If you want to make your presentation non-modifiable, you save it to *.pdf format or *.ppsx format
(PowerPoint Show format - see Automatically show your
presentation). However, if you want to publish the presentation on your personal or corporate Web
site, the better option is to export slides as separate pictures.
Instead of opening your PowerPoint presentation file and then clicking F5 or using other ways to start the
presentation, you can save your PowerPoint file in the PowerPoint Show format. Also, this format prevents
changes in the presentation.