The Obsidian Annotator is a powerful plugin for Obsidian that enables users to annotate PDFs and EPUBs directly within the app. With this plugin, you can highlight, underline, and add notes to your digital books, making it easy to study, review, and organize your knowledge. The plugin also supports custom default paths, page notes, and privacy improvements, ensuring a seamless annotation experience. Plus, with its compact size and regular updates, the Obsidian Annotator is an excellent addition to any Obsidian user's arsenal of productivity tools.