Diigo
Bookmark, highlight, and annotate web pages and PDFs for smarter research and collaboration
| What is it | Bookmark, highlight, and annotate web pages and PDFs for smarter research and collaboration |
|---|---|
| Pricing | Freemium — from $10/mo |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Works with | IFTTT, Make |
| Best for | collecting and organizing online research sources, annotating web pages and PDFs for study or review |
| Domain registered | 2004 |
Data updated Aug. 1, 2026
What does Diigo do?
Diigo is a tool for anyone who spends a lot of time reading and researching online. Think of it as a personal library for the web — you can save bookmarks, highlight text on any page, add sticky notes with your own thoughts, and tag everything so you can find it later. It also lets you archive web pages (a premium feature), so even if a page goes offline, your highlights and notes stay intact. The outliner feature helps you organize your links and notes into structured outlines, which is especially handy for big projects or papers.
What makes Diigo stand out is how it combines bookmarking, annotation, and collaboration in one place. You can share your research with classmates or colleagues by joining a Group, where everyone can contribute highlights and notes on the same set of pages. The sticky notes and highlighter work directly on any webpage as you browse, and everything syncs across devices via the browser extension. It’s not flashy — it’s just practical. The free tier covers the basics (bookmarks, tags, highlights, sticky notes, groups), and the paid plan adds archiving, more storage, and ad-free browsing.
Researchers, students, and knowledge workers get the most out of Diigo. If you’re writing a thesis, preparing a report, or just trying to keep track of useful articles, it saves you from drowning in browser tabs. Teams working on collaborative research can share annotated resources without emailing links back and forth. It’s a straightforward tool that does one thing well: making online research less messy.
Key features
What makes it stand outWho is Diigo for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardFree
- 100 lifetime highlights
- 500 lifetime cloud bookmarks
- Personal core features
- With Ads
- Cloud bookmarks: 500 (lifetime)
- Webpage and PDF highlights: 100 (lifetime)
Standard
- No Ads
- Unlimited Cloud Bookmarks
- Unlimited Webpage and PDF Highlights
- Unlimited Image Storage
- Unlimited Cached Pages (Webpage Backup)
- Import kindle highlights & notes
- Unlimited PDF Storage
- Unlimited Outliners
Professional
- No Ads
- Unlimited Cloud Bookmarks
- Unlimited Webpage and PDF Highlights
- Unlimited Image Storage
- Unlimited Cached Pages (Webpage Backup)
- Import kindle highlights & notes
- Unlimited PDF Storage
- Unlimited Outliners
Business
- No Ads
- Unlimited Cloud Bookmarks
- Unlimited Webpage and PDF Highlights
- Unlimited Image Storage
- Unlimited Cached Pages (Webpage Backup)
- Import kindle highlights & notes
- Unlimited PDF Storage
- Unlimited Outliners
- Unlimited team library storage for Webpage, PDF and Images
- Collaborative Web annotation in Team
- Collaborative PDF annotation in Team
- Admin console dashboard
Trust & presence
Gallery
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