DokMine
PowerPoint redaction

Redact a PowerPoint deck, notes and all

The slide is the part everyone checks. The speaker notes, the object dragged off the canvas and the screenshot on slide 14 are the parts that leak. DokMine covers all of them and returns a .pptx.

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Decks leak off the slide

A deck gets reviewed by looking at it in presentation mode, which shows you a strict subset of what is in the file. The rest travels with it:

  • Speaker notes. The most reliable place to find a customer name, an internal comment or a phone number in an otherwise sanitised deck.
  • Objects dragged off the canvas. Not visible when presenting, fully present in the file, and a favourite parking spot for the earlier version of a slide.
  • Hidden slides. Skipped in the show, included in the file.
  • Slide masters and layouts. Placeholder text left over from the template the deck was built from.
  • Embedded screenshots. A pasted picture of a dashboard, an inbox or a spreadsheet, carrying names and email addresses as pixels.
  • Presentation properties. Author and company fields.

What DokMine does

The presentation XML is edited directly and a valid .pptx is returned: layouts, animations, theme, fonts and slide structure intact. Text is removed rather than covered with a shape, so it cannot be recovered by moving a rectangle aside. Images on slides are read with OCR and matches are blacked out in the image data itself.

Choose blackout for a clean visual result, or typed tokens ([NAME_1], [EMAIL_1]) when the deck needs to stay legible as a narrative — useful for turning a real client case study into an anonymised one without rewriting it by hand.

How to do it

  1. Upload the .pptx.
  2. Select the entity types you care about.
  3. Run extraction to see what is in the deck, itemised by type — this is usually the moment the speaker notes turn out to contain something.
  4. Redact, download, then open the deck and check the notes pane and any hidden slides.

Limits

Text baked into a low-resolution screenshot may not OCR cleanly, and names remain the least reliable detector in any format. Charts sourced from an embedded workbook can carry data beyond what the chart displays. DokMine flags images it could not read rather than passing them off as checked, but it does not guarantee complete detection or removal — review the returned deck yourself before you present or send it.

Questions

Does it redact speaker notes as well as slide text?

Yes. Speaker notes are processed alongside the slide content, which matters because they are the most common place for personal data to survive a visual review of a deck.

Do I get a .pptx back?

Yes. The presentation XML is edited in place, so layouts, theme, animations and slide structure are preserved and the deck opens normally in PowerPoint.

What about screenshots pasted into slides?

Images on slides are read with OCR and matches are blacked out in the image data. If an image cannot be read, that is reported rather than passed over silently.

Does it cover hidden slides and objects placed off the canvas?

Yes. Both are part of the file even though neither appears when presenting, so both are processed.

Can I anonymise a client case study with this?

Token masking is designed for that: each distinct name or company maps to a consistent placeholder, so the deck still reads as a coherent story with the identities removed. Review the result before using it.

Other formats

The same engine, the same account — the hazards differ by format.

Redact a PDFTrue redaction, not a black rectangle Redact a Word documentTracked changes, comments and metadata Redact an Excel fileHidden sheets, formulas and pivot caches Redact scans & screenshotsOCR, with the pixels actually changed Extract emails & phone numbersList what is inside, per file and type

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