If you want more text highlighting capabilities, someone has created an AHK script called Sumatra highlight helper that promises to be more stable (especially in cancelling highlights) and offer more tricks like finding the next highlighted text in a book. You need to tweak Sumatra PDF's advanced options to set SaveIntoDocument=false (more details here), which will create a sidecar file next to the original PDF document. I prefer to store the marked text in a separate file without touching the original PDF book.
To keep the highlights you must Save the PDF document pressing keys. Press A key (for Annotate) to flip highlighting on/off. 
As you read the PDF book, use your mouse to select the text to be highlighted. Not sure why this feature is stuck in test mode for a couple of years now, but one day it may find its way to the stable version. Here are step-by-step instructions to highlight PDFs with SumatraPDF: The other day I read about a hidden text "annotation" feature available in a prerelease (test) version, and it works nicely to highlight PDF document text as such: My favorite PDF reader of late is Sumatra PDF, a lightweight PDF and ebook reader that doesn't even need installation. Adobe Reader DC (even Edge browser can do it) but as we've seen Adobe reader is rubbish in terms of shell integration and working with xplorer², plus it is slow and resource hungry. There are many PDF reader tools that add text highlighting capabilities, e.g. But what about academic books? Electronic versions of scientific or computer books are convenient (you can easily search in them), but you still miss out underlining and highlighting paragraphs, scribbling explanations, annotations and other such hard-copy operations that help you revise a book. When it comes to timewasting books like novels you read on holidays, e-books are preferable. 
There are two kinds of people in the world, those that prefer traditional printed books, and those that go for electronic versions thereof (e-books, PDF documents etc). ■ Annotate PDF books using Sumatra PDF reader
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