Ink Annotation in Angular PDF Viewer component

7 May 202522 minutes to read

The PDF Viewer control provides the options to add, edit, and delete the ink annotations.

InkAnnotation

Adding an ink annotation to the PDF document

The ink annotations can be added to the PDF document using the annotation toolbar.

  • Click the Edit Annotation button in the PDF Viewer toolbar. A toolbar appears below it.
  • Select the Draw Ink button in the annotation toolbar. It enables the ink annotation mode.
  • You can draw anything over the pages of the PDF document.

InkTool

Refer to the following code sample to switch to the ink annotation mode.

import { Component, OnInit } from '@angular/core';
import { PdfViewerComponent, LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, FormDesignerService, FormFieldsService, 
         AnnotationService, PageOrganizerService,
       } from '@syncfusion/ej2-angular-pdfviewer';
  @Component({
    selector: 'app-root',
    // Specifies the template string for the PDF Viewer component.
    template: `<button (click)="addAnnotation()">Draw Ink</button>
                <div class="content-wrapper">
                <ejs-pdfviewer id="pdfViewer"
                              [documentPath]='document'
                              [resourceUrl] = 'resource'
                              style="height:640px;display:block">
                </ejs-pdfviewer>
                </div>`,
    providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
                 ThumbnailViewService, ToolbarService, NavigationService,
                 TextSearchService, TextSelectionService, PrintService, FormDesignerService, 
                 FormFieldsService, AnnotationService, PageOrganizerService]
    })
  export class AppComponent implements OnInit {
      public document: string = 'https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf';
      public resource: string = "https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2-pdfviewer-lib";
      ngOnInit(): void {
      }
      addAnnotation() {
          var pdfviewer = (<any>document.getElementById("pdfViewer")).ej2_instances[0];
          pdfviewer.annotationModule.setAnnotationMode("Ink");
      }
  }
import { Component, OnInit } from '@angular/core';
import { PdfViewerComponent, LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, FormDesignerService, FormFieldsService, 
         AnnotationService, PageOrganizerService,
       } from '@syncfusion/ej2-angular-pdfviewer';
  @Component({
    selector: 'app-root',
    // Specifies the template string for the PDF Viewer component.
    template: `<button (click)="addAnnotation()">Draw Ink</button>
                <div class="content-wrapper">
                <ejs-pdfviewer id="pdfViewer"
                              [serviceUrl]='service'
                              [documentPath]='document'
                              style="height:640px;display:block">
                </ejs-pdfviewer>
                </div>`,
    providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
                 ThumbnailViewService, ToolbarService, NavigationService,
                 TextSearchService, TextSelectionService, PrintService, FormDesignerService, 
                 FormFieldsService, AnnotationService, PageOrganizerService]
    })
  export class AppComponent implements OnInit {
      public service: string = 'https://services.syncfusion.com/angular/production/api/pdfviewer';
      public document: string = 'https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf';
      ngOnInit(): void {
      }
      addAnnotation() {
          var pdfviewer = (<any>document.getElementById("pdfViewer")).ej2_instances[0];
          pdfviewer.annotationModule.setAnnotationMode("Ink");
      }
  }

Adding a Ink annotation to the PDF document Programmatically

With the PDF Viewer library, you can add a Ink annotation to the PDF Viewer control programmatically using the addAnnotation() method.

Here’s a example of how you can utilize the addAnnotation() method to include a Ink annotation programmatically

import { Component, OnInit } from '@angular/core';
import { LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, FormDesignerService, FormFieldsService, 
         AnnotationService, PageOrganizerService, InkAnnotationSettings } from '@syncfusion/ej2-angular-pdfviewer';

@Component({
  selector: 'app-root',
  // specifies the template string for the PDF Viewer component
  template: `<div class="content-wrapper">
  <button (click)="addAnnotation()">Add Ink annotation Programmatically</button>
  <ejs-pdfviewer 
    id="pdfViewer" 
    [documentPath]='document' 
    [resourceUrl]='resource' 
    style="height:640px;display:block">
  </ejs-pdfviewer>
</div>`,
  providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
               ThumbnailViewService, ToolbarService, NavigationService,
               TextSearchService, TextSelectionService, PrintService,
               AnnotationService, FormDesignerService, FormFieldsService, PageOrganizerService]
})
export class AppComponent implements OnInit {
    public document = 'https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf';
    public resource: string = "https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2-pdfviewer-lib";
    ngOnInit(): void {
    }
    addAnnotation() {
      var pdfviewer = (<any>document.getElementById('pdfViewer')).ej2_instances[0];
      pdfviewer.annotation.addAnnotation("Ink", {
        offset: { x: 150, y: 100 },
        pageNumber: 1,
        width: 200,
        height: 60,
        path: 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    } as InkAnnotationSettings);
  }
}
import { Component, OnInit } from '@angular/core';
import { LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, FormDesignerService, FormFieldsService, 
         AnnotationService, PageOrganizerService, InkAnnotationSettings } from '@syncfusion/ej2-angular-pdfviewer';

