Document Tools
Merge DOCX C# Overview
The Merge DOCX C# library allows users to combine multiple Word documents into a single DOCX file.
Some key features of the Merge DOCX C# library include keeping the original formatting of every merged document, separating documents with a section break or a page break, and updating page numbers and tables of contents to match the combined result. Password protected documents are supported, and legacy DOC files can be mixed with DOCX.
This C# library is useful for assembling contracts, reports, and generated documents into a single Word file as part of an automated workflow.
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Customizable Parameters
Fine-tune your automation with these powerful conversion options
Files
File Supported formats: .docx .docFiles to be converted. Value can be URL or file content. If used in query or multipart content parameter must be suffixed with index e.g. Files[0], Files[1], Files[2]...
Password
StringSets the password to open protected documents.
BreakType
Collection Default: sectionSets the break inserted between merged documents. Section keeps each document's own headers, footers, page size, and margins. Page starts each document on a new page. None appends documents without a break, so the content flows continuously.
Values: section page noneKeepSourceFormatting
Bool Default: TruePreserves the original fonts, styles, and paragraph spacing of every merged document, the same as the Keep Source Formatting paste option in Word. When disabled, merged documents are restyled with the styles of the first document.
UpdateFields
Bool Default: FalseUpdates page numbers, tables of contents, and cross-references after the merge, so they reflect the pagination of the combined document.
StoreFile
Bool Default: FalseWhen the StoreFile parameter is set to True, your converted file is written to ConvertAPI’s encrypted, temporary storage and made available via a time-limited secure download URL, valid for up to 3 hours. After this period, the file is permanently deleted.
When StoreFile is set to False, conversion happens entirely in-memory. The raw file bytes are streamed back in the API response without touching disk or external storage, ensuring maximum security and zero persistence so that only you can access the content.
Step-by-Step Guide
Simple Merge DOCX integration using our .NET C# SDK
1. C# library install
ConvertAPI provides an ASP.NET C# library that allows you to perform a Merge DOCX conversion with just a few lines of code. Convert DOCX to MERGE using C# programming language with no effort at all!
NuGet Terminal >
Install-Package ConvertApi
2. Authenticate ConvertAPI C# library
You can obtain your API Token by signing up for a free account. Once you sign up, you'll receive 250 free conversions instantly! Grab your authentication key from the account dashboard, and authenticate the ConvertAPI C# library like this:
// get your API Token here: https://www.convertapi.com/a/auth
ConvertApi convertApi = new ConvertApi("api_token");
3. Merge DOCX using C# .NET
Once you have your authentication in place, simply copy-paste this Merge DOCX conversion code snippet into your C# project:
Integrate within minutes
Easy Merge DOCX automation using our simple C# SDK
Compatible With All .NET Frameworks & Tools
Frequently Asked Questions
What is ConvertAPI C# SDK?
The ConvertAPI C# SDK is a lightweight, easy-to-use library for .NET developers to integrate document and file conversions into their applications with minimal code. It connects directly to the ConvertAPI REST service, allowing you to automate file conversions, merging, splitting, and more.
What types of conversions are supported?
ConvertAPI offers 300+ converters and tools, including DOCX to PDF, XLSX to PDF, PDF to JPG, HTML to PDF, image processing, metadata extraction, compression, and advanced document workflows. You can automate complex document processing scenarios within your .NET applications using the SDK.
Can I build complex conversion workflows using the SDK?
Yes, the ConvertAPI .NET C# SDK allows you to chain conversions, merge documents, extract pages, and apply advanced parameters to automate end-to-end document workflows within your applications.
Is there a file size limit when using ConvertAPI?
The maximum file size you can convert depends on your ConvertAPI plan type. Higher-tier plans allow larger files and increased concurrency for high-volume document processing needs.
Can I convert files entirely in memory without storing them on your servers?
Yes, ConvertAPI supports in-memory conversions, allowing you to send and receive files as streams without saving them to disk on ConvertAPI servers. This enables secure, diskless workflows for sensitive or temporary files.
Which .NET versions does the ConvertAPI SDK support?
The SDK supports .NET Framework 4.5+, .NET Core, .NET 5, 6, 7, and 8, ensuring compatibility across your existing and new projects.
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