What the tool actually does. Every page is rasterized and processed like a photo frame: the page is rotated a fraction of a degree (each page gets its own angle, as with hand-fed sheets), fine sensor grain is added, brightness and contrast are boosted, and in black-and-white mode the document turns gray like a photocopy. The result is indistinguishable from a file out of an office MFP.
Three intensity levels cover different scenarios. 'Light' is a neat scan on a good scanner: barely visible skew, minimal grain. 'Medium' is a typical office photocopy and the most universal choice. 'Strong' is a worn-out copier with visible grain and contrast — for the look of a document copied many times. Color is configurable too: black-and-white mimics a copier, color mimics a flatbed scanner.
Two limitations to keep in mind. First, as with a real scan, text stops being selectable — pages become images; that is part of the effect. Second, the file grows to real-scan size (comparable to scanning at 150 DPI). And a legal note: the tool does not replace actual signing — it only gives an already-signed document the familiar 'paper' look that archives and correspondence ask for.