Acrobat's interface, in contrast, is a more-or-less unique combination of toolbars and panels that you'll need to spend some time exploring if you want to use all its features. Anyone who uses Office will be able to use Nitro PDF instantly.

Nitro's interface looks and feels like Microsoft Office's ribbon, with a row of tabs along the top, each tab offering an array of icons. Some of Nitro PDF's features-notably the ability to redact (permanently remove data from) PDF files-are available only in Acrobat's higher-priced Pro version, not Acrobat's Standard version, Acrobat Pro of course offers a vast range of corporate-level features that Nitro PDF doesn't try to match, including automation tools and the ability to create dazing PDF portfolios. Acrobat Nitro PDF, like Acrobat, lets you add, remove, or shuffle pages in a PDF file, create bookmarks or links, create fill-in forms, and add comments and other markup, and create and use digital IDs. PDF 'printers' are typically free or donation-ware programs that let you create a PDF file by 'printing' from any application to a PDF file. While low-end freeware PDF editors exist, I think it's worth spending money to get full-featured software like Adobe Acrobat or Nitro PDF Pro. PDF editors typically let you create PDF files from documents or other applications, add or remove text, images, or pages from an existing PDF, and add security features to PDF files. Readers are generally either free for the download, like Adobe Reader, or built into the operating system, like OS X's Preview. The PDF Lowdown PDF software falls into three categories: readers, editors, and 'printers.' With minor exceptions, PDF readers don't let you modify PDF files, only view them.

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