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Editing PDF metadata with Nutrient .NET SDK

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PDF metadata carries a document’s identity — its title, author, and other descriptive fields that search engines, document management systems, and PDF viewers read. Editing metadata programmatically keeps large document libraries consistent without manual work in a PDF editor.

Use programmatic metadata editing to:

  • Normalize author and title fields across a document library.
  • Stamp generated documents with product or organization identity.
  • Correct metadata before archiving or distribution.

Edit PDF metadata with the .NET SDK

You can read and write PDF metadata in a .NET application with the Nutrient .NET SDK. The SDK edits the document in place and saves a new file, so the original stays untouched.

Prepare the project

Start by importing the Nutrient namespace:

using Nutrient;

Load the PDF document and create an editor

Open the source document, then create a PdfEditor for it. The editor exposes the document’s metadata object:

try
{
    using Document document = Document.Open("input.pdf");
    using PdfEditor editor = PdfEditor.Edit(document);

Update the metadata fields

Fetch the metadata object and set the fields you want to change:

    var metadata = editor.Metadata;
    metadata.Author = "New author value";
    metadata.Title = "New title value";

The metadata object also exposes subject, keywords, creator, and producer through the corresponding properties.

Save the edited document

Write the result to a new file:

    editor.SaveAs("output.pdf");
    Console.WriteLine("Successfully edited metadata");
}
catch (NutrientException e)
{
    Console.Error.WriteLine($"Error: {e.Message}");
    Environment.Exit(1);
}

Handle errors

Nutrient .NET SDK uses exception handling for errors. The methods in this guide throw a NutrientException if a failure occurs. The using statements release the editor and document handles even when a step fails.

Conclusion

You’ve edited PDF metadata and saved the result as a new document. The same editor object supports page manipulation and other document editing operations.