How to replace fonts in WinForms PDF using C# and VB.NET?

Syncfusion Essential PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can replace fonts in a PDF using C# and VB.NET.

Steps to replace fonts in PDF programmatically:

1. Create a new C# console application project.
2. Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.
3. Include the following namespaces in the Program.cs file.

C#

using Syncfusion.Pdf.Graphics;
using Syncfusion.Pdf.Parsing;

VB.NET

Imports Syncfusion.Pdf.Graphics
Imports Syncfusion.Pdf.Parsing

4. Use the following code snippet to replace fonts in the PDF document.

C#

//Load an existing PDF document
PdfLoadedDocument loadedDocument = new PdfLoadedDocument("Input.pdf");
 
//Replace font 
loadedDocument.UsedFonts[0].Replace(new PdfStandardFont(PdfFontFamily.Courier, 12));
 
//Save the document
loadedDocument.Save("ReplacedFontPDF.pdf");
 
//Close the document
loadedDocument.Close(true);
 
//This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("ReplacedFontPDF.pdf");

VB.NET

'Load an existing PDF document
Dim loadedDocument As New PdfLoadedDocument("Input.pdf")
 
'Replace font 
loadedDocument.UsedFonts(0).Replace(New PdfStandardFont(PdfFontFamily.Courier, 12))
 
'Save the document
loadedDocument.Save("ReplacedFontPDF.pdf")
 
'Close the document
loadedDocument.Close(True)
 
'This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("ReplacedFontPDF.pdf")

A complete working sample can be downloaded from ReplaceFontSample.zip.

Screenshot of the template document.

By executing a program, you will get the PDF document as follows.

Take a moment to peruse the documentation, where you can find other options like drawing text and multi-column text, consuming TrueType fonts, Standard fonts, and CJK fonts, and other features like form filling, extract text, images from PDF, and protect PDF documents with code examples.

Refer here to explore the rich set of Syncfusion Essential PDF features.

An online sample link to replace fonts from an existing PDF document.

Conclusion

I hope you enjoyed learning about how to replace fonts in WinForms PDF using C# and VB.NET.

You can refer to our WinForms PDF feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our 
WinForms PDF example to understand how to create and manipulate data.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our other controls.

If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!