Features and Performance
Nitro has a long list of included features, some of which will be quite handy in an Enterprise context. While I did not try any multi-user projects, PDFs can be worked on by multiple authors, digitally stamped to indicate who and when and securely encrypted after digital certification or signing. It also offers users the ability to add Bates numbers.
PDFs made with Nitro adhere to the standard ISO format, which allows them to be read by anyone with PDF readers made by other companies, as well as giving Nitro the ability to edit other PDFs opened in the application. You choose whether to make a PDF, a flattened PDF or a PDF/A.
Editing inside a PDF is possible – on a paragraph level. Within a paragraph – each a separate object – text can be inserted or deleted, and the entire paragraph will re-flow. Because paragraphs are separate objects, the re-flowed lines can make the paragraph longer and alter the spacing inside the PDF, as the new line can overlap an existing paragraph that is not being edited, depending on the spacing.
For extensive editing, or adjustments involving insertions, converting the PDF back to Word, Excel or PowerPoint is recommended. This also means that using the delete function inside a paragraph you are editing leaves a blank area on that page.
Exporting back and forth to MS Word was clean – no changes in the text or font. I did notice that the document, which had been imported into Nitro PDF with the box Convert Headings to Bookmarks option checked did indeed open in the PDF with bookmarks for the headings. However, converting it into a MS Word doc, editing some normal text, and converting it to a PDF file again lost the style on the headings, so they reconverted as bold normal text.
There is a setting in the Nitro Pro preferences for conversion, which when checked is supposed to detect headers and footers and make sure they keep that style in the new doc, but it does not reimport bookmarks in the PDF as headings. You'll need to reapply the heading style to have bookmarks in the reconverted version.
A similar problem occurs when converting and re-converting Excel files. The original conversion made bookmarks from sheet names in a workbook, giving each sheet a page in the PDF. Converting that back to a workbook did make each page a sheet, but the sheet titles reverted to Sheet 1, etc., rather than taking the bookmark name for the sheet name.
Ordinarily text or other additions added to a PDF or any edits are kept on an annotation level, not the content level. You can open the edit tab, and insert material on a page on the content level by using the flatten selection, flatten all or save as a flattened PDF options.
New features such as OCG support allow the user to modify content in layers, and print only the layers that are active. While you cannot create OCG content in Nitro Pro, importing layered content adds versatility.