Annotator - Web & PDF Annotation

Collaboratively annotate, highlight, and tag web pages and PDF documents.

Your Digital Highlighter for the Web & PDFs Turn reading into a conversation. Whether you’re a student, researcher, or just someone who loves to read online, Hypothesis lets you take notes directly on any webpage or PDF—just like you would in the margins of a physical book. Why You’ll Love It: Highlight & Save: Never lose a great idea. Highlight key sentences and save your thoughts directly on the page. Collaborate Anywhere: Create private groups to share notes with friends, colleagues, or classmates. It’s like a book club that lives inside your browser. Works Everywhere: Use it on news articles, blog posts, scientific journals, and PDFs. Your notes stay with the document, so you can find them again instantly. Organize with Ease: Use "Tags" to categorize your research. Searching for that one specific quote across ten different websites has never been easier. Simple & Clean: No complex menus or technical jargon. If you can highlight text with your mouse, you already know how to use Hypothesis. 🚀 Coming Soon: The Future of Reading with AI We are hard at work building powerful AI-assisted features to help you learn faster and smarter. Soon, you’ll be able to: Summarize in a Click: Get instant summaries of long articles to see if they’re relevant to your research. AI Reading Assistant: Ask questions about complex paragraphs and get simplified explanations right in the sidebar. Smart Suggestions: Discover connections between your different notes and find related topics automatically. Getting Started is Easy: Add the extension to Chrome. Open any webpage or PDF. Highlight text to start your first note!