Redaction permanently removes parts of text or images from a PDF file, and replaces them with black rectangles. This lets you remove sensitive information from a paragraph, table, heading, or a bitmap image. The rest of the document is unaffected, and can be viewed and printed normally.
Redaction is a two-step process - mark areas for redaction, and then apply redactions:
Note: Redaction marks, images, and pages are removed permanently as soon as you apply redactions. Undo (Ctrl+2) cannot restore redacted content after you apply redactions.
Redactions are not saved to the PDF document until you save the PDF file. If you apply an unwanted redaction, close the file immediately without saving, and re-open it.
When you save a PDF file with redactions, you are advised to use a different file name, and indicate that redactions are applied. Nitro Proprompts you to append _redacted to the file name.
Redaction affects text and images on the content layer only. Therefore, if you want to remove an annotation or vector graphics, right-click it, and select Delete from the menu.
For more information, see Annotation layer and content layer.
Redaction does not remove metadata from your PDF document.
For more information, see Remove metadata.
Note: Redaction marks respect the order that text and images are stacked. All image and text under the redaction mark is redacted.
Example #1: If text is on top of an image, a redaction mark on the text also redacts the same area of the image under the marked text.
Example #2: If a background image on a page has text in front of it and the image is redacted, the text is unaffected. The redaction mark might be the same color as the text, but the text remains, and can be selected and copied.
Areas marked for redaction are shaded red by default. To preview how a redaction mark will appear after redaction is applied, hover your mouse cursor over the redaction mark. The selected area is covered by a black rectangle.
Tip: You can customize colors and other features of redaction marks and redactions by configuring Redaction Properties.
Tip: Repeat Marks Across Pages is useful for redacting unwanted headers and footers from every page.
To remove a redaction mark, use the Mark for Redaction, Hand or Select tool, and do one of the following:
To apply a redaction on an individual redaction mark:
To apply redactions to all marked areas:
Note: When you Save or Save As your PDF file after applying a redaction, Nitro Pro prompts you to append _redacted to the filename so the original PDF file is not overwritten.
To configure default redaction properties:
To customize redaction properties for a specific redaction mark:
To use properties (including redaction codes) of a selected redaction mark as the default for future redactions, right-click the redaction mark, and select Make Current Properties Default.
Redaction Codes indicate why content was redacted. Nitro Pro is pre-loaded with commonly used redaction codes, also known as exemption codes, which apply to the US FOIA (Freedom Of Information Act) and the US Privacy Act, for example, (b)1A.
Tip: You can specify default redaction codes to be associated with redaction marks when you create them. You can also customize redaction codes and define your own code sets of customized redaction codes.
Alternatively, you can specify custom text for a redaction mark.
To specify default redaction codes to associate with redaction marks:
Tip: To specify custom text instead of a redaction code from a code set, on the Overlay Appearance tab (step 4, above), select Custom Text and enter text to apply to the annotation.
To associate redaction codes with an existing redaction mark:
To customize code sets and redaction codes:
Note: Redaction code sets are stored in an XML file located here: %appdata%\Nitro\Pro\11.0\Redaction
Advanced users and IT administrators may prefer to modify this file directly.
Search and Redact searches for keywords or phrases, and lets you select matching expressions to mark for redaction.
Tip: You can click on matching search results to go to their location in the PDF document and preview the redaction mark as selected text.