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Common use cases

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Open a document

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Save a document

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Viewer

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UI Customization

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Annotations

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PDF.js Express REST API

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Saving a document as a blob

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 that has limited capabilities compared to PDF.js Express Pro

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PDF.js Express Plus

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PDF.js Express Plus is a paid product that supports annotating, signing, form filling and more

Documents can be exported from PDF.js Express by using the Document.getFileData API.

Please note that PDF.js Express does not have the ability to bake annotations into a PDF file on the client, so getFileData will not include annotations. For instructions on baking annotations into the document, please see this guide.

A use case for this may be saving a file a user has uploaded to your own server, allowing them to reuse it later.

The function can be used as follows:

Webviewer({
  ...options
}, document.getElementById('viewer')).then(instance => {

  const { docViewer } = instance;

  // must wait for the document to be loaded before you can save the file
  docViewer.on('documentLoaded', async () => {
    const documentStream = await docViewer.getDocument().getFileData({});
    const documentBlob = new Blob([documentStream], { type: 'application/pdf' });

    // Example function that saves a blob to the server
    saveBlobToServer(documentBlob);
  })
});
Webviewer({
  ...options
}, document.getElementById('viewer')).then(instance => {

  const { documentViewer } = instance.Core;

  // must wait for the document to be loaded before you can save the file
  documentViewer.addEventListener('documentLoaded', async () => {
    const documentStream = await documentViewer.getDocument().getFileData({});
    const documentBlob = new Blob([documentStream], { type: 'application/pdf' });

    // Example function that saves a blob to the server
    saveBlobToServer(documentBlob);
  })

});