Best PDF annotator AI tools

Liner is an AI-powered research assistant and web highlighter that enhances your online reading and research. It acts as an AI copilot, providing instant, fact-checked answers and summaries on search result pages and websites. Highlight text on any webpage or PDF, organize your findings into collections, and accelerate your learning and productivity.

Logically.app (formerly Afforai) is an all-in-one AI workspace for students and researchers. It integrates a reference manager, file annotator, AI research assistant, and a collaborative document writer to streamline the entire academic workflow, from research and analysis to writing and citation.

Glasp is a social web and PDF highlighter that helps learners and researchers capture, organize, and share insightful ideas. It uses AI to create a personalized knowledge base from your highlights, offering features like AI-powered summaries, chat with your notes, and seamless integration with popular note-taking apps. It's designed to facilitate public learning and build a collective intelligence.