# File to Base64

> Convert a file into a Base64-encoded string using a native activity in the Studio Web API workflow designer.

The **File to Base64** activity converts a file into a Base64-encoded string directly in the API workflow designer, without writing custom JavaScript code.

Use it when a downstream step expects a file as an inline Base64 string, for example when sending an image or audio file to an AI model or API that accepts Base64-encoded payloads.

## Using the File to Base64 activity

To add a **File to Base64** activity to your workflow:

1. On your API workflow designer canvas, select the plus (+) icon. The **Add activity** menu appears.
2. Select **More ...**, then **File to Base64**.
3. In the **Properties** panel, configure the input file and the variable that stores the resulting Base64 string.
4. Debug the workflow to execute the activity and generate output fields for later use.