This demo uses the New DevExpress PDF Document API (PdfDocument) to merge multiple PDFs into a single file. You can merge predefined sample files or supply your own documents. To do the latter, select Upload a File in the file selection drop-down menu and upload files one at a time.
Click the Merge Documents button to merge files and download the result.
Select a Document
Sample_Main.pdf
Sample_Alternative.pdf
using DevExpress.Docs.Pdf;
Stream MergeDocuments(IEnumerable<Stream> documentStreams) {
using var doc = new PdfDocument();
foreach(var stream in documentStreams)
doc.AppendDocument(stream);
var outputStream = new MemoryStream();
doc.Save(outputStream);
outputStream.Position = 0;
return outputStream;
}