> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/web/open-save-document/open/base64.md).

# Open a document from Base64

Efficiently open a base64 string document in WebViewer. The Apryse Web SDK streamlines secure, serverless document processing with robust support for JavaScript and TypeScript, and seamlessly integrat

## 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](/web/open-save-document/open.md). Below is some example code showing how to convert base64 to a Blob.

{% tabs %}
{% tab title="JavaScript (SDK v8.0+)" %}
{% code lineNumbers="true" %}

```js
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 => {
    // `myBase64String` is your base64 data which can come
    // from sources such as a server or the filesystem
    instance.UI.loadDocument(base64ToBlob(myBase64String), { filename: 'myfile.pdf' });

    const { documentViewer } = instance.Core;
    documentViewer.addEventListener('documentLoaded', () => {
      // perform document operations
    });
  });
```

{% endcode %}

[UI.loadDocument](https://sdk.apryse.com/api/web/UI.html#loadDocument__anchor)
{% endtab %}

{% tab title="JavaScript (SDK v6.0+)" %}
{% code lineNumbers="true" %}

```js
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 => {
    // `myBase64String` is your base64 data which can come
    // from sources such as a server or the filesystem
    instance.loadDocument(base64ToBlob(myBase64String), { filename: 'myfile.pdf' });

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

{% endcode %}

[WebViewerInstance.loadDocument](https://sdk.apryse.com/api/web/UI.html#loadDocument__anchor)
{% endtab %}
{% endtabs %}

## Loading Options

WebViewer provides various options to load a document. Whether you are loading a document through the `initialDoc` option in the constructor or calling `loadDocument` after mounting, you can always provide [options to load your document](/web/open-save-document/open.md#loading-options).


---

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