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

# Global methods

> Global methods for encoding and decoding Base64 strings.

Global JavaScript methods available to Custom activity scripts for Base64 encoding and decoding.

## Methods

### btoa

```javascript theme={null}
string btoa(string input);
```

Encodes a string as Base64.

### atob

```javascript theme={null}
string atob(string base64Input);
```

Decodes a Base64 string back to its original form.

## Related topics

* [BinaryFile](/vantage/documentation/skill-designer/process/custom-activity/binary-file)
* [HttpRequest](/vantage/documentation/skill-designer/process/custom-activity/http-request)
* [Object model](/vantage/documentation/skill-designer/process/custom-activity/object-model)