How to convert PDF to PDF/A-1b in .NET Core

The Syncfusion Essential® PDF is a .NET Core PDF library used to create, read, and edit PDF documents. Using this library, you can convert PDF to PDF/A-1b, PDF/A-2b, and PDF/A3-b in ASP.NET Core.

Steps to convert PDF to PDF/A-1b document in ASP.NET Core using C#

1. Create a new ASP.NET Core console application.

2. Install the Syncfusion.Pdf.Imaging.Net.Core NuGet package as a reference to your .NET Core project from NuGet.org.

3. Install the SkiaSharp NuGet package as a reference to your .NET Core project from NuGet.org.

4. Include the following namespaces in the Program.cs file.

   using SkiaSharp;
   using Syncfusion.Pdf;
   using Syncfusion.Pdf.Graphics;
   using Syncfusion.Pdf.Parsing;
   using System.IO;
   

5. Include the following code sample to convert PDF to PDF/A-1b using C#.

   //Load an existing PDF document.
   FileStream docStream = new FileStream(@"../../../Input.pdf", FileMode.Open, FileAccess.Read);
   PdfLoadedDocument loadedDocument = new PdfLoadedDocument(docStream);
   //Sample level font event handling.
   loadedDocument.SubstituteFont += LoadedDocument_SubstituteFont;
   //Convert the loaded document into PDF/A document.
   loadedDocument.ConvertToPDFA(PdfConformanceLevel.Pdf_A1B);
   MemoryStream stream = new MemoryStream();
   //Save the document.
   loadedDocument.Save(stream);
   stream.Position = 0;
   FileStream filestream = new FileStream("../../../Output.pdf", FileMode.OpenOrCreate, FileAccess.ReadWrite);
   stream.WriteTo(filestream);
   //Close the document.
   loadedDocument.Close(true);
   

//Substitute the non-embedded fonts.
static void LoadedDocument_SubstituteFont(object sender, PdfFontEventArgs args)
{
//Get the font name.
 
string fontName = args.FontName.Split(',')[0];
 
//Get the font style.
 
PdfFontStyle fontStyle = args.FontStyle;
 
SKFontStyle sKFontStyle = SKFontStyle.Normal;
 
if (fontStyle != PdfFontStyle.Regular)
{
if (fontStyle == PdfFontStyle.Bold)
{
sKFontStyle = SKFontStyle.Bold;
}
else if (fontStyle == PdfFontStyle.Italic)
{
sKFontStyle = SKFontStyle.Italic;
}
else if (fontStyle == (PdfFontStyle.Italic | PdfFontStyle.Bold))
{
sKFontStyle = SKFontStyle.BoldItalic;
}
}
SKTypeface typeface = SKTypeface.FromFamilyName(fontName, sKFontStyle);
 
SKStreamAsset typeFaceStream = typeface.OpenStream();
 
MemoryStream memoryStream = null;
 
if (typeFaceStream != null && typeFaceStream.Length > 0)
{
//Create a fontData from the type face stream.
byte[] fontData = new byte[typeFaceStream.Length - 1];
typeFaceStream.Read(fontData, typeFaceStream.Length);
typeFaceStream.Dispose();
//Create a new memory stream from the font data.
memoryStream = new MemoryStream(fontData);
}
//Set the font stream to the event args.
args.FontStream = memoryStream;
}

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

A complete work sample can be downloaded from PDFToPDFA1b_Sample.zip.

Take a moment to peruse the documentation. You will also find other options like create PDF/A-1b and PDF/X-1a document and features like converting Word to PDF, Excel to PDF, and HTML to PDF with code examples.

​Refer to this link to explore the rich set of Syncfusion Essential® PDF features.

An online sample link to convert PDF to PDF/A-1b standard document.

Also see:

https://help.syncfusion.com/file-formats/pdf/working-with-pdf-conformance

https://www.syncfusion.com/kb/9515/how-to-convert-pdf-to-pdf-a-1b-using-c-and-vb-net