What a deck is, to a computer
A .pptx is a zip of XML, which is why it can be opened in a browser at all. Inside, each slide is a tree of shapes, and each shape may carry a text body of paragraphs and runs. That text — the titles, the bullets, their outline levels — is fully readable.
Everything else about a slide is described in DrawingML: the theme, the master layout, shape geometry and position, fills, gradients, effects, images, charts, SmartArt. That is a vector layout language, and drawing it correctly means implementing a presentation engine.
So this tool takes the honest half
It extracts what the deck says and lays it out as a document: the slide title as a heading, the body as bullets with their nesting preserved, one slide per page, optionally with the speaker notes underneath.
That is a genuinely useful artefact — it reads well, prints well, searches well and can be quoted from. It is not a picture of your slides, and the tool does not pretend otherwise. For that, PowerPoint's own Export to PDF is better than anything a browser could manage.
Speaker notes
Notes are stored in separate documents alongside the slides, and they are frequently where the actual content lives — the script, the caveats, the numbers behind the chart. Turning them on appends each slide's notes under its bullets, set apart with a rule.
The notes document repeats the slide's own text in a placeholder, so only the genuine note body is taken; you do not get everything twice.
Slide order
Order comes from the presentation's slide list, resolved through the package's relationship file. This matters more than it sounds: reading the slide files in name order puts slide10 between slide1 and slide2, and a deck reordered after creation has filenames that no longer match its sequence at all.
Common uses
- Reading a deck on a device without PowerPoint
- Printing a text handout instead of forty pages of slides
- Pulling the speaker notes out of a presentation
- Quoting or searching a deck's content
- Turning slides into the starting point for a written document
Privacy
The deck is unzipped and read inside your browser, and the PDF is built in memory. Nothing is uploaded — which matters for the internal decks that make up most of what anyone converts.