Documents for PDF .NET Edition
GrapeCity Documents PDF Viewer / Edit PDF / Editors / Annotation Editor
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    Annotation Editor
    In This Topic

    The Annotation editor in GcDocs PDF Viewer allows you to edit and review PDF documents. You can add or remove different types of annotations, comment or reply on comments and set or modify annotation properties like text, color, position, border, style etc. Along with the Annotation editor's toolbar, you can access all the annotations and various other options through the the main toolbar. It provides editing tools which allow you to quickly perform edit operations without the need of switching into full editing mode.  

    The editing tools displayed in the below screenshots provide the annotation options along with 'Undo, Redo and Delete' and Redact options in the quick editing toolbars.

    Text Tools

    On clicking the Text tools button, the quick editing toolbar appears which displays various related text annotation tools like sticky note, free text, ink annotation etc.

    Draw Tools

    On clicking the Draw tools button, the quick editing toolbar appears which displays various draw annotation tools like square, circle, line annotation etc.

    Attachments and Stamps

    On clicking the Attachments and stamps button, the quick editing editor toolbar appears which displays various attachment and stamp tools like stamp annotation, file attachment , signature tool etc. Stamp annotation also supports rotation through Rotate property or the rotation handle attached to the annotation. For more information, see "Stamp Rotation".

    Page Tools

    On clicking the Page tools button, the quick editing editor toolbar appears which displays various page related options like adding a new blank document, inserting a blank page, deleting current page and perform undo or redo operations.

    The Form tools button in the above toolbar provides various form field buttons. To know more, refer Form Editor.

    Note: The editing tools (explained above) are automatically enabled in the main toolbar when SupportApi is configured in the project (which allows editing operations in a PDF document).

    You can also configure which tools should be displayed in the second toolbar by using the secondToolbarLayout property as shown below:

    Copy Code
    const secondToolbarLayout = viewer.secondToolbarLayout;
    secondToolbarLayout["text-tools"] = ['edit-text', 'edit-free-text'];

    The output of above code will look like below:

    You can also customize the second toolbar by using the render handler for secondToolbar option:

    Copy Code
    var React = viewer.getType("React");
    // Create custom toolbar controls:
    var toolbarControls = [React.createElement("label", { style: { color: "white" } }, "Custom toolbar"),
    React.createElement("button", { className: "gc-btn gc-btn--accent", onClick: () => { alert("Execute action."); }, title: "Action title" }, "Action")];
    // Register custom second toolbar for key "custom-toolbar-key":
    viewer.options.secondToolbar = {
        render: function (toolbarKey) {
            if (toolbarKey === "custom-toolbar-key")
                return toolbarControls;
            return null;
    // Show custom second toolbar:

    The output of above code will look like below:

    Alternatively, you can access all the available annotations through the Annotation editor's toolbar which opens on clicking the Annotation editor button in the side panel. The below image shows Annotation editor and its toolbar in GcDocs PDF Viewer with a PDF document containing a Text annotation.

    Annotation editor in GcDocs PDF Viewer

    The different toolbar buttons are described as below. To know more about different annotations, refer Annotation Types.

    Name Toolbar Icons Description
    Select Annotation icon Select an annotation added on PDF
    Signature Tool Signature icon Adds graphical signatures on the PDF
    Sticky Note Sticky note icon Adds text or sticky notes on the PDF
    Free Text Annotation Note icon Adds a note that is always visible on the PDF
    Ink Annotation Draw icon Draws free-hand scribble on the PDF
    Square Annotation Rectangle icon Adds a rectangle shape on PDF
    Circle Annotation Circle icon Adds a circle shape on the PDF
    Line Annotation Line icon Adds a straight line on the PDF
    PolyLine Annotation Shapes icon Adds closed or open shapes of multiple edges on the PDF
    Polygon Annotation Polygon icon Adds a polygon on the PDF
    Stamp Annotation Stamp Annotation icon Adds image on the PDF
    File Attachment Annotation File attachment icon Attaches a file to the document, which will be embedded in the PDF
    Sound Annotation Sound icon Adds sound (.au, .aiff, or .wav format) imported from a file or recorded from the computer’s microphone
    Link Annotation Sound icon Adds link on the PDF
    Delete Annotation Button Delete annotation icon Deletes the annotation
    Redact Annotation Mark region icon Marks region on PDF document to be redacted
    Apply Redact Annotation Apply redeact icon Applies redact to all regions marked for redact

