Unlike other PDF tools that just highlight text, AI PDF Annotator lets you chat with AI directly on your documents. Select text or screenshot diagrams/formulas/code — AI explains instantly. Answers are saved as annotations on the PDF. What's different: - Screenshot Q&A — ask about visuals, not just text - Each annotation keeps its own conversation context - Works with Ollama — 100% offline, no data leaves your machine - Free, open source, no account needed