EvoPdf Classic · PDF Merge

EVO PDF Merge Library

EVO PDF Merge library allows you to combine existing PDF documents in a single PDF document. It can be integrated into any .NET application, both ASP.NET web sites and desktop applications, to add pdf merge capabilities to your application.

Download for .NET Documentation

Classic v14.0 · Windows, .NET Framework 4.0+ and .NET 6–10 · Evaluate without registration — demo mode by default (watermarked) · Licensed with the EVO PDF Toolkit

$dotnet add package EvoPdf.PdfMerge

Windows · .NET Framework 4.0+ and .NET 6–10 (.NET Standard 2.0)

Program.csC#

using EvoPdf.PdfMerge;

var merge = new PDFMerge(new PdfDocumentOptions());
merge.AppendPDFFile("part1.pdf");
merge.AppendPDFFile("part2.pdf");
merge.SaveMergedPDFToFile("merged.pdf");

Classic API: EvoPdf.PdfMerge namespace, one converter class, synchronous calls. API reference →

Windows 10 / 11 / Server 2016–2025
.NET Framework 4.0 – 4.8.1
.NET 6 → 10, .NET Standard 2.0
Azure Cloud Services & Virtual Machines
Web, console and desktop applications

Features

What the PDF Merge component does

Easy integration, no installation or setup is necessary on the server
Delivered as a single strong named .NET assembly (can be installed in GAC)
Can be deployed on the server by simple copy (xcopy deployment support)
Can be used from ASP.NET, Windows Forms, WPF, Web Service or Console applications
The same assembly can be used both on 32-bit and 64-bit Windows servers
Command line and Windows Forms samples with full C# source code
Merge PDF documents from files and streams
Get number of pages of a PDF document
Specify the range of PDF pages to be merged from each PDF document
Save merged document in memory or in file
Merge PDF bookmarks
Set compression level of the resulted PDF document
Set merged document info (title, author, creation date)
Password protect the merged document
Set merged document rights for print, copy, assembling

In detail

EVO PDF Merge Library — how it works

With EVO PDF Merge library for .NET you can you can combine existing PDF documents and images in a single PDF document. The integration is extremely easy and no additional installation is necessary in order to get it working.If you need a simple ready to use tool for combining your PDF documents and images we offer you a command line utility.

It allows you to specify the merge elements in any order with a simple syntax.

At a glance

Component: EvoPdf Classic · PDF Merge
NuGet package: EvoPdf.PdfMerge
Namespace: EvoPdf.PdfMerge
Main class: PDFMerge
Runs on: Windows · .NET Framework 4.0+ · .NET 6–10 (.NET Standard 2.0)
Version: Classic v14.0
License: EVO PDF Toolkit; evaluation without registration

Documentation →

Sample.csC#

          PdfDocumentOptions pdfDocumentOptions = new PdfDocumentOptions();

          pdfDocumentOptions.PdfCompressionLevel = PDFCompressionLevel.Normal;
          pdfDocumentOptions.PdfPageSize =  PdfPageSize.A4;
          pdfDocumentOptions.PdfPageOrientation = PDFPageOrientation.Portrait;

          PDFMerge pdfMerge = new PDFMerge(pdfDocumentOptions);

          pdfMerge.AppendPDFFile(pdfFilePath);
         pdfMerge.AppendImageFile(imageFilePath);

         pdfMerge.AppendEmptyPage();

         pdfMerge.SaveMergedPDFToFile(outFile);

Installation

Install and run on Windows

The Classic library is a managed .NET assembly plus a Windows rendering engine shipped inside the NuGet package — nothing to install on the server, xcopy deployment, works in Azure Cloud Services and Virtual Machines. It targets Windows only; for Linux and macOS use EvoPdf Next.

Documentation

API reference and usage notes for the PDF Merge component.

Open the docs →

Getting started

The user guide chapters of the Classic documentation, with the C# code for each feature: options, merging, bookmarks, forms, security, deployment.

Read the guide →

Moving to Next?

EvoPdf Classic is the original engine, fully supported and licensed alongside EvoPdf Next. New projects should start with Next: Chromium rendering, Windows, Linux and macOS.

Migration guide →

Licensing

Perpetual licenses, updates and support included for a year

The HTML to PDF Converter license (450 USD Deployment / 1200 USD Company) covers the Classic and the Next converter; the EVO PDF Toolkit (650 / 1400 USD) covers every component on this site, Classic tools included. The Company License includes redistribution.

Pricing & licensing Next equivalent All downloads