The Whiteout tool enables you to securely delete selections of text, images, annotations, and even form fields from a PDF page. Perfect for when last minute mistakes are found in a document, or when content cannot be divulged to a specific recipient.

Text boxes allow you to position important text clearly on the page. text boxes are always visible. Unlike sticky notes, they cannot be opened or closed.

Nitro Pro enables you to quickly summarize all of the comments contained in your PDF documents. Summarizing comments allows you to view all of the comments alongside the contents of the document. When comments are summarized, each comment is displayed as a callout alongside the original PDF page, allowing you to quickly view the contents of each comment side-by-side with the original document. Each callout is also assigned an ID, and an accompanying summary table lists each comment by ID, along with the contents and other details of the comment. This makes it very convenient to view all of the comments at once, as well as flip back and forth between pages of the document to view comments individually.

The Comments pane allows you to keep track of comments that have been added to PDF documents. The pane displays a list containing each comment, along with its type, reviewer name, time stamp, any text feedback, as well as any replies.

The Nitro Pro text mark-up tools let you work with a PDF file as if it were a printed on paper, and you can undo and redo a modification should you wish to correct a mistake.

Nitro Pro makes it easy for you to reply to individual comments made by other reviewers. Each reply is linked with the original comment, allowing you to review multiple replies in the Comments Pane. This can streamline electronic document review cycles by organizing multiple replies so that they appear in a thread, and save you from having to sort through them one-by-one.

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.

To view a PDF document without comments displayed on the page, you can hide all comments at once, rather than closing or deleting each comment manually. The same control lets you show all comments.

Reporting all the modifications made to a document is a difficult task if changes weren’t tracked during the editing process. Comparing the new document with its original version is the easiest way to pinpoint every single change that was made. To compare two versions of the same document, convert them to PDF in Nitro Pro and use the Compare tool to identify any differences in text, images, and even annotations.

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.

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.

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

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.

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.

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.