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title: fromBase64
collection: mulesoft
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content_type: documentation
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---
---
product: DataWeave
version: 2.3
---

# fromBase64

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

## fromBase64(String): Binary

Transforms a Base64 string into a binary value.

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>base64String</code></p></td><td><p>The Base64 string to transform.</p></td></tr></tbody></table>

### Example

This example takes a Base64 encoded string and transforms it into a binary value. This example
assumes that the `payload` contains the Base64 string generated from an image in example
[toBase64](https://docs.mulesoft.com/dataweave/2.3/dw-binaries-functions-tobase64#toBase64-example).

#### Source

```DataWeave
%dw 2.0

import fromBase64 from dw::core::Binaries
output application/octet-stream
---
fromBase64(payload)
```

#### Output

The output of this function is a binary value that represents the image generated in example
[toBase64](https://docs.mulesoft.com/dataweave/2.3/dw-binaries-functions-tobase64#toBase64-example).