> ## Documentation Index
> Fetch the complete documentation index at: https://www.integrate.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# ETL: Base64Decode

> Decode a Base64-encoded string into a byte array in your ETL pipeline. Use BASE64DECODE for processing encoded binary data in transformations.

## Description

Decodes a Base64 string into a bytearray.

## Syntax

`Base64Decode(string_expression)`

## Examples

`Base64Decode('aGVsbG8gd29ybGQ=')` returns a byte array equivalent to 'hello world'

## Return value datatype

Bytearray

## Notes

If the input expression is not a valid Base64 string, it will be ignored and an empty string will be returned.

## Impact of null value

If input is null, returns null.