Remove Watermark Annotations in PDF document via C#

Work with annotations using the Aspose.PDF for .NET. Annotations are digital notes, comments, highlights, or other graphical elements that can be added to a PDF file to provide additional information or interact with the content. Add Watermark annotations to PDF using the Aspose.PDF for .NET. Adding annotations to a PDF file provides the usability and interactivity of the document, and improves presentations when using your document as a visual aid. Adding annotations to PDF can be used to create navigation tools, allowing users to access specific sections, websites, or external resources. Extracting annotations allows users to review comments, feedback, or notes made by others on the document, facilitating collaboration and discussion. The ability to get annotations from a document is necessary when working with large volumes of documents. The Aspose.PDF for .NET library can get annotations from PDF in a few steps. Annotations may contain private information. Removing Watermark annotations is necessary to ensure that such information is not unintentionally shared when sharing the PDF with others. Annotations may reveal data or information that needs to be protected for privacy reasons. Removing annotations helps safeguard data privacy. Annotations, especially excessive or outdated ones, can clutter a document and make it visually unappealing or harder to read. Removing Watermark annotations can enhance the overall document’s readability. In order to annotate PDF file, we’ll use Aspose.PDF for .NET API which is a feature-rich, powerful and easy to use document manipulation API for C# platform. Open NuGet package manager, search for Aspose.PDF and install. You may also use the following command from the Package Manager Console.

PM > Install-Package Aspose.PDF

    // Load the PDF file
    Document document = new Document(System.IO.Path.Combine(_dataDir, "sample_Watermark.pdf"));
    var WatermarkAnnotations = document.Pages[1].Annotations
        .Where(a => a.AnnotationType == AnnotationType.Watermark)
        .Cast<WatermarkAnnotation>();

    foreach (var ca in WatermarkAnnotations)
    {
        document.Pages[1].Annotations.Delete(ca);
    }
    document.Save(System.IO.Path.Combine(_dataDir, "sample_Watermark_del.pdf"));