PowerPoint to PDF

A slide and a page measure differently, and that is where most surprises come from. A modern 16:9 deck is 13.33 by 7.5 inches, 33.87 by 19.05 cm; an older 4:3 deck is 10 by 7.5. None of those is A4. The conversion keeps the size you authored, one PDF page per slide, so the result matches your design exactly and then refuses to fill an A4 sheet when you print it. Ask the print dialog to fit to page, or set the slide size in PowerPoint before converting if the handout has to be A4. Rendering is done by LibreOffice Impress in headless mode, which explains the second surprise: fonts. If a typeface is not installed on the converter, a substitute is used, and substitutes have different letter widths. Calibri becomes Carlito and Cambria becomes Caladea, which are metric-compatible and land in the same place; something rarer will reflow a title onto two lines. Sticking to Arial, Times New Roman, Calibri or Verdana, or embedding the fonts in the .pptx, keeps the layout intact. The third thing to expect is that animation disappears, and not by hiding. A PDF page holds one state, so everything placed on a slide is drawn, including the four bullets that were meant to arrive one click at a time and the box that was supposed to slide in over them. A build that overlaps looks like a pile in the PDF. If a slide depends on its animation, split it into several slides before converting. Vector content stays vector: SmartArt, charts and shapes remain sharp at any zoom instead of turning into screenshots, and text stays selectable and searchable in the PDF. Photographs keep their resolution, which is why a heavy deck produces a heavy PDF. Accepted inputs are .pptx and .ppt up to 100 MB, uploaded for conversion and deleted within the hour by a purge that runs every fifteen minutes.