What this preserves, and what it doesn't
Preserved: the text content of every slide, in the order the slides appear in your presentation — read directly from the .pptx file's internal structure, one PDF page per slide.
Not preserved: slide design, backgrounds, images, charts, fonts, colors, and precise text positioning — this produces a plain-text reading copy of your slide content, not a visual replica. Speaker notes aren't included either. If you need an exact visual copy, consider exporting to PDF directly from PowerPoint instead, or use PDF to PPT in the other direction, which preserves visual appearance via images.
related tools
Need to go the other way? Try PDF to PPT, or merge several PDFs with Merge PDF.