# Resolving missing content after HTML/DOCX to PDF conversion with WordsProcessing in .NET Standard

## Environment

| Version    | Product                     | Author                                                                          |
| ---------- | --------------------------- | ------------------------------------------------------------------------------- |
| 2025.2.520 | Telerik Document Processing | [Desislava Yordanova](https://www.telerik.com/blogs/author/desislava-yordanova) |

## Description

When you generate PDF files with [RadWordsProcessing](https://www.telerik.com/document-processing-libraries/documentation/libraries/radwordsprocessing/overview) from HTML or DOCX templates, specific content may be **missing** in the output due to the fonts used in the document. This occurs because the .NET Standard version of [RadPdfProcessing](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/overview) does not have a default mechanism to read fonts. To resolve this issue, provide the font data explicitly through the **FixedExtensibilityManager** and a custom implementation of the [FontsProviderBase](https://www.telerik.com/document-processing-libraries/documentation/knowledge-base/pdfprocessing-implement-fontsprovider) class.

This knowledge base article also answers the following questions:

* Why is some text missing in RadWordsProcessing-generated PDFs?
* How do I add support for custom fonts in RadPdfProcessing?
* How do I fix missing content in exported PDF files?

## Solution

To ensure that custom fonts are correctly embedded in the PDF files:

1. **Implement a FontsProvider**:
   Create a custom class that inherits from `FontsProviderBase` and override the `GetFontData` method to provide the font data for the required fonts.

   The following example shows the implementation:

   ```csharp
   internal class FontsProvider : Telerik.Windows.Documents.Extensibility.FontsProviderBase
   {
       private string fontFolder = Environment.GetFolderPath(Environment.SpecialFolder.Fonts);

       public override byte[] GetFontData(Telerik.Windows.Documents.Core.Fonts.FontProperties fontProperties)
       {
           string fontFamilyName = fontProperties.FontFamilyName;
           bool isBold = fontProperties.FontWeight == Telerik.Documents.Core.Fonts.FontWeights.Bold;
           if (fontFamilyName == "David")
           {
               fontFolder = @"..\..\..\";
               var fontData = this.GetFontDataFromFontFolder("David.ttf");
               fontFolder = Environment.GetFolderPath(Environment.SpecialFolder.Fonts);
               return fontData;
           }

           Debug.WriteLine($"Font not found: {fontFamilyName} (Bold: {isBold})");
           return null;
       }

       private byte[] GetFontDataFromFontFolder(string fontFileName)
       {
           using (FileStream fileStream = File.OpenRead(this.fontFolder + "\\" + fontFileName))
           {
               using (MemoryStream memoryStream = new MemoryStream())
               {
                   fileStream.CopyTo(memoryStream);
                   return memoryStream.ToArray();
               }
           }
       }
   }
   ```

2. **Set the FontsProvider in FixedExtensibilityManager**:
   Assign the custom FontsProvider implementation to the `FontsProvider` property of `FixedExtensibilityManager`.

   ```csharp
   Telerik.Windows.Documents.Extensibility.FontsProviderBase fontsProvider = new FontsProvider();
   Telerik.Windows.Documents.Extensibility.FixedExtensibilityManager.FontsProvider = fontsProvider;
   ```

3. **Ensure Font Availability**:
   Download and include all necessary font files (for example, `David.ttf`) used in your document. Place them in an accessible location relative to your application.

4. **Rebuild and Run**:
   Integrate the FontsProvider implementation into your application, rebuild, and test the PDF generation process. The previously missing content should now appear in the exported PDF files.

## See Also

* [Implementing FontsProvider](https://www.telerik.com/document-processing-libraries/documentation/knowledge-base/pdfprocessing-implement-fontsprovider)
* [Standard Fonts](https://www.telerik.com/document-processing-libraries/documentation/libraries/radpdfprocessing/concepts/fonts)