Annotate the web, with anyone, anywhere.

Use open-source Hypothesis annotation to hold discussions, read socially, organize your research, and take personal notes on any webpage, PDF or EPUB.

  • Select text to annotate: Add tags and post publicly or save privately.
  • Reply to or share any annotation: Link to notes or whole pages.
  • Annotate together in groups: Collaborate privately or publicly with others.
  • Search your notes: Explore all public annotations and profiles.

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