// 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();
}