How to Merge or Split PDFs
Merging multiple PDF files into one can be highly useful in various scenarios. For instance, you can consolidate similar documents such as resumes into a single file instead of sharing multiple files. This article guides you through the process of merging multiple PDF files using C#. IronPDF simplifies PDF splitting and merging with intuitive method calls within your C# application. Below, we'll walk you through all the page manipulation functionalities.
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How to Merge and Split PDF Pages in C#
- Download IronPDF library for PDF document manipulation
- Load existing or create a PDF from HTML string, file or URL
- Merge two PDF files in C# with
Mergemethod - Split a PDF file by pages utilizing the
CopyPageandCopyPagesmethods - Save the PDF document to desired location
Merge PDFs Example
In the following demonstration, we will initialize two two-paged HTML strings, render them as separate PDFs with IronPDF, and then merge them:
:path=/static-assets/pdf/content-code-examples/how-to/merge-or-split-pdfs-merge.csusing IronPdf;
// Two paged PDF
const string html_a =
@"<p> [PDF_A] </p>
<p> [PDF_A] 1st Page </p>
<div style = 'page-break-after: always;' ></div>
<p> [PDF_A] 2nd Page</p>";
// Two paged PDF
const string html_b =
@"<p> [PDF_B] </p>
<p> [PDF_B] 1st Page </p>
<div style = 'page-break-after: always;' ></div>
<p> [PDF_B] 2nd Page</p>";
var renderer = new ChromePdfRenderer();
var pdfdoc_a = renderer.RenderHtmlAsPdf(html_a);
var pdfdoc_b = renderer.RenderHtmlAsPdf(html_b);
// Four paged PDF
var merged = PdfDocument.Merge(pdfdoc_a, pdfdoc_b);
merged.SaveAs("Merged.pdf");Result
This is the file that the code produced:
Combine PDF Pages
Use the CombinePages method to combine multiple PDF pages into a single page. The method requires the width, height, number of rows, and number of columns.
:path=/static-assets/pdf/content-code-examples/how-to/merge-or-split-pdfs-combine.csusing IronPdf;
PdfDocument pdf = PdfDocument.FromFile("Merged.pdf");
// New wdith and heights are in millimeters
PdfDocument combinedPages = pdf.CombinePages(250, 250, 2, 2);
combinedPages.SaveAs("combinePages.pdf");Result
Split PDF Example
In the following demonstration, we will split the multi-page PDF document from the previous example.
:path=/static-assets/pdf/content-code-examples/how-to/merge-or-split-pdfs-split.csusing IronPdf;
// We will use the 4-page PDF from the Merge example above:
var pdf = PdfDocument.FromFile("Merged.pdf");
// Takes only the first page into a new PDF
var page1doc = pdf.CopyPage(0);
page1doc.SaveAs("Page1Only.pdf");
// Take the pages 2 & 3 (Note: index starts at 0)
var page23doc = pdf.CopyPages(1, 2);
page23doc.SaveAs("Pages2to3.pdf");So this code saves two files:
- Page1Only.pdf (Only the first page)
- Pages2to3.pdf (Second to Third page)
Results
These are the two files produced:
Page1Only.pdf
Pages2to3.pdf
