| Type | Description | Common Use | |------|-------------|-------------| | | Text set to 0% opacity or white-on-white | Hidden notes, watermarking | | Hidden layers | PDF layers (OCGs) that are turned off by default | Technical drawings, alternate languages | | Metadata invisibility | Hidden author names, edit logs, embedded files | Forensics, privacy | | Steganography | Data hidden within images or fonts | Covert communication, digital watermarking | | Invisible signatures | Digital signatures not visually apparent | Legal validation |
A satirical and erotic narrative that follows the exploits of a libertine character. In the 18th century, such works were often suppressed by the Inquisition and survived only through private manuscripts or illegal prints. ellibertinoinvisiblepdf top
Many PDF parsers strip zero-width characters during copy-paste. | Type | Description | Common Use |
"Invisible PDF" sometimes refers to:
These elements make legibility contingent, turning reading into an embodied, social act. "Invisible PDF" sometimes refers to: These elements make
: The situations are often absurd and comedic, following the tradition of the Spanish picaresque novel (like Lazarillo de Tormes ).