VSDX to PDF using C#
The C# library for converting Visio documents to PDF files.
Features of Our VSDX to PDF for C#
The C# library for converting Visio VSDX documents to PDF files.
Lightning Fast Conversions
Process and convert files in seconds with our high-performance cloud infrastructure.
Accuracy Guaranteed
Our advanced algorithms ensure pixel-perfect and content-accurate file conversions.
Enterprise-Grade Security
ISO 27001, HIPAA, SOC 2, and GDPR compliant with encrypted file processing.
Global Infrastructure
Strategically located servers ensure low latency and high availability worldwide.
Developer Friendly
Comprehensive SDKs and clear documentation for quick and simple integration.
Time-Saving Automation
Automate repetitive document workflows and focus on what matters most.
Compatible With All .NET Frameworks & Tools
Integrate using C#
Easy VSDX to PDF integration programmatically using our simple C# SDK
NuGet library install
Install the ConvertAPI library from NuGet or compile from source code found in GitHub.
Authenticate
Sign up for a free account and authenticate the library using your Secret key or API token.
Customize Parameters
Set up the conversion parameters, and copy the auto-generated code snippet in your account dashboard.
Step-by-Step Guide
Easy VSDX to 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 VSDX to PDF conversion with just a few lines of code. Convert VSDX to PDF 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. VSDX to PDF using C# .NET
Once you have your authentication in place, simply copy-paste this VSDX to PDF conversion code snippet into your C# project:
Advanced C# SDK Techniques
Take your ConvertAPI C# integrations to the next level with advanced techniques for real-world, production-grade document conversion workflows.
These advanced patterns help you build robust, scalable, and efficient VSDX to PDF pipelines in your .NET applications while maintaining flexibility and control over your document workflows.
Convert a Remote VSDX File
The following C# example demonstrates how to convert a VSDX file hosted online (accessible via a public URL) directly to PDF using ConvertAPI. This is useful when your documents are already stored on cloud storage (S3, Azure Blob, etc.) and you want to convert them without downloading locally first.
In this example:
- No local download needed before conversion.
- The VSDX file is fetched from the provided URL.
- ConvertAPI converts it to PDF and saves it to a temporary folder on your server or local machine.
- Ideal for server-side processing pipelines and automated workflows.
var convertApi = new ConvertApi("api_key");
var sourceFile = new Uri("https://cdn.convertapi.com/public/files/demo.vsdx");
Console.WriteLine($"Converting online {sourceFile} document to PDF...");
var vsdxToPdfResult = await convertApi.ConvertAsync("vsdx", "pdf", new ConvertApiFileParam(sourceFile));
var outputFileName = vsdxToPdfResult.Files[0];
var fileInfo = await outputFileName.SaveFileAsync(Path.Combine(Path.GetTempPath(), outputFileName.FileName));
Console.WriteLine("The PDF result saved to " + fileInfo);Convert a VSDX File Stream to PDF and Receive a File Stream
This C# example demonstrates how to convert a VSDX file provided as a stream directly to PDF using ConvertAPI and receive the converted PDF as a stream without writing to disk. This is ideal for in-memory processing in ASP.NET APIs, serverless functions, or pipeline services where you need to handle documents securely and efficiently.
In this example:
- You pass a VSDX file stream (vsdx_stream) with a filename hint to ConvertAPI.
- ConvertAPI converts the document to PDF without saving intermediate files.
- The converted PDF is returned as a stream (outputStream) for direct processing, returning to clients, or further manipulation in your pipeline.
- Ideal for secure, diskless document conversion workflows.
var conversionResult = await convertApi.ConvertAsync("vsdx", "pdf",
new ConvertApiFileParam(vsdx_stream, "test.vsdx")
);
var outputStream = await conversionResult.Files.First().FileStreamAsync();
Console.Write(new StreamReader(outputStream).ReadToEnd());
Console.WriteLine("End of file stream.");Handling Exceptions During VSDX to PDF Conversion
This C# example shows how to handle exceptions when converting a VSDX file to PDF using ConvertAPI. By catching ConvertApiException, you can access detailed error information, making it easier to debug issues such as invalid API tokens, unsupported file formats, or conversion errors in your workflow.
