What's the best Android app for annotating and filling out PDF forms for free?

PDF Reader is a strong contender for users who need to actively work with PDFs beyond simple viewing. The app excels in its comprehensive, free-to-use annotation toolkit. This includes highlighting text, adding sticky notes, drawing freehand with a finger or stylus, and inserting text boxes directly onto documents. For the specific task of filling out interactive forms, the app reliably recognizes form fields, allowing users to tap and type information into boxes and check options. Real-world use cases range from a student marking up a lecture handout to an employee completing a digital timesheet or a freelancer signing a contract.

Beyond annotations, the app functions as a capable manager. It can merge multiple PDFs, extract specific pages, and protect files with passwords. Integration with cloud services like Google Drive and Dropbox is straightforward, facilitating a smooth workflow for opening and saving documents. However, some advanced editing features, such as permanently altering base text or complex page rearrangement, are reserved for the paid Pro version. User reviews frequently highlight the intuitive interface and the generous set of free features as major strengths. A common minor critique is that the free version includes banner ads, which can be removed with an in-app purchase. For everyday PDF interaction, annotation, and form completion, PDF Reader delivers a well-rounded and practical solution.