PowerPoint to PDF

Close for the usual deck: every slide becomes a page of the slide's own size, with its background colour or picture, its placeholders where the layout and the master put them, text in the size, weight, colour and alignment the deck set, bullets and numbering, line spacing and the shrink-to-fit the deck stored, pictures with their crops, rectangles, rounded rectangles, ellipses and lines with their fills and outlines, tables with their style's fills and rules, and rotated or flipped shapes turned as on the slide. The fonts are different: a browser can't read the fonts on your computer, so the text is set in embedded families of the same kind, squeezed to the width of the original - a long line may still wrap a word earlier or later. Nothing is uploaded; the conversion runs in your browser.

Charts, SmartArt and other embedded graphics (they are counted and reported), gradient and pattern fills beyond their first colour, shapes other than rectangles, ellipses and lines (their text is kept, their outline is not drawn), shadows and other effects, pictures in EMF, WMF or TIFF, speaker notes, animations and transitions. Hidden slides are skipped, as PowerPoint skips them when printing. A deck that leans on charts or SmartArt is better saved as PDF from PowerPoint itself.

Not directly - the old binary format needs PowerPoint to read it. Open it in PowerPoint (or LibreOffice Impress) and save it as .pptx, then drop that here.

Save the PDF here first, then run it through N-up for a handout with 2, 4 or 6 slides a page, or through Page numbers - both work on the file you just made, and nothing leaves your device at any step.