That means background color, text size, and other stuff is usually unspecified, and therefore up to the app displaying it. The Accessibility feature Black on White in Settings > General > Accessibility will do this in a more colorful way for the entire iPad display.Īn ePub or most other ebook formats are just a collection of text and files with tags to suggest layout. It converts to grayscale and then inverts the image so that the text is white on a black background. PDF Expert does have a Night display mode. You'd need a PDF editor to change something like the background color. Most PDF readers, all that I know, are concerned with an accurate representation of the file. Click on 'Save' and once more on the 'Save' button to receive your edited PDF. by opening the 'Options' menu on the left. Change the color, font, stroke size, etc. It is in the nature of a PDF file to contain all the necessary information to print, and because of this things like background color are embedded in the file. You can zoom in and out on the page using the magnifying glasses buttons, undo changes, reset the whole page, and so on. I don't know of any PDF reader that will let you do this. You can't change the background color of a PDF in iBooks.

Change pdf background color