@Component({
  selector: 'app-root',
  // specifies the template string for the PDF Viewer component
  template: `<div class="content-wrapper">
  <button (click)="addAnnotation()">Add Ink annotation Programmatically</button>
  <ejs-pdfviewer 
    id="pdfViewer" 
    [documentPath]='document' 
    [serviceUrl]='service' 
    style="height:640px;display:block">
  </ejs-pdfviewer>
</div>`,
  providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
               ThumbnailViewService, ToolbarService, NavigationService,
               TextSearchService, TextSelectionService, PrintService,
               AnnotationService, FormDesignerService, FormFieldsService, PageOrganizerService]
})
export class AppComponent implements OnInit {
    public document = 'https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf';
    public service: string = 'https://services.syncfusion.com/angular/production/api/pdfviewer';
    ngOnInit(): void {
    }
    addAnnotation() {
      var pdfviewer = (<any>document.getElementById('pdfViewer')).ej2_instances[0];
      pdfviewer.annotation.addAnnotation("Ink", {
        offset: { x: 150, y: 100 },
        pageNumber: 1,
        width: 200,
        height: 60,
        path: 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    } as InkAnnotationSettings);
  }
}

Edit the existing Ink annotation programmatically

To modify existing Ink annotation in the Syncfusion® PDF viewer programmatically, you can use the editAnnotation() method.

Here is an example of how you can use the editAnnotation() method:

import { Component, OnInit } from '@angular/core';
import { LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, FormDesignerService, FormFieldsService, 
         AnnotationService, PageOrganizerService } from '@syncfusion/ej2-angular-pdfviewer';

@Component({
  selector: 'app-root',
  // specifies the template string for the PDF Viewer component
  template: `<div class="content-wrapper">
  <button (click)="editAnnotation()">Edit ink annotation</button>
  <ejs-pdfviewer 
    id="pdfViewer" 
    [documentPath]='document' 
    [resourceUrl]='resource' 
    style="height:640px;display:block">
  </ejs-pdfviewer>
</div>`,
  providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
               ThumbnailViewService, ToolbarService, NavigationService,
               TextSearchService, TextSelectionService, PrintService,
               AnnotationService, FormDesignerService, FormFieldsService, PageOrganizerService]
})
export class AppComponent implements OnInit {
    public document = 'https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf';
    public resource: string = "https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2-pdfviewer-lib";
    ngOnInit(): void {
    }
    editAnnotation() {
      var viewer = (<any>document.getElementById('pdfViewer')).ej2_instances[0];
      for (let i = 0; i < viewer.annotationCollection.length; i++) 
      {
        if (viewer.annotationCollection[i].shapeAnnotationType === "Ink") {
          var width = viewer.annotationCollection[i].bounds.width;
          var height = viewer.annotationCollection[i].bounds.height;
          viewer.annotationCollection[i].bounds = {x : 100, y: 100, width: width, height: height }; 
          viewer.annotationCollection[i].strokeColor = "#0000FF";
          viewer.annotationCollection[i].thickness = 2 ;
          viewer.annotationCollection[i].annotationSelectorSettings.resizerShape = "Circle"
          viewer.annotation.editAnnotation(viewer.annotationCollection[i]);
        }
      }
    }
}
import { Component, OnInit } from '@angular/core';
import { LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, FormDesignerService, FormFieldsService, 
         AnnotationService, PageOrganizerService } from '@syncfusion/ej2-angular-pdfviewer';

