---
url: /process-functions/workbook-convertfrombase64.md
description: Decodes a base64 workbook into an Apache POI workbook.
---

# workbook.convertFromBase64 

::: warning Deprecated
Use [`workbook.fromBase64`](/process-functions/excel-workbook#workbook-frombase64) instead.
:::

Decodes base64 data into an Apache POI workbook.

```js
workbook.convertFromBase64(base64str, password)
```

## Parameters

| Parameter | Type | Description |
|---|---|---|
| `base64str` | `string` | The workbook, base64-encoded. |
| `password` | `string` | Optional. The workbook's password.  |

## Returns

An Apache POI workbook.

## Examples

```js
const wb = workbook.convertFromBase64(base64Data);
```