

The redact feature was designed to let you delete sensitive information from a text. From the Markup Toolbar, select the Redact button (see purple arrow below). (Hold down the Command key to select multiple pages.) Go to Edit > Delete or click the delete button on your keyboard. Click on the thumbnail of the page you would like to delete. You will see thumbnails of each page in the PDF. In Preview, go to the View menu and select Show Markup Toolbar. From the toolbar, click Sidebar to open the sidebar drawer. If you haven’t flattened your PDF, the recipient can. Flattening basically means integrating added elements into the PDF so they became part of it. If you are using the Preview app, for instance, you need to flatten the PDF document after adding the boxes. If you need to remove text from a document from a PDF before sending it-and you can’t simply eliminate information in the source document used to create the PDF and make a fresh one-you can turn to several apps to snip secret, legally prohibited, embarrassing, or proprietary text out of a PDF before sending it on its way. Right-click on the PDF, and open it in Preview. Unfortunately, these ways of redacting PDF documents are not in themselves secure. Three notable incidents: the accidental release of information in a filing in 2011 in long-running litigation between Apple and Samsung, the disclosure of key allegations in the Paul Manafort prosecution in 2019 alleging his connection to a purported Russian-connected associate-and on May 25, 2021, when information was revealed when CNN performed a copy and paste in filings by attorneys for a defendant in a case that involves former New York City mayor Rudolph Giuliani. These black-box overlays have led to embarrassing and legally disastrous situations stretching back a couple of decades.

While the text appears removed in places, a reader can select the range, copy it, and paste it into another document to read it in full.

Proper redaction can prevent embarrassing, proprietary, or secret information from leaking out, as in a court case involving an associate of Rudolph Giuliani.
