I need a straightforward utility that can reliably move files back and forth between PDF and three key formats: Word (DOCX), Excel (XLSX) and common images (JPEG/PNG). Alongside the core conversion, it must also: • merge several PDFs into one • split a PDF into separate files by page range • add a simple text or image watermark before saving No on-screen editing is required once the file is converted—the tool just needs to process and save. A clean, intuitive interface, clear status messages and error handling are important so non-technical users can run conversions in batches without drama. Source code, a brief set-up guide and any third-party library references should be included with delivery so the utility can be updated internally later on.