Presentations are the format that converts to PDF most cleanly, and the reason is worth understanding — it explains both why the result is usually faithful and precisely where it is not: text that moves, slides that do not fill the page, and media that stops playing.
Slides do not reflow
A word processor document is a flow. Text runs through a column, wrapping where it must, and the wrapping depends on font metrics, hyphenation rules and line-breaking decisions. Change any of those slightly and every line after the change moves. That is why documents shift when they move between applications.
A slide is a canvas. Each text box, image and shape sits at fixed coordinates on a fixed-size stage. There is no flow to recompute.
So a converter reproduces the layout by drawing each shape where the file says it belongs. PowerPoint to PDF renders one PDF page per slide, placing the shapes it draws where the file says, with tables and the colours the slide itself sets on text and shapes, because positioned shapes translate directly into positioned drawing operations. It does not draw slide backgrounds or the template’s own artwork yet: every page is white, so text set in white can disappear.
Why text and shapes move when a deck becomes a PDF
Shape positions are stored as fixed coordinates, so a converter that reads them puts every box back where it was. When something looks shifted in the PDF, check these four causes.
The font was substituted
If a heading was set in a typeface that is not installed where the PDF is made, a substitute is drawn instead. Substitutes have different letter widths, so a line that just fitted may now wrap, a two-line title becomes three, and text is pushed past the bottom of its box. Centred and right-aligned lines shift sideways for the same reason. A PDF that does not embed a font can also look different on a device without it, but its line breaks are fixed in the file and do not move.
Filozy’s PowerPoint to PDF always substitutes: it sets text in Helvetica, whatever typeface the deck uses (characters Helvetica cannot encode are drawn with the device’s own fonts, as small images), and wraps each line to the width of its box. Text that no longer fits is not cut off; it runs on below the box. Expect line breaks to differ from PowerPoint. When the typeface has to match exactly, export from the presentation application itself. The converter also draws rotated text boxes upright and leaves charts out rather than redrawing them, and names both in the result notes. It also draws filled shapes as rectangles and leaves connector lines out, which the notes do not mention.
Three practical defences:
- Prefer widely available typefaces for anything you know will be converted.
- Leave slack in text boxes. A title filling its box to the last pixel is one substitution away from overflowing. A little breathing room absorbs the difference.
- Embed the fonts when another computer will make the PDF. As of October 2026, Microsoft’s help on embedding fonts gives File > Options > Save, then Embed fonts in the file under Preserve fidelity when sharing this presentation, in PowerPoint for Windows. That helps PowerPoint on the other computer; Filozy’s converter ignores embedded fonts and sets text in Helvetica, as described above.
Text was shrunk to fit
When PowerPoint shrinks text to keep it inside a box, it saves the reduced size in the file as a percentage of the original. A converter that ignores that percentage draws the text at full size, and it overflows. Filozy’s converter applies the saved font percentage, but not the line-spacing reduction PowerPoint saves alongside it, and its letters are Helvetica rather than the original face, so shrunken text can still break at different points and run below its box. Tight, auto-shrunk boxes are the first place to look.
An animation had moved it
Animations are stored apart from the shapes, in the slide’s timing information, and a PDF page has no timeline to play them on. A conversion that draws the slide shows each object at the position saved with it — where it sits in the editor. An object on a motion path therefore appears at its place on the slide, not where the slideshow leaves it. Filozy’s converter does not read the animation data at all.
The slide was scaled onto a different page
If the PDF page is not the slide’s shape, the whole slide is shrunk to fit it, so everything looks smaller and sits away from the page edges. That is the next section.
Why the PDF doesn’t fit your slides to the page
Because the slide and the page are different shapes. A widescreen 16:9 slide is 13.33 × 7.5 inches. A4 and Letter have different proportions even turned landscape, so when a slide lands on a paper-sized page it is scaled down to fit and gains blank bands, at the top and bottom or down the sides. As of September 2026, Microsoft’s help on slide size notes that a Widescreen slide won’t fit on an 8.5 × 11 inch sheet without being scaled down.
A PDF made through a Print dialog, such as Microsoft Print to PDF, is laid out on the paper size chosen in that dialog rather than on the slide. Four ways to fix it:
Export instead of printing. As of October 2026, Microsoft’s help on saving a presentation as a PDF gives File > Export > Create PDF/XPS Document in PowerPoint for Windows, File > Save As or File > Export with the File Format set to PDF on a Mac, and File > Export > Download as PDF in PowerPoint for the web. In the Windows export’s Options, leave Publish what on Slides; Handouts puts several slides on each page, as described below.
Let the page be the slide. Filozy’s PowerPoint to PDF has no paper-size setting: each page is exactly the slide size stored in the file, so every slide fills its page edge to edge, and the result notes give that size in points. The trade-off is that anything hanging off the edge of the slide in the editor is cut at the edge of the page.
