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Zotero
zotero.org
What it is
Zotero is an open-source tool for collecting, organizing, annotating, citing and sharing research. Its browser Connector can identify research items during browsing and save them to a library. Collections, keyword tags and saved searches help organize material, while a PDF reader and note editor support working with documents. Zotero supports over 9,000 citation styles and integrates with Microsoft Word, LibreOffice and Google Docs. The desktop app stores research locally by default; syncing is optional. Zotero Storage can sync PDFs, images, web snapshots and other files across devices, with access through an online library. Libraries can be shared with any number of people at no cost, and groups support shared collections. The free plan includes 300 MB of storage; paid storage starts at $20/year for 2 GB. Zotero says synced data is encrypted in transit and newly created accounts' data is encrypted at rest with AES-256. The data server is in the United States. The data server software can be run locally, though Zotero says self-hosting is technically challenging and unsupported. Most support takes place in public forums.
Spec sheet
- What it does
- Zotero collects, organizes, analyzes, annotates, cites, and shares research sources.Read 14 Oct 2026 · zotero.org
- Purpose
- Zotero is a free, open-source tool for collecting, organizing, annotating, citing, and sharing research.Read 29 Sep 2026 · zotero.org
- Platforms
- Zotero offers downloads for Windows, macOS, Linux, iOS, and Android, and a browser Connector for desktop browsers.Read 29 Sep 2026 · zotero.org
- API
- The Web API uses HTTPS at api.zotero.org, while the desktop client exposes a local API at localhost:23119/api/.Read 14 Oct 2026 · zotero.org
- Support
- Most Zotero support occurs in the public Zotero Forums.Read 29 Sep 2026 · zotero.org
- License
- Zotero source code is released under AGPLv3 unless a source file states otherwise.Read 14 Oct 2026 · zotero.org
- API authentication
- Web API access supports API keys and OAuth 1.0a; Zotero 10 local write requests require a local API key.Read 14 Oct 2026 · zotero.org
- Citation styles
- Zotero supports more than 9,000 citation styles and can create references and bibliographies inside Word, LibreOffice, and Google Docs.Read 14 Oct 2026 · zotero.io
- Citation tools
- Zotero supports over 9,000 citation styles and integrates with Microsoft Word, LibreOffice, and Google Docs.Read 29 Sep 2026 · zotero.org
- Collaboration
- Users can share a Zotero library with as many people as they like at no cost, and groups support shared collections.Read 29 Sep 2026 · zotero.org
- Company facts
- LinkedIn lists Digital Scholar as a nonprofit founded in 2009, headquartered in Falls Church, Virginia, with 11–50 employees.Read 14 Oct 2026 · linkedin.com
- Connector requirements
- Connector support covers current Chrome and Edge, Firefox 115+, and Safari 18+ on macOS 13 Ventura or later.Read 14 Oct 2026 · zotero.org
- Data location
- Zotero states that its server data is stored in the United States in AWS us-east-1.Read 29 Sep 2026 · zotero.org
- Documentation and support
- Documentation is extensive and most support is public through forums where developers and community experts answer questions.Read 14 Oct 2026 · zotero.org
- Extensibility
- Community plugins add features and integrations, but plugins have full access to Zotero and the computer and there is no official directory yet.Read 14 Oct 2026 · zotero.org
- Google Docs integration
- The Google Docs connector inserts and refreshes citations and bibliographies and supports more than 10,000 styles.Read 14 Oct 2026 · zotero.org
- Groups
- Group libraries support co-writing, course-material distribution, and shared bibliographies without an extra group fee.Read 14 Oct 2026 · zotero.io
- Intended audience
- Zotero is developed for researchers and cultural heritage institutions by a global community.Read 29 Sep 2026 · zotero.org
- Limit: free storage
- Reviewers complain that the free cloud quota is small, particularly once PDF collections grow.Read 14 Oct 2026 · trustradius.com
- Limit: interface and learning curve
- Reviewers mention dated aesthetics, a learning curve, and the need for more self-training to use Zotero effectively.Read 14 Oct 2026 · g2.com
- Limit: metadata and collaboration
- TrustRadius reviews cite imperfect metadata extraction from some academic sites and a desire for stronger shared-library functionality.Read 14 Oct 2026 · trustradius.com
- Limit: mobile maturity
- Reviewers report that the iPad app needs more iteration and that formatted desktop notes are not fully supported on iPad.Read 14 Oct 2026 · trustradius.com
- Limit: Word Online
- A Trustpilot reviewer says Zotero does not work with Word Online.Read 14 Oct 2026 · trustpilot.com
- Maker organization
