Start with the document you need to finish
A reference manager should help you find and cite a source. It should not make you lose your train of thought. The best choice is the one that fits the way you read, write, and share work.
For most students starting from scratch, I would pick Zotero. It saves sources, helps you write, and keeps files on your own drive. That is a strong base for a long project. Mendeley can still suit a group that has built a library there. Switching software has a cost, even when the new app is free.
The Zotero vs Mendeley decision comes down to three questions. Where do you write? What do you save? Who needs to work with you? Start there before you compare extra features.
Zotero and Mendeley at a glance
| Zotero | Mendeley |
|---|---|
| Best fit: varied sources and flexible writing tools. | Best fit: a PDF library and a group already using Mendeley. |
| Word, LibreOffice, and Google Docs support. | Mendeley Cite is built for Microsoft Word. |
| 300 MB of free online file storage. Local storage is separate. | Check the storage allowance and upgrades in your account. |
| Open-source desktop app, with optional paid file sync. | Elsevier's reference management software, with a free starting point. |
| Official iOS and Android apps. | Check the current download options for the devices you use. |
What each reference manager does
Zotero lets you gather citation records, keep files with them, and add notes. A record holds details such as the author, title, date, and journal. You can save a book, a web page, a report, or an article. You do not need a PDF for every source.
Mendeley Reference Manager also keeps a library of sources and files. Its current features include PDF import, a web importer, watched folders, and shared groups. Mendeley Cite adds citations in Word.
Both reference managers keep sources close to the writing that uses them. Neither removes the need to check a source. Even a tidy library can have a wrong date or a name in the wrong field.
Word and Google Docs: choose your writing tools first
Zotero's writing integrations cover Microsoft Word, LibreOffice, and Google Docs. Add a citation and the tool can update your source list too. You can change citation styles. You do not need to redo the whole list by hand.
Google Docs integration is a clear reason to favor Zotero. It uses the Zotero Connector browser extension and the Zotero app. A group writing a shared paper should set this up before the first draft, not the night it is due.
There is one catch. In a shared Google Docs document, careless edits can break live citations. Zotero advises coauthors to use the Connector and avoid editing citations at the same time. Its Google Docs guide explains these limits and the setup steps.
Mendeley Cite works in a panel beside your document. It can search your Mendeley library and insert references without the desktop manager open. That may suit a Word-based group that wants to stay in the same writing window.
Before you commit, test your school or work account. Your school or workplace can limit which add-ins you may use. A tool that works on a personal laptop may not work on a managed one. The Mendeley Cite page lists supported Word versions.
For a fair trial, create a short document with three citations. Include a page number, cite two sources together, then change the style. This simple check tells you more about daily use than a long feature list.
Collecting references from more than PDFs
Zotero is a good fit for work that draws on library catalogs, journal sites, reports, and web pages. The browser extension helps create citation records as you read. It can save source details even when there is no full-text file.
Mendeley's browser extension, Web Importer, also collects sources from the web. Its current desktop tools let you import PDFs and watch a folder for new files. That suits people who get most of their papers as downloads.
Whichever reference manager you choose, check the first few records from each source. PDF metadata is not always clean. A title may be missing, or a group author may be split into a person's first and last names. Fix those fields when you save the item.
For literature reviews, use a small set of tags with a clear purpose. A tag such as “read next” is useful only if you act on it. Hundreds of narrow tags can turn reference management into a second project.
Reading, PDF annotations, and notes
Zotero's built-in PDF viewer lets you read and mark up a paper inside the library. You can turn annotations into notes, with links back to the source. That helps you turn marked passages into points in your draft.
Mendeley also supports reading and annotating PDFs, including shared work in groups. If your group already discusses papers there, that shared habit may matter more than a small difference in the reader.
Do not judge PDF management by the number of highlight colors. Try this instead: mark one claim, add a note that explains why it matters, and find it again a day later. Then check whether you can carry that note into your draft.
