Section:

Open a document from Base64

Opening a document in WebViewer from base64 data

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

1function base64ToBlob(base64) {
2  const binaryString = window.atob(base64);
3  const len = binaryString.length;
4  const bytes = new Uint8Array(len);
5  for (let i = 0; i < len; ++i) {
6    bytes[i] = binaryString.charCodeAt(i);
7  }
8
9  return new Blob([bytes], { type: 'application/pdf' });
10};
11
12WebViewer(...)
13  .then(instance => {
14    // `myBase64String` is your base64 data which can come
15    // from sources such as a server or the filesystem
16    instance.UI.loadDocument(base64ToBlob(myBase64String), { filename: 'myfile.pdf' });
17
18    const { documentViewer } = instance.Core;
19    documentViewer.addEventListener('documentLoaded', () => {
20      // perform document operations
21    });
22  });

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