To continue using Nitro Pro after the trial period has expired, it is necessary to purchase a license that must be activated on your computer. Activation ensures that you have bought a genuine Nitro product by linking the software license to the computer on which it is installed.

Stamp annotations let you add editable stamps to pages as annotations. The built-in stamps (such as Paid, Reviewed, and Approved) give you a simple means to indicate the status of a file. Using the custom stamp feature, you can type your own text to create a stamp, or use any image or PDF file into your own stamp.

You can add links manually to your PDF pages by clicking the Link tool and drawing the outline of the link on the page. Once it’s added you can edit its appearance and set the action it should perform when clicked by the user.

Simplified field notation is written more like formulas you add in spreadsheet applications like Microsoft Excel. Writing a notation is often an easier solution when adding calculation scripts.

Any form you create that requires calculations is likely to require custom calculation scripts. The options you have available with preset calculation formulas are limited to simple multiplication and addition. Other kind of calculation you need requires writing a script.

You can use JavaScript to add an almost infinite number of interactive features, create complex calculation formulas, and add more dynamic functionality to your PDFs.

Folder level JavaScripts are JavaScript files (.JS) that are run during application startup. These can be useful for loading reusable JavaScript functions into the application, or accessing methods/properties whose security restrictions only allow them to be run in the app/init event.

Just as you would with a paper document, you can place notes and write annotations anywhere in a PDF file. Notes let you direct the attention of readers to a specific area of the page, and to include special instructions for a person reviewing the document.

Nitro Pro features mark-up tools to help you draw attention to text that requires revision. These tools are a useful way to combine feedback or comments with every mark-up.

The following topics provide background information for Nitro Pro, and describe technical matters related to PDF files:

Repetitive tasks involving one or several documents can be automated with the Batch Processing tool.

Nitro Pro supports field calculations using several methods. The built-in calculation formulas are an easy means for creating simple, and quite restricted, field calculations. You can also use Simplified Field Notation and JavaScripts, although these methods are much more sophisticated and require some programming knowledge. If your calculation needs are limited to summing or averaging data, you can use the built-in formulas without having to worry about programming.

Digital IDs let you encrypt files that can only be opened and used by people who have exchanged certificates. Certificate-based security has many advantages over password-based security: documents can be opened without the need to remember passwords, Digital IDs cannot be shared or copied easily, the one document can contain different security settings for each recipient of a file. For example, you may grant one person editing and printing privileges, while another is limited to just viewing the file.

When you receive feedback from multiple participants, each in a different copy of the original PDF file, you may find it helpful to merge these comments into a single PDF file for easier review.

PDF (or Portable Document Format) is the most widely used standard for online distribution and exchange of digital documents across both personal and professional environments. Here are some of the many advantages of using PDF documents:

When creating many of the same type of form field, the quickest and easiest method is to use the Make Copies tool. Just setup the form field with the appearance and other properties you’d like all the fields to be like and then chose how many rows and columns you want.

This object allows you to get and set the properties of a PDF link, as well as set a Run a JavaScript action.

Add a link Edit a link Automatic page number links Create web links from URLs Create keyword links automatically

The Measure tool enables you to easily define the distance, area, and perimeter for a set of points based on a scale that you define.

The drawing tools in Nitro Pro allow you to add predefined shapes (for example, lines, rectangles, or ovals) as well as free-form drawings to your PDF documents. These drawing tools include a corresponding pop-up note, enabling you to provide additional comments or further explanation for each drawing. You can also change the appearance of your drawings, with options for color, opacity, pointer styles, and more, depending on the type of drawing you use.

Nitro Pro lets you view all comments in your PDF file from a single location. The Comments pane lists all of the comments in your file, along with information relating to each comment.

You can view two or more PDF documents side-by-side in Nitro Pro without needing to use two screens, and without running another copy of the application.

Microsoft Rights Management (RMS) provides a service that protects and shares files by allowing you to encrypt your sensitive documents and restrict access to approved individuals only.

The Navigation Panes are useful when browsing larger PDF documents, giving you a global view of the pages and bookmarks included in the document.

This object provides support for Optional Content Groups. OCGs hold a collection of graphical objects, and are known as layers. You can dynamically switch properties of layers to make them visible or invisible to provide navigation in a PDF document.

When you click a PDF file in your web browser, the Nitro Web Browser Plugin reads the file and displays it in the web browser.

The I.R.I.S. OCR plugin fully integrates with Nitro Pro allowing it to recognize text from scanned pages, or from images in open PDF documents. The OCR utility is fully customizable, with options to configure options such as skewed image correction, to image compression settings. You can also enable text recognition for scanners directly on the Create PDF From Scanner dialog, to automatically create PDF documents from scanned pages with text that can be modified or searched.

A static object that represents the PDF viewer application.

The image arranging tools let you move images in front and behind other objects on the page, flip or mirror, and rotate them.

Just like attaching a paper file to another with a paperclip, the Attach File annotation tool enables you to attach electronic files to your PDFs files. Annotation attachments appear as a paperclip icon on the PDF page; reviewers can double-click the icon to open the file. You can view annotation attachments in the Commenting pane and the Attachments pane.