Modify Tools
Merge PDF C# Overview
The Merge PDF C# library allows users to combine multiple PDF files into a single PDF document.
Some key features of the Merge PDF C# library include retaining page numbering, eliminating duplicate fonts for improved performance, and generating a table of contents for the merged documents. Additionally, it offers properties like page size to set a consistent page size across the merged document and page orientation to choose between portrait and landscape orientations, ensuring that the final output meets specific formatting requirements.
This C# library is useful for organizing content and reducing the number of separate files by merging them into one.
Fast Processing
Merge multiple PDFs in seconds, no matter how large your files are.
Preserve Quality
Maintain the original quality and formatting of your PDF documents.
Enterprise-Grade Security
ISO 27001, HIPAA and GDPR compliant with encrypted file processing.
Developer Friendly
Comprehensive SDKs and clear documentation for quick and simple integration.
Time-Saving Automation
Automate repetitive document merging and focus on what matters most.
Professional Results
Get perfectly merged PDFs ready for professional use.
Customizable Parameters
Fine-tune your automation with these powerful conversion options
Files
File Supported formats: .pdfFiles 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 PDF.
RemoveDuplicateFonts
Bool Default: FalseDo not include the same fonts from source PDFs while merging.
BookmarksToc
Collection Default: disabledAdds a top-level bookmark for each file, using the filename or PDF title from metadata.
Values: disabled filename titlePageSize
Collection Default: defaultScales each page to match the selected page size during PDF merging.
Values: default a2 a3 a4 a5 a6 letter legalPageOrientation
Collection Default: defaultSets the orientation of each page during PDF merging.
Values: default portrait landscapeOpenPage
Integer Default: 1Set the page number at which the PDF document should open.
Range: 1 .. 3000StoreFile
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
Easy Merge PDF integration programmatically using our simple C# SDK
1. C# library install
ConvertAPI provides an ASP.NET C# library that allows you to perform a Merge PDF conversion with just a few lines of code. Convert PDF 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 PDF using C# .NET
Once you have your authentication in place, simply copy-paste this Merge PDF conversion code snippet into your C# project:
Integrate within minutes
Easy Merge PDF 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.
Businesses trust us
Highest rated File Conversion API on major B2B software listing platforms: Capterra, G2, and Trustpilot.
"ConvertAPI has been a game-changer for our document automation workflows. Their conversion accuracy and API reliability are unmatched in the industry for over 7 years."
"ConvertAPI is a reliable, cost-effective solution with a proven track record of stability. It has grown significantly in maturity, adopting enterprise-grade practices over the years."
"We've integrated ConvertAPI across our entire document processing platform. The performance is exceptional and the support team is always responsive. Highly recommended!"
Enterprise-Grade Security
We ensure that all document processing is handled securely in the cloud, adhering to industry-leading standards like ISO 27001, GDPR, and HIPAA. To enhance security even further, we can ensure that no files or data are stored on our servers and never leave your country.
Learn more about security