Hi there,

RadClientExplorer manager actually handles page resizing since it exports the visible part of the page.

Take for example this sample where the div which we are about to export to PDF has width of 100%:

<div id="foo" style="width:100%;border: 1px solid red;">Lorem ipsum dolor sit amet</div>

<telerik:RadClientExportManager runat="server" ID="RadClientExportManager1">
    <PdfSettings FileName="Myfile.pdf" />
</telerik:RadClientExportManager>
<input type="button" onclick="exportElement()" value="export" />

<script type="text/javascript">
    function exportElement() {
        var exp = $find("<%= RadClientExportManager1.ClientID %>");
        exp.exportPDF($telerik.$("#foo"));
    }
</script>

If we resize the page and narrow its width, the div width will be also reduced and the reduced width will be exported too.

After that if we resize the page to full screen and export the div you'll see that its size changes too in the exported pdf file.

And that's not all, you can further customize the exported contents prior the export with the help of the .k-pdf-export class. You can find an example at https://docs.telerik.com/devtools/aspnet-ajax/controls/clientexportmanager/how-to/change-the-exported-content-before-export. This class will allow you to change the dimension of the div as you wish prior the export.

Regards,
Rumen
Progress Telerik