In this example:
- A try-catch block safely wraps the VSDX to PDF conversion.
- If the API call fails, ConvertApiException provides the HTTP status code and API response details for clear diagnostics.
- This approach ensures your application can handle errors gracefully, log issues, and respond with meaningful messages to users or calling services.
try
{
var convertApi = new ConvertApi("api_token");
const string sourceFile = @"..\..\..\TestFiles\test.vsdx";
var convert = await convertApi.ConvertAsync("vsdx", "pdf",
new ConvertApiFileParam(sourceFile));
}
//Catch exceptions and write details
catch (ConvertApiException e)
{
Console.WriteLine("Status Code: " + e.StatusCode);
Console.WriteLine("Response: " + e.Response);
}
Customizable Parameters
Fine-tune your automation with these powerful conversion options
Sets the password to open protected documents.
Include background pages.
Render all colors in the converting document as black.
Convert document metadata like Title, Author, Keywords to PDF metadata.
Embed fonts in PDF.
Include in the output PDF document only the font characters that are used in the original document.
Sets the Subset Fonts threshold. If the percentage of used characters, compared with total characters of the particular font, exceeds this threshold, the entire font is embedded.
Set PDF version.
Available values: Acrobat 3 (PDF 1.2) Acrobat 4 (PDF 1.3) Acrobat 5 (PDF 1.4) Acrobat 6 (PDF 1.5) Acrobat 7 (PDF 1.6) Acrobat 8 (PDF 1.7) Acrobat 9 (PDF 1.7, e-level 3) Acrobat DC (PDF 2.0)
Set PDF resolution.
Provide a value to customize the PDF title. Otherwise, the default document title will be used. Use single quotes and a space (' ') to remove the title.
Provide a value to customize the PDF subject. Otherwise, the default document subject will be used. Use single quotes and a space (' ') to remove the subject.
Provide a value to customize the PDF author. Otherwise, the default document author will be used. Use single quotes and a space (' ') to remove the author.
Provide a value to customize the PDF keywords. Otherwise, the default document keywords will be used. Use single quotes and a space (' ') to remove the keywords.
Set the page number at which the PDF document should open.
Set the default zoom percentage for when you open PDF files .
Available values: Default Actual Size Fit Page Fit Width Fit Height Fit Visible 25% 50% 75% 100% 125% 150% 200% 400% 800% 1600% 2400% 3200% 6400%
Automatically rotate pages based on the orientation of the text. By Page option will rotate each page based on the direction of the text on that page. All option will rotate all pages in the document based on the orientation of the majority of text.
Available values: Disabled By Page All
Set PDF color space.
Available values: Default RGB CMYK Gray
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 500+ 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.
Integrate within minutes
Our user-friendly interactive demo enables you to easily set up and test the conversion from your account dashboard with just a few simple clicks.
Set up VSDX to PDF parameters
Upload your VSDX document that you wish to convert, and set up any additional conversion parameters using our intuitive and user-friendly interface. You can fine-tune and adjust the conversion parameters to suit your needs with no technical knowledge required.
Get Started for Free
Download the Conversion Result
When you have your conversion parameters set up, you can run the conversion and download the converted document to evaluate the VSDX to PDF conversion quality. You can further adjust the parameters if needed, until you are satisfied with the result.
Get Started for Free
Copy Auto-Generated Code Snippet
Once you are happy with the conversion result, you can copy the auto-generated code snippet to your project and use it to perform the conversion programmatically. This will save you time and effort, and you will be able to focus on your project development.
Get Started for Free
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!"
Data security is our top priority
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