- Zotero is a project of the nonprofit Corporation for Digital Scholarship, created at George Mason University's Roy Rosenzweig Center with foundation funding.Read 14 Oct 2026 · zotero.org
- Organization
- Libraries can be arranged with collections, keyword tags, and saved searches that update automatically.Read 14 Oct 2026 · zotero.io
- PDF and EPUB reading
- Zotero provides readers for PDFs and EPUB files with highlighting, notes, images, and ink annotations.Read 14 Oct 2026 · play.google.com
- PDF tools
- Zotero includes a PDF reader and note editor.Read 29 Sep 2026 · zotero.org
- Praise: citation and organization
- TrustRadius reviewers repeatedly praise citation generation, reference-library organization, PDF reading, and metadata collection.Read 14 Oct 2026 · trustradius.com
- Praise: simplicity
- TrustRadius reviewers describe the interface, especially on Linux, as simple and suitable for focused academic work.Read 14 Oct 2026 · trustradius.com
- Praise: source capture
- TrustRadius reviewers repeatedly praise the browser add-on for finding PDFs and metadata while saving sources.Read 14 Oct 2026 · trustradius.com
- Privacy and security
- The desktop app stores research locally by default; syncing is optional, and data synced to Zotero servers is encrypted in transit and newly created accounts' data is encrypted at rest with AES-256.Read 29 Sep 2026 · zotero.org
- Rating on Apple App Store
- 4.6 out of 5 from 432 ratingsRead 14 Oct 2026 · apps.apple.com
- Rating on Chrome Web Store
- 4.0 out of 5 from 2.5K ratingsRead 14 Oct 2026 · chromewebstore.google.com
- Rating on G2
- 4.4 out of 5 from 99 reviewsRead 14 Oct 2026 · g2.com
- Rating on Google Play
- 4.6 out of 5 from 946 reviewsRead 14 Oct 2026 · play.google.com
- Rating on Trustpilot
- 3.7 out of 5 from 14 reviewsRead 14 Oct 2026 · trustpilot.com
- Rating on TrustRadius
- 9.3 out of 10 from 21 reviews and ratingsRead 14 Oct 2026 · trustradius.com
- Recent release
- Zotero 10.0.6 was released October 7, 2026 with full-text-search fixes, PDF rendering improvements, a Mozilla security-platform update, and a local API fix.Read 14 Oct 2026 · zotero.org
- Security architecture
- The desktop app stores data locally by default; synced data is encrypted in transit, new accounts use AES-256 at rest, and hosting is in AWS us-east-1.Read 14 Oct 2026 · zotero.org
- Self-hosting
- The open-source data server can be run locally, but Zotero says setup can be technically difficult and is unsupported.Read 14 Oct 2026 · zotero.org
- Self-hosting limit
- The Zotero data server is open source and can be run locally, but Zotero says this can be technically challenging and it does not support such installations.Read 29 Sep 2026 · zotero.org
- Sync and storage
- Optional Zotero Storage synchronizes PDFs, images, web snapshots, and other files across devices and provides access through the online library.Read 29 Sep 2026 · zotero.org
- Synchronization
- Optional syncing keeps files, notes, and bibliographic records current across devices and exposes them through the web library.Read 14 Oct 2026 · zotero.io
- System requirements
- Desktop support requires macOS 10.15+, Windows 10+, or Linux meeting Firefox 140 library requirements.Read 14 Oct 2026 · zotero.org
- Web capture
- The browser connector detects research pages and saves bibliographic records, available PDFs, and webpage snapshots.Read 14 Oct 2026 · chromewebstore.google.com
- Word processor integrations
- Bundled plugins are available for Microsoft Word, LibreOffice, and Google Docs, with dynamic bibliography updates.Read 14 Oct 2026 · zotero.org
Plans and prices
300 MB Free Free 300 MB storage Read 29 Sep 2026 · zotero.org
Free storage Free 300 MB storage · desktop app free Read 14 Oct 2026 · zotero.org
2 GB $20 a year $20/year (equal to $1.67 per month) 2 GB storage Read 29 Sep 2026 · zotero.org
2 GB storage $20 a year $20/year (equal to $1.67 per month) 2 GB storage Read 14 Oct 2026 · zotero.org
6 GB $60 a year $60/year (equal to $5 per month) 6 GB storage Read 29 Sep 2026 · zotero.org
6 GB storage $60 a year $60/year (equal to $5 per month) 6 GB storage Read 14 Oct 2026 · zotero.org
Unlimited $120 a year $120/year (equal to $10 per month) Unlimited storage Read 29 Sep 2026 · zotero.org
Unlimited storage $120 a year $120/year (equal to $10 per month) Unlimited storage Read 14 Oct 2026 · zotero.org
Strong points and limits
Strong points
- Over 9,000 citation styles
- Integrates with Word, LibreOffice and Google Docs
- Libraries can be shared at no cost
- Desktop research storage is local by default
Limits
- Free storage is limited to 300 MB
- Self-hosting is technically challenging and unsupported
- Most support occurs in public forums
- Server data is stored in the United States
Who it suits
Zotero is suited to researchers and cultural heritage institutions that need to collect, organize and cite research. It also supports groups that want shared collections and libraries.
