> ## 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: Base64EncodeToString

> Encode a byte array into a Base64 string using the standard encoding scheme. Use for preparing binary data for API calls in ETL pipelines.

## Description

Encodes a byte array argument into a string using Base64 encoding scheme.

## Syntax

`Base64EncodeToString(bytearray_expression[, chunked])`

## Arguments

*bytearray\_expression* - an expression that represents a bytearray value to be encoded

*chunked (optional)* - if true, the output will be chunked into 76 characters blocks (boolean, default false).

## Examples

`Base64EncodeToString(GetBytes('hello world'))` returns 'aGVsbG8gd29ybGQ='.

`Base64EncodeToString(GetBytes('username:password'))` returns 'dXNlcm5hbWU6cGFzc3dvcmQ='.

## Return value datatype

String

## Impact of null value

If input is null, returns null.