Be careful with sending PowerPoint presentations that could have left overs of confidential information hidden inside that you do not want outsiders to see:

  • Comments in the speaker notes field at the bottom of the slides ("Let's don't tell our investors yet, about the disappointing Q1 results, we will do that in 2 weeks"). When you use an old presentation to "copy-save" it as the master of a new one, comments get copied across as well. 
  • Regular comments on slides that have not been removed
  • Information, comments, analysis, that sits in the Excel engine of data charts, when someone clicks "edit data", the full Excel sheet opens
  • Also, even if you remove the data labels or axes from a data chart, the data still remains visible when hovering over it with a mouse.

It is best to share your presentation as a PDF file, but even then watch out with information that becomes visible when hovering over with your mouse (data points, file names of images, etc.)

Image via WikiPedia

If you liked this post, why not subscribe to daily updates about presentation design via email? Just blog posts, no spam, or you can follow Jan on Twitter to never miss a thing.