Added new kb article fixing-double-bold-text-issue-in-pdf-document

Author: KB Bot

knowledge-base/fixing-double-bold-text-issue-in-pdf-document.md

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+---
+title: Resolving Double-Bold Appearance in PDF Export Using Telerik WordsProcessing
+description: Learn how to resolve the double-bold appearance issue in PDFs generated by Telerik WordsProcessing using font registration and style configuration.
+type: how-to
+page_title: Fixing Double-Bold Text Issue in PDFs Exported from Telerik WordsProcessing
+meta_title: Fixing Double-Bold Text Issue in PDFs Exported from Telerik WordsProcessing
+slug: fixing-double-bold-text-issue-in-pdf-document
+tags: words,processing, pdf, pdfformatprovider, font,embed, arial-narrow, register
+res_type: kb
+ticketid: 1698628
+---
+
+## Environment
+
+| Version | Product | Author | 
+| ---- | ---- | ---- | 
+| 2025.3.806| RadPdfProcessing |[Desislava Yordanova](https://www.telerik.com/blogs/author/desislava-yordanova)| 
+
+## Description
+
+When exporting documents to PDF using Telerik WordsProcessing, the bold text may appear "double-bold" in PDF viewers like Edge or Chrome. This issue arises due to font embedding settings or inaccuracies in font file access, specifically with condensed fonts like Arial Narrow Bold.
+
+This knowledge base article also answers the following questions:
+- How to fix bold text rendering issues in PDFs generated by Telerik WordsProcessing?
+- Why does the bold text in PDFs look thicker than expected?
+- How to correctly embed Arial Narrow Bold in Telerik WordsProcessing?
+
+## Solution
+
+To resolve the double-bold appearance issue, manually register the correct font files for Arial Narrow Bold and configure the style settings properly. Follow these steps:
+
+1. Register the correct font files at the start of your application using `FontsRepository.RegisterFont`. This ensures that the library uses the appropriate font variations for bold and italic.
+
+   ```csharp
+   FontsRepository.RegisterFont(new System.Windows.Media.FontFamily("Arial Narrow"), FontStyles.Normal, FontWeights.Bold,
+       File.ReadAllBytes(@"C:\WINDOWS\FONTS\ARIALNB.TTF"));
+   FontsRepository.RegisterFont(new System.Windows.Media.FontFamily("Arial Narrow"), FontStyles.Italic, FontWeights.Normal,
+       File.ReadAllBytes(@"C:\WINDOWS\FONTS\ARIALNI.TTF"));
+   FontsRepository.RegisterFont(new System.Windows.Media.FontFamily("Arial Narrow"), FontStyles.Italic, FontWeights.Bold,
+       File.ReadAllBytes(@"C:\WINDOWS\FONTS\ARIALNBI.TTF"));
+   ```
+
+2. Define a style for the references section to apply the correct font family and weight settings.
+
+   ```csharp
+   Telerik.Windows.Documents.Flow.Model.Styles.Style referenceStyleChar = new Telerik.Windows.Documents.Flow.Model.Styles.Style("ReferenceStyleChar", StyleType.Character);
+   referenceStyleChar.Name = "Reference Style Char";
+   referenceStyleChar.CharacterProperties.FontFamily.LocalValue = new ThemableFontFamily("Arial Narrow");
+   referenceStyleChar.CharacterProperties.FontStyle.LocalValue = FontStyles.Normal;
+   referenceStyleChar.CharacterProperties.FontWeight.LocalValue = FontWeights.Bold;
+   document.StyleRepository.Add(referenceStyleChar);
+   ```
+
+3. Apply the style to the desired text or runs in your document.
+
+   ```csharp
+   foreach (var referenceParagraph in referenceParagraphs)
+   {
+       foreach (var inline in referenceParagraph.Inlines)
+       {
+           Run run = inline as Run;
+           if (run != null)
+           {
+               run.StyleId = "ReferenceStyleChar";
+           }
+       }
+   }
+   ```
+
+4. Use the `FontEmbeddingType.Subset` setting when exporting to PDF to avoid redundant font embedding.
+
+   ```csharp
+   PdfFormatProvider PDFprovider = new PdfFormatProvider();
+   PDFprovider.ExportSettings = new Telerik.Windows.Documents.Flow.FormatProviders.Pdf.Export.PdfExportSettings
+   {
+       FontEmbeddingType = FontEmbeddingType.Subset
+   };
+
+   using (Stream output = File.OpenWrite(Server.MapPath("~/App_Data/Output.pdf")))
+   {
+       PDFprovider.Export(document, output, TimeSpan.FromSeconds(10));
+   }
+   ```
+
+5. Test the exported PDF in different viewers to confirm that the bold text appears correctly without the "double-bold" effect.
+
+## See Also
+
+- [WordsProcessing Overview](https://docs.telerik.com/devtools/document-processing/libraries/radwordsprocessing/overview)
+- [PdfFormatProvider](https://docs.telerik.com/devtools/document-processing/libraries/radpdfprocessing/pdfformatprovider/overview)
+- [FontEmbeddingType Enum](https://docs.telerik.com/devtools/document-processing/api/telerik.windows.documents.flow.formatproviders.pdf.export.fontembeddingtype)
+- [RegisterFont Method](https://docs.telerik.com/devtools/document-processing/api/telerik.windows.documents.flow.model.fonts.fontrepository#registerfont)
+- [System.Windows.Media.Typeface.TryGetGlyphTypeface Issue](https://learn.microsoft.com/en-us/dotnet/api/system.windows.media.typeface.trygetglyphtypeface?redirectedfrom=MSDN)
+
+