![]() ![]() Optical Character Recognition (OCR) – This ability to convert a scanned or imaged PDF to a computer readable text and save the converted document is an important feature.The tools for annotation – One important aspect of PDF readers for me is the basic ability to markup, comment on, add drawing elements in a PDF and save the document with the alterations but without unwanted trial software watermarks. ![]() The document reading experience – This factor includes how intuitively the program operates, the speed of rendering text and images, and the navigation controls.The graphical user interface (GUI) – While I do have a bias toward programs that are aesthetically pleasing, ease of use is also important in the GUI evaluation.Speed of opening files – While a second or two difference in opening files doesn't make too much difference to me, delays beyond a few seconds tend to annoy me.With the exception of this 3D file, if a reader was unable to open any of the test files, it was eliminated from consideration. I do note that none of the programs reviewed were able to render an Adobe 3D image test file correctly. These are typical files used in both office and recreational computing, the kind of PDF files that most people want to read. I assembled a set of about a dozen test files using various combinations of size, security, and form and image content. Ability to open PDF files – All PDF files are not created equal. ![]()
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