Metadata hiding in your conference slides
You finish a deck, export it, and upload it to the conference's slide portal or your company's public resources page. What you might not check: the .pptx file underneath is a bundle of XML parts, and several of them carry information you never meant to publish.
What's actually in a slide deck
- Author & company name — set once, often years ago, and never updated since.
- Edit history — total edit time, last modified by, and sometimes the names of everyone who touched the file.
- Speaker notes — the blunt, unfiltered version of your talk that lives in the notes pane, easy to forget is still in the export.
- Deleted or hidden slides — a slide you removed from the show but that can still linger in the file depending on how it was edited.
- Embedded comments — a colleague's "cut this slide, it's wrong" note, still attached.
None of this shows up when you're clicking through the presentation. It shows up when someone opens the raw file — and conference slide portals hand out the raw file.
Why it's worth a second look
A leaked author field is usually harmless. Speaker notes with a client name in them, or a comment thread arguing about a number on a slide, are not. If your deck touches unreleased product plans, financials, or anything under NDA, the notes pane and comment history are exactly where that kind of detail tends to hide in plain sight — invisible in Present mode, fully readable in the file.
Office files: check first, don't assume "export" cleans it
Exporting to PDF or re-saving doesn't reliably strip this. Track Changes being off doesn't mean the history is gone.
scrub reads .pptx, .docx and PDF files on your device — nothing is uploaded — and shows you a plain list of what's inside: author and edit metadata, speaker notes, comments, and any hidden or invisible text. For Office and PDF files, scrub is scan-only today — it tells you exactly what's there so you can go remove the sensitive parts yourself (Inspect Document in PowerPoint, or manually clearing notes and comments) before you upload. Image files (screenshots dropped into a deck, exported title slides) it can clean directly.
The short version
A presentation file carries more than the slides you see — author info, speaker notes, and comment threads ride along in the export. Scan the file before it goes on a conference portal. Get scrub free and check a deck before you upload it.