PDF to JPG

No. The PDF viewer runs inside this browser tab and draws each page onto a canvas there. Your document is never sent anywhere, so no server holds a copy of it, even briefly.

Screen is fine for reading on a phone or putting in a message. Good suits most uses, including slides. Print renders at 300 dpi, which is what a printer wants, and produces much bigger files — an A4 page is roughly 2,480 by 3,508 pixels.

JPG for scanned pages and anything photographic: much smaller files. PNG for pages that are mostly text, lines or diagrams, where it keeps edges sharp and avoids the smudges JPG leaves around letters.

Every page is drawn at full resolution on your own device, which is real work, especially at 300 dpi. Nothing is being uploaded while you wait — that is simply your browser rendering.