Alexis Morain · Updated July 14, 2026
The reference open-source reference manager, free and privacy-respecting, where only cloud storage beyond 300 MB is paid.
Zotero is an open-source reference management tool, widely used in academia and research. It lets you collect, organize, annotate and cite sources (articles, books, web pages), with direct integration into word processors to generate bibliographies and citations in the desired styles.
Zotero is used to manage research documentation: capture a reference in one click from the browser, organize it into collections, add notes and PDFs, then insert citations and a bibliography into a document, in thousands of styles. It is a reference tool for students, researchers and writers, against competitors like Mendeley.
Against Mendeley, owned by Elsevier, Zotero bets on open source, independence and privacy. Both cover the same basic needs; Zotero appeals to those who prefer a free tool not backed by a commercial publisher.
Zotero is free and open source, with no limit for managing references locally. Only cloud storage to sync your PDF files is paid beyond a free 300 MB, via annual storage subscriptions (around $20 to $120 a year by capacity).
Reference collection
One-click capture from the browser
Organization
Collections, notes and PDFs
Citations
Bibliographies in desired styles
Integration
Word, LibreOffice and Google Docs
Zotero is free and open source: reference management, organization, notes and citation and bibliography generation carry no cost, with no limit locally. Only cloud storage, to sync PDF files across devices, becomes paid beyond a free 300 MB, via annual storage subscriptions (around $20 to $120 a year by capacity). Most uses fit within the free version.
Free plan / trial
Free and unlimited locally; 300 MB of cloud storage included.
Zotero
Unlimited reference management · Citations and bibliographies · 300 MB storage included
Free
Cloud storage
PDF synchronization · Capacity by subscription · Optional
~$20 to $120 per year
Pricing verified on July 14, 2026
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