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PDFTron SDK allows you to crop pages to your required size parameters.
To crop a page in a PDF document.
PDFDoc doc = new PDFDoc(filename); // Access a PDF page Page page = doc.GetPage(page_num); // Crop the page page.SetCropBox(new Rect(0, 0, 500, 600));
The crop box defines the region to which the contents of the page are to be clipped (cropped) when displayed or printed. Unlike other types of boxes, the crop box has no defined meaning in terms of physical page geometry or intended use; it merely imposes clipping on the page contents. The default value is the page's media box. A new crop box can be imposed on a page with
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