Hi Frederic,
The file size is limited to your WP configuration; however, for best results we recommend that you compress your PDFs as much as possible to decrease the loading time. Services such as SmallPDF are particularly useful and this will save data and decrease the loading time for your users.
Like all JavaScript functionality, browser support will vary but it has good support by Chrome, Firefox, and Opera, with moderate support for most features in IE11/Edge and Safari 9+.
If you have any other questions, please feel free to drop us an email at contact@wp-pdf.com as we may not always pick up posts on these forums.
Emma
