GroupDocs.Watermark for Python via .NET is a Python library designed for watermarking documents. Secure your sensitive data by putting text or images on various file formats as watermarks. Many customization options are available such as setting up text styles (bold, italic, font) or image properties like size or rotation to tune document watermarking. It supports wide range of file formats, including PDF, MS Office docs like Word, Excel, PowerPoint, and images such as JPEG, PNG, GIF, BMP, Visio diagrams, emails, etc.