Convert HTML to PDF in C# using REST API

Convert_HTML_to_PDF_File_in_CSharp.md

You can convert HTML to PDF online programmatically on the cloud. In this article, we will learn how to convert HTML to PDF in C# using REST API.

The following topics are covered in this article:

1. HTML to PDF C# Converter API - Free Download
2. How to Convert HTML to PDF in C# using REST API
3. Convert HTML to PDF in C# using Advanced Options

Convert_HTML_to_PDF_File_Online_in_CSharp.cs

// How to Convert HTML to PDF in C# using REST API
using System;
using GroupDocs.Conversion.Cloud.Sdk.Api;
using GroupDocs.Conversion.Cloud.Sdk.Client;
using GroupDocs.Conversion.Cloud.Sdk.Model;
using GroupDocs.Conversion.Cloud.Sdk.Model.Requests;

namespace GroupDocs.Conversion.CSharp
{
  // Change HTML to PDF File Online
  class Convert_HTML_to_PDF
  {
    static void Main(string[] args)
    {
      try
      {
        // Create necessary API instances
        var apiInstance = new ConvertApi(configuration);
        // Prepare convert settings
        var settings = new ConvertSettings
        {
          FilePath = "csharp-testing/input-sample-file.html",
          Format = "pdf",
          OutputPath = "csharp-testing/output-sample-file.pdf"
        };
        
        // Convert to specified format
        var response = apiInstance.ConvertDocument(new ConvertDocumentRequest(settings));
        Console.WriteLine("Successfully converted HTML to PDF format online in C#: " + response[0].Url);
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs ConvertApi: " + e.Message);
      }
    }
  }
}

Convert_HTML_to_PDF_File_using_Advanced_Options_in_CSharp.cs

// How to Convert HTML to PDF in C# using Advanced Options
using System;
using GroupDocs.Conversion.Cloud.Sdk.Api;
using GroupDocs.Conversion.Cloud.Sdk.Client;
using GroupDocs.Conversion.Cloud.Sdk.Model;
using GroupDocs.Conversion.Cloud.Sdk.Model.Requests;

namespace GroupDocs.Conversion.CSharp
{
  // Change HTML to PDF File Online
  class Convert_HTML_to_PDF
  {
    static void Main(string[] args)
    {
      try
      {
        // Create necessary API instances
        var apiInstance = new ConvertApi(configuration);
        // Prepare convert settings
        var settings = new ConvertSettings
        {
          FilePath = "csharp-testing/input-sample-file.html",
          Format = "pdf",
          ConvertOptions = new PdfConvertOptions
          {
              CenterWindow = true,
              CompressImages = false,
              DisplayDocTitle = true,
              Dpi = 1024,
              FitWindow = false,
              FromPage = 1,
              Grayscale = false,
              ImageQuality = 100,
              Linearize = false,
              MarginTop = 5,
              MarginLeft = 5,
              Password = "password",
              UnembedFonts = true,
              RemoveUnusedStreams = true,
              RemoveUnusedObjects = true,
              RemovePdfaCompliance = false
          },
          OutputPath = "csharp-testing/output-sample-file.pdf"
        };
        
        // Convert to specified format
        var response = apiInstance.ConvertDocument(new ConvertDocumentRequest(settings));
        Console.WriteLine("Successfully converted HTML to PDF online using C#: " + response[0].Url);
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs ConvertApi: " + e.Message);
      }
    }
  }
}

Download_Convert_HTML_to_PDF_in_CSharp.cs

// How to Download converted HTML file in C#
using System;
using GroupDocs.Conversion.Cloud.Sdk.Api;
using GroupDocs.Conversion.Cloud.Sdk.Client;
using GroupDocs.Conversion.Cloud.Sdk.Model.Requests;

namespace GroupDocs.Conversion.CSharp
{
  // Download Output File
  class Download_File
  {
    static void Main(string[] args)
    {
      try
      {
        // initialize api
        var fileApi = new FileApi(configuration);
        // create download file request
        var downloadRequest = new DownloadFileRequest("csharp-testing/output-sample-file.pdf", myStorage);
        // download file
        Stream downloadResponse = fileApi.DownloadFile(downloadRequest);

        // save file in working directory
        using (var fileStream = System.IO.File.Create("H:\\groupdocs-cloud-data\\output-sample-file.pdf"))
        {
          downloadResponse.Seek(0, SeekOrigin.Begin);
          downloadResponse.CopyTo(fileStream);
        }
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs FileApi: " + e.Message);
      }

    }
  }
}

Upload_to_HTML_to_PDF_File_in_CSharp.cs

using System;
using GroupDocs.Conversion.Cloud.Sdk.Api;
using GroupDocs.Conversion.Cloud.Sdk.Client;
using GroupDocs.Conversion.Cloud.Sdk.Model.Requests;
using System.IO;

namespace GroupDocs.Conversion.CSharp
{
  // Upload Sample File
  class Upload_File
  {
    static void Main(string[] args)
    {
      try
      {
        // initialize api
        var fileApi = new FileApi(configuration);

        // open file
        var fileStream = File.Open(@"H:\groupdocs-cloud-data\input-sample-file.html", FileMode.Open);

        // create file upload request
        var request = new UploadFileRequest("csharp-testing/input-sample-file.html", fileStream, myStorage);

        // upload file
        var response = fileApi.UploadFile(request);
        Console.WriteLine("HTML File Upload Process Completed: " + response.Uploaded.Count.ToString());
        fileStream.Close();
      }
      catch (Exception e)
      {
        Console.WriteLine("Exception when calling GroupDocs FileApi: " + e.Message);
      }
    }
  }
}

Utils_to_Convert_HTML_to_PDF_Online_in_CSharp.cs

//Get clientId & clientSecret from https://dashboard.groupdocs.cloud (free registration is required).
string clientId = "xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx";
string clientSecret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
string myStorage = "test-internal-storage";

var configuration = new Configuration(clientId, clientSecret);
configuration.ApiBaseUrl = "https://api.groupdocs.cloud";