It’s pretty easy to make a Google presentation that your users can download as an eBook to use with their favourite eBook reader.
The key thing to remember is that most eBook readers are happiest in portrait, rather than landscape, format. Since Google Slides normally makes slides in landscape layout (to suit a monitor or projector) we need to alter this.
Start by going to File > Page setup … in your presentation:
Here you’ll see listed the popular landscape formats. To create a portrait format, I’m going to choose Custom instead:
I’m now going to enter 21cm as a width and 29.7cm as a height; these are the dimensions of an A4 page. Of course, the eBook reader will scale these to suit its own screen size:
Now the blank pages have been resized to the correct format, I can go ahead and create my presentation in the normal manner:
There are any number of different file formats for eBook readers, but nearly all readers can display PDF files. Save your presentation as a PDF file using File > Download as > PDF:
You can distribute the resulting PDF file to your users by any convenient means. Each slide in your presentation becomes a page in the resulting eBook. Here’s the example eBook being viewed on a Kindle Fire: