How this converter actually works
Most “PowerPoint to PDF” websites are a thin front-end over a server running LibreOffice or Office: you upload the file, their machine renders it, and you download the result. That is fine for a public flyer and a genuine privacy problem for a board deck, an unreleased roadmap, or anything with customer data on a slide.
This tool takes the other path. A .pptx file is really a ZIP archive of XML, and modern browsers can open it. The converter unzips your deck in the page, reads each slide’s shapes — text runs with their fonts and colours, images, tables, backgrounds — and re-draws them at the right coordinates, then captures each finished slide as one page of a PDF. Your file is opened, read, and rendered without a single network request carrying its contents.
What survives the round trip, and what doesn’t
The everyday building blocks of a business deck come through faithfully: titles and body text at their real sizes, weights, colours and alignment; bulleted lists; photographs and logos; tables; and solid slide backgrounds. The page size is read from the presentation, so a 16:9 deck produces 16:9 pages and a 4:3 deck produces 4:3 pages — no cropping, no black bars.
Two categories are honest exceptions. Charts and SmartArt are stored as live, editable objects rather than pictures; a browser cannot reproduce them pixel-for-pixel, so those regions are skipped. If a slide depends on a chart, the quickest fix is to right-click it in PowerPoint, choose Save as Picture, and paste it back as an image before converting — images render perfectly. Animations and transitions simply have no meaning in a static document. Everything a printed handout would show, the PDF shows.
Choosing Compact or High
The quality switch trades file size against sharpness. Compact renders slides as JPEG at 2× and is the right default for emailing a deck or attaching it to a ticket. High renders as PNG at 2.5×, which keeps small text crisp when the PDF will be printed at full size or projected. When the PDF is ready you can shrink it further with the PDF compressor, merge it into a larger document, or stamp a watermark on every page.