How can I make sure that my customers my open PDFs in a certain percentage?

Hi Aron,

As per description, you want pdfs to open at specific zoom when sent to your customers, is that correct?

You may set the Initial view for a pdf using Adobe Acrobat. Below are some of the links which discuss this in more detail:

Can I lock in a zoom level (e.g. Page View) so it won't change?

Setting zoom level

Let us know if you have a further query.

Shivam