ConvertAPI C# Client

Convert your files with our online file conversion API

ConvertAPI is a convenient REST API that simplifies the process of converting different file formats. You can easily create PDFs and images from sources like Word, Excel, PowerPoint, images, web pages, or raw HTML codes. Furthermore, it enables you to merge, encrypt, split, repair, and decrypt PDF files, along with other file manipulation options. With ConvertAPI, integrating it into your application takes only a few minutes, making it developer-friendly.

The ConvertAPI.NET NuGet package simplifies the usage of the Convert API in your .NET Framework, .NET Core, and .NET projects. You don't need to create your own API calls.


Run this line from Package Manager Console:

Install-Package ConvertApi



Set credentials

You can get your secret at

ConvertApi convertApi = new ConvertApi("your-api-secret");
// or token authentication
ConvertApi convertApi = new ConvertApi("your-token", "your-api-key");

Set conversion location (optional)

You have multiple options for conversion locations, and you can select your region to convert files. For instance, if you must comply with GDPR, you can choose the EU API location. Nevertheless, this choice is optional because ConvertAPI uses GEO DNS to detect the closest server automatically. For additional details, please visit

ConvertApi.ApiBaseUri = "";

File conversion

Example to convert file to PDF. All supported formats and options can be found here.

ConvertApiResponse result = await convertApi.ConvertAsync("docx", "pdf",
   new ConvertApiFileParam(@"c:\source\test.docx")   

// save to file
 var fileInfo = await result.SaveFileAsync(@"\result\test.pdf");

Other result operations:

// save all result files to folder

// get result files
ProcessedFile[] files = result.Files;

// get conversion cost
int cost = result.ConversionCost; 

Convert file url

ConvertApiResponse result = await convertApi.ConvertAsync("pptx", "pdf",
   new ConvertApiFileParam(new Uri(""))

Additional conversion parameters

ConvertAPI accepts extra conversion parameters depending on converted formats. All conversion parameters and explanations can be found here.

ConvertApiResponse result = await convertApi.ConvertAsync("pdf", "jpg",
   new ConvertApiFileParam(@"c:\source\test.pdf"),
   new ConvertApiParam("ScaleImage","true"),
   new ConvertApiParam("ScaleProportions","true"),
   new ConvertApiParam("ImageHeight","300"),
   new ConvertApiParam("ImageWidth","300")

User information

You can always check the remaining conversions amount and other account information by fetching user information.

ConvertApiUser user = await convert.GetUserAsync();
int conversionsTotal = user.ConversionsTotal;
int conversionsConsumed = user.ConversionsConsumed;

More examples

You can find more advanced examples in the examples folder.

Converting your first file, complete example:

ConvertAPI is designed to make converting files super easy. The following snippet shows how easy it is to get started. Let's convert the WORD DOCX file to PDF:

  var convertApi = new ConvertApi("your-api-secret");  
  var conversionTask = await convertApi.ConvertAsync("docx", "pdf", 
      new ConvertApiFileParam(@"c:\source\test.docx")
  var fileSaved = await conversionTask.Files.SaveFilesAsync(@"c:\");
//Catch exceptions from asynchronous methods
catch (ConvertApiException e)
  Console.WriteLine("Status Code: " + e.StatusCode);
  Console.WriteLine("Response: " + e.Response);

   if (e.StatusCode == HttpStatusCode.Unauthorized)
       Console.WriteLine("Secret is not provided or no additional seconds left in the account to proceed conversion. More information");

This is the minimum to convert a file using the ConvertAPI client, but you can do much more with the ConvertAPI .NET library. Note that you should replace your-api-secret with the secret you obtained in item two of the prerequisites.

Issues & Comments

Please leave all comments, bugs, requests, and issues on the Issues page. We'll respond to your request ASAP!


The ConvertAPI .NET Library is licensed under the MIT license. Refere to the LICENSE file for more information.