Using Document .Net in Linux

We express our huge gratitude to Peter Robinson for the creation of manual about «Using Document .Net in Linux» (PDF).

Preparing environment

In order to build multi-platform applications using .NET Core on Linux, the first steps are for installing in our Linux machine the required tools.

We need to install .NET Core SDK from Microsoft and to allow us to develop easier, we will install an advance editor with a lot of features, Visual Studio Code from Microsoft.

Both installations are very easy and the detailed description can be found by these two links:

  1. Install .NET Core SDK for Linux..
  2. Install VS Code for Linux..
  3. Install C# extension to facilitate us to code and debugging.

Check the installed Fonts availability

Check that the directory with fonts "/usr/share/fonts/truetype" is exist. Also check that it contains *.ttf files.

    If you don't see this folder, make these steps:
  1. Download the archive with *.ttf fonts: Fonts.tar
  2. Uncompress the downloaded font’s archive to a directory and add it to the font path, a list of directories containing fonts:# tar xvzf
  3. Create a directory for new fonts # mkdir /usr/share/fonts/truetype
  4. Move the uncompressed font files to the new font directory# mv *.ttf /usr/share/fonts/truetype
  5. Navigate to the font directory # cd /usr/share/fonts/truetype
  6. Create fonts.scale and fonts.dir # mkfontscale && mkfontdir # fc-cache
  7. Add the new font directory to the X11 font path# chkfontpath --add /usr/share/fonts/truetype
  8. Restart X font server # /etc/rc.d/init.d/xfs restart

You can verify the successful addition of the new path by running chkfontpath command or by listing X font server's /etc/X11/XF86Config file.

If you do not have root access, copy the *.ttf to ~/.fonts directory instead.

Or you may install “Microsoft TrueType core fonts” using terminal and command: $ sudo apt install ttf-mscorefonts-installer

Read more about TrueType Fonts and “How to install Microsoft fonts, How to update fonts cache files, How to confirm new fonts installation” .

With these steps, we will ready to start developing.

In next paragraphs we will explain in detail how to create simple console application. All of them are based on this VS Code guide:

Get Started with C# and Visual Studio Code

Not only is possible to create .NET Core applications that will run on Linux using Linux as a developing platform. It is also possible to create it using a Windows machine and any modern Visual Studio version, as Microsoft Visual Studio Community 2022.

Creating “Convert PDF to DOCX” application

Create a new folder in your Linux machine with the name pdf to docx.

For example, let’s create the folder “pdf to docx” on Desktop ( Right click-> New Folder):

Open VS Code and click in the menu File->Open Folder. From the dialog, open the folder you’ve created previously:

Next you will see the similar screen:

Now, open the integrated console – the Terminal: follow to the menu Terminal -> New

Terminal (or press Ctrl+Shift+’):

Create a new console application, using dotnet command.

Type this command in the Terminal console: dotnet new console

command: dotnet run

You can see the typical “Hello world!” message.

Now we are going to convert this simple application into something more interesting. We’ll transform it into an application that will convert a pdf file to a docx file.

First of all, we need to add the package reference to the sautinsoft.document assembly using Nuget.

In order to do it, follow to the Explorer and open project file “pdf to docx.csproj” within

VS Code to edit it:

<PackageReference Include="Svg.Skia" Version="" />
<PackageReference Include="SautinSoft.Document" Version="*" />
<PackageReference Include="System.IO.Packaging" Version="4.4.0" />
<PackageReference Include="System.Text.Encoding.CodePages" Version="4.5.0" />
<PackageReference Include="System.Xml.XPath.XmlDocument" Version="4.3.0" />
<PackageReference Include="SkiaSharp" Version="2.88.6" />
<PackageReference Include="SkiaSharp.NativeAssets.Linux" Version="2.88.6"

It’s the reference to sautinsoft.document package from Nuget.

At the moment of writing this manual, the latest version of sautinsoft.document was

2024.X. But you may specify the latest version, to know what is the latest, follow:

At once as we’ve added the package reference, we have to save the “pdf to docx.csproj” and restore the added package.

Follow to the Terminal and type the command: dotnet restore

write the code to convert pdf to docx and other formats.

Follow to the Explorer, open the Program.cs, remove all the code and type the new:

using System;
using System.IO;
using SautinSoft.Document;
namespace pdf_to_docx
    class Program
        static void Main(string[] args)
            string inpFile = @"/example.pdf";
            string outFile = Path.ChangeExtension(inpFile,".docx");
            DocumentCore dc = DocumentCore.Load(inpFile, new PdfLoadOptions()
            ConversionMode = PdfConversionMode.Flowing, PreserveEmbeddedFonts = true

To make tests, we need an input PDF document. For our tests, let’s place a PDF file with the name “example.pdf” at the Desktop.

If we open this file in the default PDF Viewer, we’ll its contents:

Launch our application and convert the “example.pdf” into “example.docx”, type the

command: dotnet run

If you don't see any exceptions, everything is fine and we can check the result produced by the Document .Net library.

The new file “example.docx” has to appear on the Desktop:

Open the result in LibreOffice:

Well done! You have created the “PDF to DOCX” application under Linux!

Creating new DOCX document from scratch

Now we're going to develop a new application that will be able to create a new docx document and to add some content in it.

As we did before, create a new folder and name it "create docx". Open this folder within VS Code and repeat the same steps as done before, creating a new console project, adding dependencies and so on.

Once you have done and are ready to code your new program, type this within Program.cs as shown in the picture below (the complete code is after the picture):

using System;
using SautinSoft.Document;
namespace create_docx
    class Program
        static void Main(string[] args)
            string docxFile = @"/home/jorgen/Desktop/Result.docx";
            DocumentCore dc = new DocumentCore();
            Section section = new Section(dc);
            section.PageSetup.PaperType = PaperType.A4;
            // Way 1: Add 1st paragraph.
            Paragraph par1 = new Paragraph(dc);
            par1.ParagraphFormat.Alignment = HorizontalAlignment.Center;
            // Let's create a characterformat for text in the 1st paragraph.
            CharacterFormat cf = new CharacterFormat() { FontName = "Verdana", Size = 16, FontColor = Color.Orange };
    Run text1 = new Run(dc, "This is a first line in 1st paragraph!");
            text1.CharacterFormat = cf;
            // Let's add a line break into our paragraph.
            par1.Inlines.Add(new SpecialCharacter(dc, SpecialCharacterType.LineBreak));
            Run text2 = text1.Clone();
            text2.Text = "Let's type a second line.";
            // Way 2 (easy): Add 2nd paragraph using ContentRange.
            dc.Content.End.Insert("\nThis  is  a  first  line  in  2nd  paragraph.",  new
            CharacterFormat() { Size = 25, FontColor = Color.Blue, Bold = true });
            SpecialCharacter lBr = new SpecialCharacter(dc, SpecialCharacterType.LineBreak);
            dc.Content.End.Insert("This is a second line.", new CharacterFormat() { Size = 20, FontColor = Color.DarkGreen, UnderlineStyle = UnderlineType.Single });
            // Save a document to a file into DOCX format.
            dc.Save(docxFile, new DocxSaveOptions());
            // Open the result for demonstration purposes.
            System.Diagnostics.ProcessStartInfo(docxFile) { UseShellExecute = true });

If you need a new code example or have a question: email us at or ask at Online Chat (right-bottom corner of this page) or use the Form below:

Questions and suggestions from you are always welcome!

We are developing .Net components since 2002. We know PDF, DOCX, RTF, HTML, XLSX and Images formats. If you need any assistance with creating, modifying or converting documents in various formats, we can help you. We will write any code example for you absolutely free.