Chapter 10. Flattened PDFs Flattening is a process of applying all annotations, form data and markups to a PDF. No changes can be made to annotations or form data after the flattening. Flattened PDF files are used: When you need to apply all annotations to a PDF in order to prevent further modification To complete the form To apply a signature To remove all active elements like links, outlines and bookmarks To make annotations viewable on basic PDF readers
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