This sample will open an existing PDF document, reorganize pages by putting 4 pages of any size onto one single page in letter format (8.5 x 11) and save them as a new PDF document. The pages are organized sequentially in 2 columns and 2 rows, called a sequential imposition layout.

// Load document
PDFDocument srcDoc = new PDFDocument("C:/qoppa/test/in.pdf", null);
 
// Create new PDF for output
PDFDocument targetDoc = new PDFDocument();
 
PDFPage targetPage = null;
int rows = 2;
int cols = 2;
 
for (int i = 0; i < srcDoc.getPageCount(); i++)
{
 // Get source PDF page
 PDFPage srcPage = srcDoc.getPage(i);
 
 int index = i % (rows * cols);
 
 if (index == 0)
 {
   // Create a new target page
   targetPage = targetDoc.appendNewPage(8.5 * 72, 11 * 72);
 }
 
 // Calculate the transform to position the page
 double w = srcPage.getDisplayWidth() * cols;
 double h = srcPage.getDisplayHeight() * rows;
 
 double scale = Math.min(targetPage.getDisplayWidth() / w, targetPage.getDisplayHeight() / h);
 double tx = srcPage.getDisplayWidth() * scale * (index % cols);
 double ty = srcPage.getDisplayHeight() * scale * (index / cols);
 // Overlay PDF content for current source page
 targetPage.appendPageContent(srcPage, tx, ty, scale, scale, null);
}
 
// Save the output document
targetDoc.saveDocument("C:/qoppa/test/out.pdf");
Output PDF: 4 pages were added into a single page This is called the sequential imposition layout with 2 columns and 2 rows.

The sample code above can be changed to handle other imposition layouts (such as 2-Up booklet, 4-Up booklet, cut stack, or step and repeat). You can see all the different layouts and binding styles implemented in our end-user desktop PDF editor PDF Studio (look under Document > Imposition).