Easy on the Eyes
A bright white PDF is harsh to read in a dark room or late at night. Inverting the colours turns the page dark with light text β a built-in 'dark mode' for any document β which many people find more comfortable and less tiring for long reading sessions.
Every page is inverted, including images and diagrams, and reassembled into a new PDF you can read or print.
Converted in Your Browser
Each page is rendered and inverted on your device. Nothing is uploaded β the only network request is the one-time download of the rendering library.