Merge Documents in C#

Wordize for .NET is a professional solution for automating document merging of various formats within enterprise document workflows. The Merger class enables C# developers to programmatically combine Word documents, PDF files, images, and other formats for report preparation, documentation creation, and legal transaction support.

Key Features:

The Merge() method combines multiple documents into a single file with automatic format detection based on file extensions
Precise formatting control during merging with three main modes: complete style merging of all documents, preserving original formatting of each source, or maintaining exact layout and page structure without changes
Export capability to graphic format - the MergeToImages() method returns merge results as an array of images
Fluent API support for launching merge operations through MergerContext and method chaining, enhancing C# code clarity

Use Cases:

Combine individual sections, chapters, or modules into unified reports and technical documents for convenient distribution
Merge documents from different departments or project participants into unified presentations
Create consolidated archives from related documents for storage system optimization
Combine related legal documents, appendices, and supplements into unified packages
Merge content from various sources to create catalogs and reference materials

Test the capabilities of programmatic document merging using the interactive online demo presented on this page. Upload multiple documents, specify their merge parameters, execute the operation, and download the consolidated document for review. The provided C# code snippet is fully ready for use in your .NET project.

Run code

Upload the first document

Upload other documents

Select output format from the list

using Wordize.Merging;

Merger.Merge("Output.pdf", 
    [
        "Input1.docx", 
        "Input2.docx" 
    ]);
                            using Wordize.Merging;

Merger.Merge("Output.pdf", 
    [
        "Input1.docx", 
        "Input2.docx" 
    ]);
                            using Wordize.Merging;
using Wordize.Saving;

var imageStreams = Merger.MergeToImages(
    ["Input1.docx", "Input2.docx"], 
    new ImageSaveOptions(SaveFormat.Pdf) { PageLayout = MultiPageLayout.Vertical(10) },
    MergeFormatMode.KeepSourceFormatting
);

using var file = File.Create($"Output.pdf");
imageStreams[0].Position = 0;
imageStreams[0].CopyTo(file);
                            using Wordize.Merging;
using Wordize.Saving;

ImageSaveOptions saveOptions = new ImageSaveOptions(saveFormat);
saveOptions.PageLayout = MultiPageLayout.Vertical(10);

Merger.Create()
        .From("Input1.docx")
        .From("Input2.docx")
        .To("Output.pdf", saveOptions)
        .Execute();
                            using Wordize.Merging;

Merger.Create()
        .From("Input1.docx")
        .From("Input2.docx")
        .To("Output.pdf", SaveFormat.Pdf)
        .Execute();
            

				    Run code
			    

How to merge multiple Word, PDF documents in C#

Connect Wordize for .NET to your C# project
Call the Merge() method, specifying the output file name and collection of input files in parameters. Formats will be determined automatically based on file extensions
Get the merged file