You can easily Export it as a PDF and send it to anyone.

You can also use the Publish Online feature (under the File menu command or the button in the top bar) to show your InDesign layout. It will yield a link you can email or hand out in any other way to anyone who wants to view it on any device. You can even set an option to let viewers download the PDF, if they'd want to.

Oorspronkelijk geplaatst op Quora: Is there a way to preview InDesign documents on a website on mobile?"