GroupDocs.Watermark for .NET provides robust capabilities to add, detect, customize, and remove watermarks across 40+ file formats, including PDFs, Word, Excel, and images....Watermark Word® (DOC, DOCX), Excel® (XLS, XLSX), and PowerPoint® (PPT...Spreadsheet Template ✔️ ✔️ ✔️ ✔️ ✔️ XLS Excel® Workbook 97-2003 ✔️ ✔️...