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Professional PDF.js Viewing & Annotations - Try for free

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PDF.js Express REST API

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Create rectangle annotations in PDF.js Express

The following features are available in:

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PDF.js Express Viewer

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PDF.js Express Viewer is a free viewer with limited capabilities compared to PDF.js Express Plus

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PDF.js Express Plus

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PDF.js Express Plus is a commercial PDF SDK for viewing, annotating, signing, form filling and more

Here is an example of creating a rectangle annotation, but creating other types of annotations are similar.

WebViewer(...)
  .then(instance => {
    const { Annotations, annotManager, docViewer } = instance;

    docViewer.on('documentLoaded', () => {
      const rectangleAnnot = new Annotations.RectangleAnnotation();
      rectangleAnnot.PageNumber = 1;
      // values are in page coordinates with (0, 0) in the top left
      rectangleAnnot.X = 100;
      rectangleAnnot.Y = 150;
      rectangleAnnot.Width = 200;
      rectangleAnnot.Height = 50;
      rectangleAnnot.Author = annotManager.getCurrentUser();

      annotManager.addAnnotation(rectangleAnnot);
      // need to draw the annotation otherwise it won't show up until the page is refreshed
      annotManager.redrawAnnotation(rectangleAnnot);
    })
  })
WebViewer(...)
  .then(instance => {
    const { 
      Annotations, 
      annotationManager, 
      documentViewer 
    } = instance.Core;

    documentViewer.addEventListener('documentLoaded', () => {
      const rectangleAnnot = new Annotations.RectangleAnnotation();
      rectangleAnnot.PageNumber = 1;
      // values are in page coordinates with (0, 0) in the top left
      rectangleAnnot.X = 100;
      rectangleAnnot.Y = 150;
      rectangleAnnot.Width = 200;
      rectangleAnnot.Height = 50;
      rectangleAnnot.Author = annotationManager.getCurrentUser();

      annotationManager.addAnnotation(rectangleAnnot);
      // need to draw the annotation otherwise it won't show up until the page is refreshed
      annotationManager.redrawAnnotation(rectangleAnnot);
    })
  })

Other examples

Creating stamp annotations
To create a stamp annotation.

Creating free text annotations
To create a free text annotation.

Creating highlight annotations
To create a highlight annotation.

Creating file attachment annotations
To create a file attachment annotation.

Creating custom annotations
To create a customized annotation.