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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (PdfDocument doc = Document.Load<PdfDocument>(Utilities.MapSourceFilePath(FilePath)))
{
    foreach (PdfPage page in doc.Pages)
    {
        for (var i = page.Artifacts.Count - 1; i >= 0; i--)
        {
            foreach (var fragment in page.Artifacts[i].FormattedTextFragments)
            {
                if (fragment.Font.Size > 42)
                {
                    page.Artifacts.RemoveAt(i);
                    break;
                }
            }
        }
    }
    doc.Save();
}