Share a deck as a PDF that opens on any device, keeps the layout, and cannot be quietly edited by the recipient.
A .pptx depends on fonts, on the PowerPoint version and on whether the recipient's machine has the same theme. A PDF shows the slides exactly as designed, on a phone, a tablet or a projector computer — which is why conferences and clients usually ask for one.
Look at the pages where you used unusual fonts, embedded video and animation. Video and transitions do not survive a PDF — a slide that relied on a clip becomes a still frame, so add a note or a link if the motion carried meaning.
If the deck has speaker notes and you are sending it as reading material, export the notes version from PowerPoint first; a straight PDF conversion gives the slides only.
No. A PDF is static: transitions become plain slides.
No — that is usually the point. Keep the .pptx if you need to keep working on it.
Yes, by saving those slides as a separate presentation first.