Merge two document pages into a new single page

Updated on Apr 27, 2026

Product Version	Product	Author
2021.2.614	RadPdfProcessing	Martin Velikov

Description

This article describes how to import two PDF documents and merge their first pages into a new single page.

Solution

The following example demonstrates how to use the PdfStreamWriter in order to import and merge the first pages of two different documents into a new single page.

Example

csharp

	string firstDocument = "SampleDocument1.pdf";
	string secondDocument = "SampleDocument2.pdf";

	string exportedPdf = "Merged.pdf";
	if (File.Exists(exportedPdf))
	{
		File.Delete(exportedPdf);
	}

	using (FileStream fileStream = File.OpenWrite(exportedPdf))
	{
		using (PdfStreamWriter fileWriter = new PdfStreamWriter(fileStream))
		{
			using (PdfFileSource firstDocumentToMerge = new PdfFileSource(File.OpenRead(firstDocument)))
			using (PdfFileSource secondDocumentToMerge = new PdfFileSource(File.OpenRead(secondDocument)))
			{
				PdfPageSource firstDocumentPageToMerge = firstDocumentToMerge.Pages[0];
				PdfPageSource secondDocumentPageToMerge = secondDocumentToMerge.Pages[0];

				double largestPageHeight = Math.Max(firstDocumentPageToMerge.Size.Height, secondDocumentPageToMerge.Size.Height);
				Size size = new Size(firstDocumentPageToMerge.Size.Width + secondDocumentPageToMerge.Size.Width, largestPageHeight);

				using (PdfPageStreamWriter newPage = fileWriter.BeginPage(size))
				{
					newPage.WriteContent(firstDocumentPageToMerge);

					double offsetX = newPage.PageSize.Width / 2;
					newPage.ContentPosition.Translate(offsetX, 0);
					newPage.WriteContent(secondDocumentPageToMerge);
				}
			}
		}
	}

More information you can find in the PdfPageStreamWriter, PdfFileSource, and PdfPageSource help articles.