Convert multiple HTML files to single PDF file using C# and .NET

Complete code

using System;
using System.IO;
using System.Collections.Generic;
using SautinSoft.PdfVision;

namespace Sample
    class Program
        static void Main(string[] args)
        public static void ConvertMultipleHtmlToPdfFile()
            string[] inpFiles = new string[]
            string outFile = new FileInfo("Result.pdf").FullName;

            PdfVision v = new PdfVision();
            HtmlToPdfOptions options = new HtmlToPdfOptions()
                PageSetup = new PageSetup()
                    PaperType = PaperType.Letter,
                    Orientation = Orientation.Portrait,
                    PageMargins = new PageMargins()
                        Left = LengthUnitConverter.ToPoint(5, LengthUnit.Millimeter),
                        Top = LengthUnitConverter.ToPoint(5, LengthUnit.Millimeter),
                        Right = LengthUnitConverter.ToPoint(5, LengthUnit.Millimeter),
                        Bottom = LengthUnitConverter.ToPoint(5, LengthUnit.Millimeter)
                PrintBackground = true,
               	Scale = 1,
				//Set a custom directory where will be placed portable Chromium browser. 
				//Default value depends of platform (win-x64, win-86, linux-x64 or osx-x64). 
				ChromiumBaseDirectory = Path.GetFullPath(@"..\..\..\..\..\..\Chromium\")

                List<byte[]> pdfCollection = new List<byte[]>();
                foreach (string inpFile in inpFiles)
                    Console.WriteLine($"Converting {Path.GetFileName(inpFile)} ...");
                    byte[] pdfData = v.ConvertHtmlToPdf(inpFile, options);

                // Merge PDFs into single PDF document.
                byte[] singlePdfData = v.MergePdf(pdfCollection);
                File.WriteAllBytes(outFile, singlePdfData);

                // Open the result for demonstration purposes.
                System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(outFile) { UseShellExecute = true });
            catch (Exception ex)
                Console.WriteLine($"Error: {ex.Message}");


Imports System
Imports System.IO
Imports System.Collections.Generic
Imports SautinSoft.PdfVision

Namespace Sample
	Friend Class Program
		Shared Sub Main(ByVal args() As String)
		End Sub
		Public Shared Sub ConvertMultipleHtmlToPdfFile()
			Dim inpFiles() As String = {Path.GetFullPath("..\..\..\1.html"), Path.GetFullPath("..\..\..\2.html")}
			Dim outFile As String = (New FileInfo("Result.pdf")).FullName

			Dim v As New PdfVision()
			Dim options As New HtmlToPdfOptions() With {
				.PageSetup = New PageSetup() With {
					.PaperType = PaperType.Letter,
					.Orientation = Orientation.Portrait,
					.PageMargins = New PageMargins() With {
						.Left = LengthUnitConverter.ToPoint(5, LengthUnit.Millimeter),
						.Top = LengthUnitConverter.ToPoint(5, LengthUnit.Millimeter),
						.Right = LengthUnitConverter.ToPoint(5, LengthUnit.Millimeter),
						.Bottom = LengthUnitConverter.ToPoint(5, LengthUnit.Millimeter)
				.PrintBackground = True,
				.Scale = 1,
				.ChromiumBaseDirectory = Path.GetFullPath("..\..\..\..\..\..\Chromium\")

				Dim pdfCollection As New List(Of Byte())()
				For Each inpFile As String In inpFiles
					Console.WriteLine($"Converting {Path.GetFileName(inpFile)} ...")
					Dim pdfData() As Byte = v.ConvertHtmlToPdf(inpFile, options)
				Next inpFile

				' Merge PDFs into single PDF document.
				Dim singlePdfData() As Byte = v.MergePdf(pdfCollection)
				File.WriteAllBytes(outFile, singlePdfData)

				' Open the result for demonstration purposes.
				System.Diagnostics.Process.Start(New System.Diagnostics.ProcessStartInfo(outFile) With {.UseShellExecute = True})
			Catch ex As Exception
				Console.WriteLine($"Error: {ex.Message}")
			End Try
		End Sub
	End Class
End Namespace


If you need a new code example or have a question: email us at or ask at Online Chat (right-bottom corner of this page) or use the Form below:

Questions and suggestions from you are always welcome!

We are developing .Net components since 2002. We know PDF, DOCX, RTF, HTML, XLSX and Images formats. If you need any assistance with creating, modifying or converting documents in various formats, we can help you. We will write any code example for you absolutely free.