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Watermark for Net

Watermark documents easily in your C# .NET applications

Empower your C# solutions with a flexible document watermarking API that provides adding customizable watermarks to all popular document formats.

Free NuGet Download Licensing

Version released

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// Instantiate Watermarker passing PDF path
PdfLoadOptions loadOptions = new PdfLoadOptions();
using (Watermarker watermarker = 
    new Watermarker("source.pdf", loadOptions))
{
    // Customize watermark options
    TextWatermark textWatermark = 
        new TextWatermark("Approved", new Font("Arial", 8));
    
    // Apply watermark to PDF document
    watermarker.Add(textWatermark);

    // Save result document
    watermarker.Save("result.pdf");
}

dotnet add package GroupDocs.Watermark

GroupDocs.Watermark at a glance

API to put watermarks on documents via .NET

C# files watermark

Add watermarks to your business files using GroupDocs.Watermark. Use text, images, diagrams or email attachments.

Customize watermarks to your goals

GroupDocs.Watermark for .NET software allows to customize watermarks in various ways. Text styles like bold, italic, font types along with image properties like rotation etc. enrich watermarking process.

All popular file formats are supported

Many file and document formats are supported by GroupDocs.Watermark solution. PDF, Microsoft Office Word, Excel, PowerPoint, images like JPEG, PNG, GIF, BMP, Visio diagrams, emails etc. could be protected with our watermarks.

Search and update watermarks

Watermarks which are already presented in a document may be found and processed again. Modify text, style, images or remove revealed watermarks without extra efforts.

Platform independence

GroupDocs.Watermark for .NET supports operating systems, frameworks and package managers listed below

Supported file formats

GroupDocs.Watermark for .NET provides processing of the following file formats.

Microsoft Office & 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 & 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 features

Protect PDF, Office, Images and other formats by watermark

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 & shapes

Set Watermark to all Attachments in an Excel Document & 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 & Other Information for Supported Formats.

Code samples

Some use cases of typical GroupDocs.Watermark for .NET operations

Watermark by adding an image to a document.

To protect any document you can use image watermarks:

How to protect file by image watermark.

// Load source document to Watermarker
using (Watermarker watermarker = new Watermarker("document.pdf"))
{
    // Specify path to a watermark image
    using (ImageWatermark watermark = new ImageWatermark("watermark.jpg"))
    {
        // Protect the file and save it
        watermarker.Add(watermark);

        watermarker.Save("result.pdf");
    }
}

Search and modify existing watermarks.

GroupDocs.Watermark is able to modify watermarks that are already presented in a document. Search for desired items and update their properties.

Watermarks search & modification.

// Load source document
using (Watermarker watermarker = new Watermarker("document.pdf"))
{
    // Search for watermarks to be updated
    TextSearchCriteria searchCriteria = new TextSearchCriteria("test", false);
    PossibleWatermarkCollection watermarks = watermarker.Search(searchCriteria);
    foreach (PossibleWatermark watermark in watermarks)
    {
        // Update desired properties
        watermark.Text = "New Text";
    }

    // Save modified document to a specified path
    watermarker.Save("document.pdf");
}