Even as a Book format it is klunky, as it has no indexing. Take the text to speech tools and the bigger the book the slower it gets near the end of the book.
I would rather have a plain ole html file with formatting flags than a PDF book.
I would rather have a plain ole html file with formatting flags than a PDF book.
If your pdf book does not have it, there's some readers who can add it. e.g. https://helpx.adobe.com/acrobat/using/creating-pdf-indexes.h...