Qpdf can change both text and background color but only in text-based pdf files - and that in a rather odd manner: only background/'paper' color can be set directly, the font color can only be 'inverted' from white to black: so, the trick is to set the direct color in such a way as to result in a desired color when inverted (see this answer, which provides an example of good setting for a proper dark mode result: Background color: #41403b, Paper color: #cccbca). Then, for easy access, configure toolbar and add Toggle change color. In newer versions of Okular (like 1.9.3) both font and page colors can be edited - and a dark-mode look can be enabled - through a new and rather non-intuitive setting, under Configure Okular - Accessibility - Color mode: Change Dark and Light Colors, by selecting a light color for dark and a dark one for light color option. Master PDF Editor More details in this answer, also PDF readers that can change both page and text color in both text and image (scanned text) pdf files are:

Simply inverting colors doesn't provide the best readability (being limited to very bright white text on very dark black background), although it can improve it a lot in a dark environment.Įvince and also pdfstudioviewer can do that, which will result in something like this (in both image and text pdfs):

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