1. GroupDocs Documentation
    2. /
    3. GroupDocs.Watermark Product Family
    4. /
    5. GroupDocs.Watermark for .NET
    6. /
    7. Getting started
    8. /
    9. Features overview

    Features overview

    Watermark

    A watermark is an image or text that is intentionally superimposed onto document or image. Its purpose is to make it more difficult for the original document or image to be copied or used without permission.

    GroupDocs.Watermark for .NET API presents a wide range of features related to watermark. Some key features are listed below.

    1. Adding text/image watermark to supported document formats
    2. Searching and removing text/image watermark in supported document formats
    3. Searching watermarks in particular objects
    4. Adding watermark to images inside a document
    5. Modifying existing watermark objects in supported document formats
    6. Extracting information of watermark objects in a document
    7. PDF document rasterization
    8. Getting document information
    9. Searching watermarks by text formatting (font, color etc)
    10. Modifying hyperlinks associated with document entities (all formats)
    11. Setting background image for charts in Excel and PowerPoint document
    12. Modifying PDF and email attachments
    13. Using Dynabic.Metered account to use API in licensed mode

    Add watermark

    Following are the watermark types that can be added to each supported document format.

    Document FormatWatermark Type
    PDFXObject (image and text)
    Artifact (image and text) 
    Annotation (image and text)
    WordShape (image and text)
    ExcelShape (image and text)
    Header & Footer (image and text)
    Background image
    PowerPointShape (image and text)
    VisioShape (image and text)
    Raster Image FormatsText
    Image
    Multi-page TIFFText
    Image
    Animated GIFText
    Image

    Search watermark

    Following are the watermark types that can be found using GroupDocs.Watermark.

    FormatWatermark type
    PDFXObject (image and text)
    Artifact (image and text)
    Annotation (image and text)
    Regular text
    WordShape (image and text)
    Regular text
    Hyperlinks
    ExcelShape (image and text)
    Header&Footer (image and text)
    Background image
    Text and formulas in cells
    Hyperlinks
    PowerPointShape (image and text)
    Hyperlinks
    VisioShape (image and text)
    Diagram comments
    Hyperlinks
    EmailAttached and embedded images
    Subject and body text fragments

    Remove watermark

    Following are the watermark types that can be removed using GroupDocs.Watermark.

    FormatWatermark type
    PDFXObject (image and text)
    Artifact (image and text)
    Annotation (image and text)
    Regular text
    WordShape (image and text)
    Regular text
    Hyperlinks
    ExcelShape (image and text)
    Header&Footer (image and text)
    Background image
    Text and formulas in cells
    Hyperlinks
    PowerPointShape (image and text)
    Hyperlinks
    VisioShape (image and text)
    Diagram comments
    Hyperlinks
    EmailAttached and embedded images
    Subject and body text fragments

    Document information extraction

    GroupDocs.Watermark allows obtaining basic information about source document - file type, size, pages count, page height and width etc.
    This may be quite useful for generating document preview and precise watermark placing inside document.

    Preview document pages

    Document preview feature allows generating image representations of document pages. This may be helpful for better understanding about document content and its structure,
    set proper watermark position inside document, apply appropriate watermark styling etc. Preview can be generated for all document pages (by default) or for specific page numbers or page range.

    Supported image formats for document preview are:

    • PNG;
    • JPG;
    • BMP.
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