    Note: All the above mentioned annotations are supported in GcDocs PDF Viewer. The below annotations are explained in detail in following topics:

    Apart from the different types of annotations described above, GcDocs PDF Viewer also provides some general editing features while working with PDF documents. They are explained as below:

    Toolbar Icons Description
    Undo icon Undo changes
    Redo icon Redo changes
    Save icon Saves the modified document on client
    Create new doc icon Creates a new blank document
    Insert blank page icon Inserts a blank page
    Delete page icon Deletes current page
    Note: You can view the original PDF document at any point of time by using the 'Hide Annotations' button on the main toolbar.

    You can also insert a blank page in a PDF document and set its size by using the newPage method. Alternatively, you can only set the size of an existing page using setPageSize method as shown below:

    Copy Code"AcmeFinancialReport.pdf");
          //Add new page at second position and set its size
          viewer.newPage({height:400, pageIndex:1, width:300});
          //Set page size for the first page
          viewer.setPageSize(0, { width: 300, height: 500 });

    Property Panel of Annotation Editor

    When you click the Annotation editor icon in the left vertical panel, the Property panel of the Annotation editor becomes visible. The Property panel displays the list of all the annotations page-wise in your document.

    It also allows you to set or modify properties of any annotation in the document like its text, color, border location etc. For eg. The image below shows the properties of a square annotation in the Property panel.


    Property Panel of Annotation Editor

    Enable Annotation Editor in GcDocs PDF Viewer

    The Annotation editor is displayed by default in GcDocs PDF Viewer, by enabling the AnnotationEditorPanel in the viewer using code:

    Copy Code
        var viewer = new GcPdfViewer("#host", { supportApi: 'SupportApi/GcPdfViewer' });
        viewer.beforeUnloadConfirmation = true;"Home/GetPdf");


    To customize the annotation options in GcDocs PDF Viewer, add the following lines of code in the class file where you load the PDF in the Viewer:

    Copy Code
    public static GcPdfViewerSupportApiDemo.Models.PdfViewerOptions PdfViewerOptions
            get => new GcPdfViewerSupportApiDemo.Models.PdfViewerOptions(
            GcPdfViewerSupportApiDemo.Models.PdfViewerOptions.Options.AnnotationEditorPanel |
            annotationEditorTools: new string[] { "edit-select", "$split", "edit-text", "edit-free-text", "$split", "edit-erase", "$split", "edit-redact", "edit-redact-apply", "$split", "edit-undo", "edit-redo", "save" });

    Review PDF document using Annotation editor

    Follow the below steps to review a PDF document using the annotation editor in GcDocs PDF Viewer:

    1. Configure the GcDocs PDF Viewer for editing PDF documents.
    2. Run the application and open the PDF you want to review using the Open button.
    3. Open the Annotation Editor using the second last icon on the left vertical toolbar.
    4. Choose any annotation from the different annotations available in the toolbar at the top.
    5. Use that annotation to mark a correction in your document.
    6. Set annotation properties from the Property panel like color, border etc.
    7. Add a Text annotation and type the final review text.
    8. Close the Annotation editor and go back to View mode.

    The annotations are successfully added annotations to the document. You can also view the list of all the annotations in the property panel of Annotation Editor. 

     GcDocs PDF Viewer

    For more information, refer Annotation Editor in GcDocs PDF Viewer demos.