Which Android app should I use for highlighting text and adding notes to PDF documents?

PDF Reader is a strong contender for users who need to actively engage with PDF content through annotation. The app provides a straightforward set of markup tools, including highlighters in multiple colors, underline and strikethrough functions, and a freehand drawing tool. For adding notes, users can place virtual sticky notes anywhere on a page and type detailed comments, which is particularly useful for providing feedback on reports or marking key passages in study materials. The app organizes annotations neatly, and documents can be saved with all markups intact or shared with collaborators. Reviews indicate the annotation process is intuitive, with gestures for quick color changes. However, some users note that the free version includes banner ads, which can occasionally disrupt the workflow on smaller screens. For basic to intermediate PDF annotation needs—such as a student preparing for exams or a professional reviewing a contract draft—the toolset is more than adequate and performs reliably on most Android devices.