@Component({
  selector: 'app-root',
  // specifies the template string for the PDF Viewer component
  template: `<div class="content-wrapper">
  <button (click)="editAnnotation()">Edit ink annotation</button>
  <ejs-pdfviewer 
    id="pdfViewer" 
    [documentPath]='document' 
    [serviceUrl]='service' 
    style="height:640px;display:block">
  </ejs-pdfviewer>
</div>`,
  providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
               ThumbnailViewService, ToolbarService, NavigationService,
               TextSearchService, TextSelectionService, PrintService,
               AnnotationService, FormDesignerService, FormFieldsService, PageOrganizerService]
})
export class AppComponent implements OnInit {
    public document = 'https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf';
    public service: string = 'https://services.syncfusion.com/angular/production/api/pdfviewer';
    ngOnInit(): void {
    }
    editAnnotation() {
      var viewer = (<any>document.getElementById('pdfViewer')).ej2_instances[0];
      for (let i = 0; i < viewer.annotationCollection.length; i++) 
      {
        if (viewer.annotationCollection[i].shapeAnnotationType === "Ink") {
          var width = viewer.annotationCollection[i].bounds.width;
          var height = viewer.annotationCollection[i].bounds.height;
          viewer.annotationCollection[i].bounds = {x : 100, y: 100, width: width, height: height }; 
          viewer.annotationCollection[i].strokeColor = "#0000FF";
          viewer.annotationCollection[i].thickness = 2 ;
          viewer.annotationCollection[i].annotationSelectorSettings.resizerShape = "Circle"
          viewer.annotation.editAnnotation(viewer.annotationCollection[i]);
        }
      }
    }
}

Editing the properties of the ink annotation

The stroke color, thickness, and opacity of the ink annotation can be edited using the Edit stroke color tool, Edit thickness tool, and Edit opacity tool in the annotation toolbar.

Editing stroke color

The stroke color of the annotation can be edited using the color palette provided in the Edit Stroke Color tool.

InkStrokeColor

Editing thickness

The thickness of the border of the annotation can be edited using the range slider provided in the Edit Thickness tool.

InkThickness

Editing opacity

The opacity of the annotation can be edited using the range slider provided in the Edit Opacity tool.

InkOpacity

Setting default properties during the control initialization

The properties of the ink annotation can be set before creating the control using the InkAnnotationSettings.

After editing the default values, they will be changed to the selected values.
Refer to the following code sample to set the default ink annotation settings.

import { Component, OnInit } from '@angular/core';
import { PdfViewerComponent, LinkAnnotationService, BookmarkViewService,
         MagnificationService, ThumbnailViewService, ToolbarService,
         NavigationService, TextSearchService, TextSelectionService,
         PrintService, AnnotationService
       } from '@syncfusion/ej2-angular-pdfviewer';
@Component({
  selector: 'app-root',
  // Specifies the template string for the PDF Viewer component.
  template: `<div class="content-wrapper">
              <ejs-pdfviewer id="pdfViewer"
                    [documentPath]='document'
                    [resourceUrl] = 'resource'
                    [inkAnnotationSettings]='inkAnnotationSettings'
                    style="height:640px;display:block">
              </ejs-pdfviewer>
            </div>`,
  providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
               ThumbnailViewService, ToolbarService, NavigationService,
               TextSearchService, TextSelectionService, PrintService,
               AnnotationService]
  })
  export class AppComponent implements OnInit {
      public document: string = 'https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf';
      public resource: string = "https://cdn.syncfusion.com/ej2/25.1.35/dist/ej2-pdfviewer-lib";
      public inkAnnotationSettings = { author: 'Syncfusion', strokeColor: 'green', thickness: 3, opacity: 0.6 }
      ngOnInit(): void {
      }
  }
import { Component, OnInit } from '@angular/core';
  import { PdfViewerComponent, LinkAnnotationService, BookmarkViewService,
           MagnificationService, ThumbnailViewService, ToolbarService,
           NavigationService, TextSearchService, TextSelectionService,
           PrintService, AnnotationService
         } from '@syncfusion/ej2-angular-pdfviewer';
  @Component({
    selector: 'app-root',
    // Specifies the template string for the PDF Viewer component.
    template: `<div class="content-wrapper">
                <ejs-pdfviewer id="pdfViewer"
                      [serviceUrl]='service'
                      [documentPath]='document'
                      [inkAnnotationSettings]='inkAnnotationSettings'
                      style="height:640px;display:block">
                </ejs-pdfviewer>
              </div>`,
    providers: [ LinkAnnotationService, BookmarkViewService, MagnificationService,
                 ThumbnailViewService, ToolbarService, NavigationService,
                 TextSearchService, TextSelectionService, PrintService,
                 AnnotationService]
    })
    export class AppComponent implements OnInit {
        public service: string = 'https://services.syncfusion.com/angular/production/api/pdfviewer';
        public document: string = 'https://cdn.syncfusion.com/content/pdf/pdf-succinctly.pdf';
        public inkAnnotationSettings = { author: 'Syncfusion', strokeColor: 'green', thickness: 3, opacity: 0.6 }
        ngOnInit(): void {
        }
    }