Supported file formats

Microsoft Office and OpenDocument formats

• Portable: PDF
• Word: DOC, DOCM, DOCX, DOT, DOTM, DOTX, RTF
• Excel: XLSX, XLS, XLT, XLTM, XLSB, XLSM
• PowerPoint: PPTX, PPT, PPTM, POTX, POTM, PPSM, PPSX
• OpenDocument: ODT, ODP, ODS

Images and Graphics

• Popular image formats: BMP, JPG, JPEG, PNG
• Multi-page images: GIF, WEBP, TIFF

Other

• Outlook: EML, EMLX, MSG, OFT
• Microsoft Visio: VSDX, VSTX, VSSX, VSDM, VSSM, VSTM, VSD, VDX, VSX, VTX, VSS, VST, VDW

GroupDocs.Watermark for .NET features

• Documents watermarking - Add or Remove Watermarks from a Particular Section or whole Document of Various File Formats.
• Style your watermark - Customize various watermark properties like color, font, rotation etc.
• PDF hidden printing watermark - Allocate Hidden Watermark to PDF that only Appears when Printing Document.
• Watermark only images in documents - Watermark all Images in a Particular Section, Page, Slide, or Document.
• Process selected image frames - Assign Watermark to only Particular Frames of a Multi-Framed Image.
• Attachments and shapes - Set Watermark to all Attachments in an Excel Document and all Image Shapes in Slides.
• PDF objects - Align Watermark to Bleed Box, Art Box, Crop Box, or Trim Box in PDF Document.
• Documents background - Place Watermark or Remove it from the Background Images of Spreadsheet or Slides.
• Unreadable Characters Protection - Protect Text Watermark using Unreadable Characters in Presentations.
• Search Watermarks in Documents - Search Watermarks Based on Specific Parameters or by Combining Multiple Criteria.
• Search similar image watermarks - Look for Image Watermarks that Resemble a Particular Image.
• Get document information - Programmatically Extract Page Setup and Other Information for Supported Formats.