GroupDocs.Watermark Overview Leave feedback

GroupDocs.Watermark for .NET is a powerful and flexible API that helps developers add, search, edit, or remove watermarks from documents and images across more than 50 file formats.

Whether you need to add a confidential watermark, apply invisible tracking for sensitive content, or automate watermarking at scale, GroupDocs.Watermark offers the features and precision control you need — without relying on external software like Microsoft Office or Adobe Acrobat.

• Documents: PDF, DOCX/DOC, RTF
• Presentations: PPTX/PPT
• Spreadsheets: XLSX/XLS
• Images: JPG, PNG, TIFF, GIF, and more

• Add text watermarks or image watermarks to documents or images
• Remove watermarks even if they were added by third-party tools
• Detect and remove watermarks based on text, font, or formatting
• Protect watermarks from editing by locking them in the content structure

• Set custom font, color, opacity, and positioning
• Apply watermarks to specific pages, slides, sections, or frames
• Align watermark to bleed box, crop box, art box, or trim box in PDFs
• Replace existing watermark text with updated formatting

• Add invisible watermarks that only appear during printing
• Add tracking watermarks for audit or copyright protection
• Use OCR-like detection to find obfuscated or hidden text watermarks
• Match image-based watermarks using visual similarity

• Add watermarks to:
  • All headers and footers
  • All attachments in PDFs or emails
  • All image shapes in presentations or Word documents
• Rasterize content to protect watermarks from extraction
• Automatically find and process watermarks in multi-layered or structured content

💡 You can use GroupDocs.Watermark for:

• Adding a Confidential watermark before sending internal files
• Protecting content with invisible watermarks for IP tracking
• Automating watermarking of PDF invoices or Excel reports
• Removing unwanted watermarks from third-party documents
• Inserting company logos or custom stamps on Word or PowerPoint slides

Use the Watermarker.Remove() method to delete both visible and invisible watermarks. You can target specific types using watermark search filters.

Yes, you can add text or image watermarks to all slides or selected ones in PPT/PPTX files.

To add a diagonal watermark, set the desired rotation angle (e.g., 45 degrees) using the RotationAngle property. To repeat the watermark across the page, enable tiling with the TileOptions. You can also customize the watermark’s position, font, opacity, and size to achieve a polished, professional appearance.

• How to add a watermark to a document
• How to remove watermark from PDF
• Supported File Formats
• Code Examples Gallery

Start protecting your content today with GroupDocs.Watermark for .NET — the complete solution for secure, flexible, and automated document watermarking.