Annotation Tool

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Sites where Annotation Tool is a core feature are shown first, marked with a Core badge.

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Collaborate on documents with real-time annotation

Hypothesis lets you highlight, comment, and discuss web content or PDFs with others, making it easy to collaborate and engage in online learning.

Annotate and share research papers online

Fermat's Library lets you upload, annotate, and share academic papers, making it easy to discuss research and collaborate with others online.

Publish and annotate articles on your own terms

dokieli lets you create, publish, and annotate articles directly in your browser, supporting decentralized publishing and social interaction.

Annotate data for AI and NLP—no ML experience needed

Prodigy is a downloadable tool for annotating data in AI, machine learning, and NLP projects, making it easy to train and evaluate custom models.