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

Platform: WinForms |
Control: PDF

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. Create a console application project

Create new console application
  2. Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org. NuGet package reference

Install nuget packages
  3. Include the following namespaces in the Program.cs file.


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



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


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


//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
//Close the document
//This will open the PDF file so, the result will be seen in default PDF viewer



'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
'Close the document
'This will open the PDF file so, the result will be seen in default PDF viewer


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

Screenshot of the template document. Screenshot of output PDF file

By executing a program, you will get the PDF document as follows. Screenshot of output PDF file

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.


Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.





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