Merging two pages from different documents into a single page

Updated on Apr 24, 2026

Product Version	Product	Author
2021.2.615	RadPdfProcessing	Martin Velikov

Description

This article shows how to merge two pages from different documents into a single page.

Solution

The provided code snippet demonstrates how to import two PDF documents using the PdfFileSource, get their first pages using the PdfPageSource, and merge them on a single page using the PdfStreamWriter.

Merge two pages from different documents into a single page

csharp

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

	using (FileStream fileStream = File.OpenWrite(mergedPdf))
	{
		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);
				}
			}
		}
	}