SumatraPDF is designed around opening and navigating documents rather than editing them. It can serve as a simple default reader for PDFs and ebooks, with a portable option for a self-contained document-reading setup.
Use SumatraPDF as a simple reader for downloaded documents and ebooks, then choose a separate editing tool when changes are needed. Set comfortable zoom and navigation shortcuts for long reading sessions. The portable version is useful when you want a self-contained reader alongside documents.
