Building TinyPDFViewer which a pdf viewer should do and Adobe never did - let me read PDF in peace (no fancy login / features) and yet protect my eyes. Its around 5.8 MB total (5.5 MB is pdfium DLL itself and my app is around 340 KB). It has reading mode which finally works, supports quick shortcuts I needed and its blazingly fast with low memory footprint. I have been slowly, but steadily over the past year building tiny apps replacing typical software on windows.