Merge pull request #593 from telerik/new-kb-apostrophe-character-replaced-copyright-symbol-acroform-ed8a71f631fe4bd1a5e2bbb440eb311b

Added new kb article apostrophe-character-replaced-copyright-symbol-acroform

Author: dessyordanova

knowledge-base/apostrophe-character-replaced-copyright-symbol-acroform.md

@@ -0,0 +1,72 @@
+---
+title: Resolving Apostrophe Character Being Replaced with Copyright Symbol in Filled PDF AcroForm
+description: Learn how to address the issue where an apostrophe character is replaced by a copyright symbol in a filled PDF AcroForm using RadPdfProcessing for Document Processing.
+type: how-to
+page_title: Fixing Apostrophe Display Issue in PDF AcroForm Fields
+meta_title: Fixing Apostrophe Display Issue in PDF AcroForm Fields
+slug: apostrophe-character-replaced-copyright-symbol-acroform
+tags: processing, document, pdf, acroform, font, encoding, text, field, xfa
+res_type: kb
+ticketid: 1692742
+---
+
+<style>
+img[alt$="><"] {
+  border: 1px solid lightgrey;
+}
+
+</style>
+
+## Environment
+
+| Version | Product | Author | 
+| ---- | ---- | ---- | 
+| 2025.2.520| RadPdfProcessing |[Desislava Yordanova](https://www.telerik.com/blogs/author/desislava-yordanova)| 
+
+## Description
+
+Learn how to address the issue where a special symbol (e.g. apostrophe character) is replaced by a copyright (or other) symbol in a filled PDF AcroForm using RadPdfProcessing. When the form is opened for editing in a viewer (like Adobe Acrobat), the character appears correctly as an apostrophe in the editor itself. 
+
+![apostrophe-character-replaced-copyright-symbol-acroform ><](images/apostrophe-character-replaced-copyright-symbol-acroform.gif)  
+
+>note This might be reproduced with other symbols as well, not only with the apostrophe character. Usually, such behavior may occur with XFA forms. However, from PDF 2.0 (ISO 32000-2) the XFA forms are depreciated.
+
+## Solution
+
+This issue is likely caused by the font encoding used in the [AcroForm]({%slug radpdfprocessing-model-interactive-forms-acroform%}) fields. If the font does not properly support the character encoding for the apostrophe or is not embedded or referenced correctly, such substitution may occur.
+
+To resolve this issue, set the font of the AcroForm fields to one of the [14 standard PDF fonts]({%slug radpdfprocessing-concepts-fonts%}), such as Helvetica, Times, or Courier. These fonts have broad character support and do not require embedding.
+
+### Steps:
+
+1. Iterate through all form fields in `RadFixedDocument.AcroForm.FormFields`.
+2. Check if the field type is [TextBox]({%slug radpdfprocessing-model-interactive-forms-form-fields-textboxfield%}) or [CombTextBox]({%slug radpdfprocessing-model-interactive-forms-form-fields-combtextboxfield%}).
+3. Set the widget font and text properties font to `FontsRepository.HelveticaBold`.
+
+### Code Implementation
+
+Use the following code snippet to update the font for all text fields in the PDF document:
+
+```csharp
+foreach (FormField field in document.AcroForm.FormFields)
+{
+    if (field.FieldType == FormFieldType.TextBox || field.FieldType == FormFieldType.CombTextBox)
+    {
+        TextField textBox = (TextField)field;
+        
+        // Set the font for the text field widgets
+        textBox.Widgets.First().TextProperties.Font = FontsRepository.HelveticaBold;
+        
+        // Set the font for the text field text properties
+        textBox.TextProperties.Font = FontsRepository.HelveticaBold;
+    }
+}
+```
+After applying the code, the apostrophe character will render correctly in the filled PDF.
+
+## See Also
+- [Fonts in RadPdfProcessing](https://docs.telerik.com/devtools/document-processing/libraries/radpdfprocessing/concepts/fonts)
+- [RadPdfProcessing Overview](https://docs.telerik.com/devtools/document-processing/libraries/radpdfprocessing/overview)
+- [Working with AcroForm Fields](https://docs.telerik.com/devtools/document-processing/libraries/radpdfprocessing/features/interactive-forms)
+
+---

knowledge-base/images/apostrophe-character-replaced-copyright-symbol-acroform.gif

@@ -165,4 +165,5 @@ You can create fonts that are not explicitly registered. Creating a font that is
  * [TextFragment]({%slug radpdfprocessing-model-textfragment%})
  * [Preserving the Font in PDF Export from Excel]({%slug preserve-font-boldness-pdf-export-radspreadprocessing%})
  * [How to Prevent Text with Special Characters from Being Cut Off when converting HTML to PDF using RadWordsProcessing]({%slug prevent-text-cut-off-pdf-conversion-radwordsprocessing%})
+ * [Resolving Apostrophe Character Being Replaced with Copyright Symbol in Filled PDF AcroForm]({%slug apostrophe-character-replaced-copyright-symbol-acroform%})
 

libraries/radpdfprocessing/concepts/fonts.md

@@ -32,5 +32,6 @@ The AcroForm class provides the following properties:
 * [FormField]({%slug radpdfprocessing-model-interactive-forms-form-fields%})
 * [FormFieldCollection class]({%slug radpdfprocessing-model-interactive-forms-formfieldcollection%})
 * [Widgets]({%slug radpdfprocessing-model-annotations-widgets%})
-* [Extracting Data from PDF Form Fields Using RadPdfProcessing]({%slug extract-pdf-form-fields-data-radpdfprocessing%})
+* [Extracting Data from PDF Form Fields Using RadPdfProcessing]({%slug extract-pdf-form-fields-data-radpdfprocessing%}) 
+* [Resolving Apostrophe Character Being Replaced with Copyright Symbol in Filled PDF AcroForm]({%slug apostrophe-character-replaced-copyright-symbol-acroform%})