Reference managers and note-taking apps serve different roles. The reference manager keeps the source record. A notes app can hold your own ideas across many sources. Our Notion vs Obsidian comparison covers that second choice.
Storage costs: local files and online copies are different
Zotero gives you 300 MB of free storage for synced attachment files. That is not a cap on the files you can keep on your own computer. Keep that in mind if you read large scans or save many PDF files.
Its listed file-storage plans are $20 a year for 2 GB, $60 for 6 GB, and $120 for unlimited cloud storage. Those fees are for a full year. The app's core features remain free. Check the Zotero storage plans before you buy.
How much storage should you pay for? First decide which files need to be on different computers or a tablet. A library of small journal articles has different needs from a shelf of scanned books. Check actual file sizes before choosing a plan.
For Mendeley, review the free allowance and paid plans shown in your signed-in account. Ask if your school gives you extra access. Do not pay for a second plan until you know what you already have.
A synced library is useful, but it is not your only backup. Keep a separate backup of important work. Test that you can open it. A copy you have never checked is a weak safety net when a deadline is close.
Sharing a reference library
Zotero groups let researchers share references. Mendeley's groups also let people build a shared library and work with PDFs. Both can support a reading group, a course team, or co-authors.
Agree on a few rules before adding hundreds of items. Decide who checks for copies of the same record. Agree on tags and who checks the final source list. Software cannot fix a tag that means three things to three people.
Test access with a real coauthor. Add a source, attach a file you have the right to share, and ask the other person to open it. Then make a small change. Check that the change arrives where you expect.
You may be able to share a citation record but not the paid article itself. Follow your library's terms when sharing full text.
Mobile apps and work away from your desk
Zotero has official mobile apps for iOS and Android. This helps if you read on a tablet. Check that your files have reached the device before you go offline.
For either tool, test the whole route from reading to writing. A highlight on a tablet is only helpful if you can find it when you open your draft. Use the same source for the test on each device.
If you mainly work at one desk, mobile features may carry little weight. Spend that time checking source capture and citation styles instead. Choose for your real research workflows, not for a routine you hope to adopt later.
Mendeley Desktop and AI features: watch the version
Older guides often describe Mendeley Desktop. That is not the same product as Mendeley Reference Manager. Check which app and citation tool a guide is about before you follow it.
The current Mendeley features page also promotes “Ask AI.” Do not assume an older comparison that says Mendeley has no AI features still describes the product you will use. Check the available plan, file support, and limits before treating an AI tool as part of your routine.
AI tools can help explore research content, but an answer is not a checked source. Open the paper, find the passage, and confirm the meaning. Do not put private data in a service your school has not approved.
The same care applies to third-party add-ons. Extra features can be useful, but every add-on adds another part to maintain. A small, reliable setup often serves a long writing project better than a stack of tools you barely use.
Should you move an existing library?
If your current system works, do not switch during the final stage of a paper. Move a small sample first. Include a journal article, a book chapter, a web source, a PDF with notes, and a record with unusual author details.
Compare the imported records with the originals. Check files, tags, notes, and special characters. An import can finish and still lose details. Check live citations in your draft too.
Keep the old library until the new one is sound. For a thesis or long report, try the new tool in a fresh document before changing the working draft.
If your next task is coding interviews rather than managing references, see MAXQDA vs NVivo. A reference manager helps track sources; qualitative analysis calls for a different set of tools.
The choice I would make
For a new library, Zotero is my first choice. It fits many source types and ways to write. You can build your library around local files. Google Docs integration makes that choice especially clear for many student groups.
Choose Mendeley when an existing team and Word-based workflow make it the simpler path. A tool your group knows can save more time than a feature you would use once.
In Zotero vs Mendeley, a short trial with your own work is the deciding step. Save ten real sources. Read one paper. Write one page. Share it if you need to. Pick the reference manager that leaves you with fewer repairs and more time to think.