We're not sure we understand your inquiry and our suspicion from the provided information so far is that you probably do not consider the differences between logical (HTML Preview and web report viewer) and page oriented formats (Preview and PDF format).
The output of a report rendered in HTML and PDF differs because both medias are quite different. The 1st (HTML) is dedicated to displaying information on screen and the page is infinite by width and height; in contrast the 2nd format - PDF - supports physical pages and is meant not only for reading on screen but for printing.
According to whether the format supports physical pages, we separate the export formats on two groups: page-oriented (PDF, Image (print preview), print, XPS, RTF) and non-page oriented (HTML/MHTML, Excel, CSV).
For the page-oriented formats the content layout is on horizontal and vertical pages according the the page settings of the report, while for the rest of the formats take into considerations other characteristics of the media like the grid of the Excel worksheet.
For detailed information about specific rendering extension/format please refer to Design Considerations for Report Rendering
help section in our documentation.
All the best,
the Telerik team
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