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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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Collaboration

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Forms

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Signature

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Measurement

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PDF.js Express REST API

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Open a document from base64 data

If you have the file data as a base64 string, the best way to load the document in PDF.js Express is to first convert it to a Blob and then load it as described for Blobs. Below are some example code showing how to convert base64 to a Blob.

function base64ToBlob(base64) {
  const binaryString = window.atob(base64);
  const len = binaryString.length;
  const bytes = new Uint8Array(len);
  for (let i = 0; i < len; ++i) {
    bytes[i] = binaryString.charCodeAt(i);
  }

  return new Blob([bytes], { type: 'application/pdf' });
};

WebViewer(...)
  .then(instance => {
    instance.loadDocument(base64ToBlob(myBase64String), { filename: 'myfile.pdf' });

    const { docViewer } = instance;
    docViewer.on('documentLoaded', () => {
      // perform document operations
    });
  });