PDF Reader - Free PDF Viewer, PDF Editor, PDF Annotator, PDF to Office Converter, PDF Sign, Form Filler, PDF Merger, and Note-taker, Best Alternative to Adobe Acrobat. Free +. PDF documents Apple's Books app is not a bad PDF reader, and in recent iOS versions even offers decent annotation tools. But it may choke on larger PDFs, and simply isn't enough for more professional use. Readdle's PDF Expert ($) is the most popular choice here. It isn't cheap, but is a well made and well supported tool.
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