pdf.paperSize String|Array (default: "auto")

Specifies the paper size of the PDF document. The default "auto" means paper size is determined by content.

The size of the content in pixels will match the size of the output in points (1 pixel = 1/72 inch).

Supported values:

• A predefined size: "A4", "A3" etc
• An array of two numbers specifying the width and height in points (1pt = 1/72in)
• An array of two strings specifying the width and height in units. Supported units are "mm", "cm", "in" and "pt".

Example - set custom paper size

<div id="grid"></div>
<script>
$("#grid").kendoGrid({
    toolbar: ["pdf"],
    pdf: {
        paperSize: ["20mm", "20mm"]
    },
    dataSource: {
        transport: {
            read: {
                url: "https://demos.telerik.com/kendo-ui/service/products",
                dataType: "jsonp"
            }
        },
        pageSize: 10
    },
    pageable: true
});
</script>

As of Q2 2016, when paperSize is specified the Grid will use drawDOM's automatic page breaking algorithm. This makes available a few new options: template, repeatHeaders and scale.