Zotero in depth
Read the full write-up
Overview
Zotero is a free, open-source reference manager that combines research capture, library organization, PDF annotation and citation tools. It is best suited to researchers who want a flexible library and broad word-processor support without paying to share with collaborators. Its main trade-off is that syncing files across devices may require a paid storage plan, while self-hosting is not a supported route.
Key features
The browser Connector can recognize research items as you browse and save them to your library. Collections, keyword tags and saved searches give you several ways to organize and retrieve material; that flexibility is useful for substantial projects, though the value depends on maintaining a library structure that works for you.
Zotero’s PDF reader and note editor bring reading and annotation into the same workflow as reference management. Citation support spans more than 9,000 styles, with integrations for Microsoft Word, LibreOffice and Google Docs. Those tools make Zotero a strong fit for writers working across common document editors and citation conventions.
Optional Zotero Storage synchronizes PDFs, images, web snapshots and other files across devices and provides access through the online library. Library sharing has no user limit and costs nothing, while groups support shared collections. For privacy-conscious users, the desktop app stores research locally by default and syncing is optional. Data sent to Zotero servers is encrypted in transit; data for newly created accounts is encrypted at rest with AES-256. Server data is stored in AWS us-east-1 in the United States.
The Web API uses version 3 as its recommended default for new development. Zotero also accepts a broad range of imports, including BibTeX, RIS, EndNote XML, MODS, MARC and PubMed XML. Most support takes place in the public Zotero Forums, a practical consideration for users who prefer private or direct support channels.
Pricing
Zotero is free to use, with paid plans chiefly increasing storage for synchronized files. The free plan includes 300 MB, which can suit a library with modest file-sync needs; users with substantial PDFs or other attachments may reach that cap and need to upgrade or manage files another way.
PlanPriceStorage300 MBfree300 MB2 GB$20 a year2 GB6 GB$60 a year6 GBUnlimited$120 a yearUnlimitedThe 2 GB plan is the lowest-cost paid option for users who want more room for synced files, while 6 GB provides additional capacity for larger libraries. Unlimited storage is the clearest fit for users who do not want to manage a file quota. Sharing remains free, so the paid decision is about storage rather than the size of a collaboration group.
Platforms
Zotero supports Android, iOS, Linux, macOS, Windows and the web, alongside a browser extension and API. Mobile apps and word-processor support are available on both major mobile platforms and in both supported word-processor categories. Although self-hosted appears among its platforms, the data server is open source but can be technically challenging to run, and Zotero does not support self-hosted installations. Readers who require a supported self-hosted deployment should look elsewhere.
Who it's for
Zotero is aimed at researchers and cultural heritage institutions, and suits students, academics and other readers who need to collect references, annotate PDFs and produce citations across multiple writing applications. Free, unlimited-person library sharing makes it especially appealing for groups that need collaboration without adding a per-seat cost. It is less suitable for anyone who requires supported self-hosting or wants a larger synced-file allowance without a subscription.
Pros and cons
Pro: More than 9,000 citation styles and integrations with Word, LibreOffice and Google Docs cover a wide range of writing workflows.
Pro: Unlimited-person library sharing and shared collections support collaboration without a collaboration fee.
Pro: Local storage by default and optional syncing let users choose whether to put their library on Zotero’s servers.
Con: The free storage allowance is 300 MB, so users syncing many PDFs and other files may need a paid plan.
Con: Zotero does not support self-hosted installations, despite its open-source data server.
Con: Most support occurs in public forums, which may not suit users seeking private support.
Alternatives
JabRef is worth considering if you want free, open-source reference management and do not need a paid plan. For a free tier with an included 2 GB storage allowance, Mendeley Reference Manager is another option; its free plan also includes five Reading Assistant questions.
ReadCube Papers is a paid option with a free trial, while Paperpile is another paid alternative with a free trial. Sciwand, Lean Library Workspace, EndNote and Bookends are also alternatives.
Explore more options in Citation Management Software and Reference Management Software.
Verdict
Choose Zotero if you want a capable, free research library with PDF annotation, extensive citation support and collaboration that does not charge by group size. Its local-first desktop setup and optional sync are valuable choices, but the 300 MB free storage cap can be restrictive for file-heavy work. Look elsewhere if supported self-hosting is essential or you need a larger synced-file allowance without paying for storage.
Verdict
Zotero combines research organization, PDF tools and citation support, with optional sync and free sharing. Readers considering self-hosting should note Zotero does not support those installations.
Where Specifiction places it
- Reference Management Software#3 of 268.6
- Citation Management Software#4 of 238.6
- Edge Extensions#8 of 238.6