Make the slide the shape of the paper, before converting. Do this on a copy, because the content gets rescaled. As of September 2026, each vendor’s own help gives these settings:
- PowerPoint: Microsoft’s help gives Design > Slide Size > Custom Slide Size for Windows and the web (Page Setup in place of Custom Slide Size on a Mac), where the Slides sized for list includes Letter Paper and A4 Paper. Those presets are smaller than the sheets they are named for — Microsoft’s table gives 10 × 7.5 inches for Letter Paper and 10.833 × 7.5 inches for A4 Paper — so for an exact match, enter the paper’s own width and height. If PowerPoint cannot scale the content automatically, it asks whether to Maximize, which enlarges content when scaling to a larger slide, or Ensure Fit, which shrinks it when scaling to a smaller one; on a Mac, Microsoft’s help describes a Scale option instead.
- Keynote: Apple’s help points to the Slide Size pop-up menu in the Document sidebar.
- Google Slides: Google’s help gives File > Page setup, with Standard (4:3), Widescreen (16:9), Widescreen (16:10) and Custom.
Put several slides on each sheet. Keep the slides as they are and use Create PDF booklet to place two or four on each sheet, which uses the paper far better than one wide slide stranded in the middle of a portrait page, and produces a handout people can annotate. PowerPoint for Windows can do something similar in its own PDF export: as of September 2026, Microsoft’s help lists Handouts under Publish what, with a Slides per page setting.
Animation is not played, and usually that is correct
Everything time-based disappears, because a PDF page cannot animate the objects on it. The slide converts as it sits in the editor, with every object present.
A four-step bullet build becomes one page showing all four bullets. Transitions vanish. Timed reveals are simply present.
For a handout this is exactly right — the reader wants the finished slide, not to page through a reconstruction of the build.
The case to check is a slide animated so one element replaces another: a “before” panel replaced by an “after” panel in the same position. Flattened, both are drawn and one covers the other, so the hidden one is gone from the handout. If your deck uses that technique, split those slides into two before converting. Keynote has a built-in alternative: as of September 2026, Apple’s help lists a Print each stage of builds option in its PDF export, which puts each build on its own page.
Audio and video become a still picture
A PDF of a slide deck does not keep audio or video as something that plays. In a .pptx file, a video or sound clip is attached to a picture on the slide, and playing it is an instruction in the slide’s timing, which a PDF page does not have. So a conversion that draws the slide keeps the picture and not the playback: for a video, the image shown in its frame on the slide; for a sound clip, the icon or image that stands in for it.
Filozy’s PowerPoint to PDF draws that picture like any other image when it is a PNG or JPEG, and leaves it out otherwise, counting it in the result notes among images in a format PDF cannot embed. It never copies the media file into the PDF, so the PDF contains no playable clip and no link to one — and the recording’s size does not end up in the PDF.
If the audience needs the recording:
- Send the media file alongside the PDF, or share the .pptx itself.
- Turn the deck into a video instead. As of September 2026, Microsoft’s help gives File > Export > Create a Video in PowerPoint for Windows, saving as MPEG-4 or Windows Media Video, and Apple’s Keynote help lists Movie among the File > Export To formats.
Speaker notes live somewhere else
Notes are stored separately from the slide content. A slides-to-PDF conversion renders slides, so the notes are not in the output.
This is usually a relief — notes frequently contain things not meant for the audience. When you do want them, export a notes layout from the presentation application itself, which composes each slide above its notes onto a page. That is a different export, not a different conversion setting.
Worth a deliberate check before sending a deck externally. Notes have a long history of containing internal commentary, and the moment to find that out is before distribution rather than after.
Size, and what drives it
Decks are image-heavy, so converted files get large. A forty-slide deck with a photograph on every slide easily exceeds twenty megabytes.
The images are the cause; the slides are not. Compress PDF is the right response, and the trade-off deserves thought: a deck read on screen tolerates aggressive compression well, while one projected at scale does not — projection magnifies compression artefacts that are invisible on a laptop.
Compress for how it will actually be viewed.
What else does not survive
- Embedded video and audio — the picture standing in for them, not the playback; see above
- Hyperlinks — it depends on the tool. As of September 2026, Microsoft’s help says PowerPoint for macOS doesn’t preserve hyperlinks in PDFs, while PDFs made in PowerPoint for the web do. Filozy’s converter keeps the link text but not the link.
- Charts — Filozy’s converter leaves them out and names them in the result notes; export from the presentation application if a chart matters
- Backgrounds and template artwork — Filozy’s converter draws every slide on white and leaves out anything that sits on the layout or master, such as logos, coloured bands and fixed footer text, as well as bullets the template supplies. The result notes do not say so.
- Slide numbers — preserved if drawn on the slide, since they are shape content like anything else
- Hidden slides — normally excluded; Filozy’s converter leaves them out and says how many, while the PDF export options in PowerPoint for Windows, per Microsoft’s help as of September 2026, can include them. Confirm if you relied on one being there
- Comments — not part of the slide
Before you send it
- Check every heading for substituted fonts and overflow — the most likely visible defect.
- Look at any slide with a dark background or white text, because Filozy’s converter draws every background white.
- Look at any slide with layered animation to confirm nothing important is hidden underneath.
- Look at any slide that had a video or sound clip, and send the clip separately if it matters.
- Confirm the slide count matches, which catches hidden slides being included or excluded unexpectedly.
- Open one image-heavy slide at full size if you compressed, before deciding the setting was acceptable.
- Confirm the notes are not in there, if the deck is going outside your organisation.
The deck stays on your device throughout the conversion — which matters for an unreleased product deck or a board presentation rather more than for most documents.