# DMG

The DMG target builds Apple Disk Image (`.dmg`) files, which are the standard format for sharing macOS apps. The DMG acts like a ZIP file, but provides an easy way for users to take the app and put it in the `/Applications` directory.

{% hint style="success" %}
**Static file auto-updates with DMG distributions**

The [Squirrel.Mac](https://github.com/Squirrel/Squirrel.mac) implementation behind Electron's `autoUpdater` module on macOS supports static file auto-updates from the ZIP artifacts uploaded to your cloud storage [Publishers](/config/publishers.md).

If you want to distribute a DMG that supports static file auto-updates, make sure to also make a [ZIP](/config/makers/zip.md) target and follow the [S3](/config/publishers/s3.md#auto-updating-from-s3) instructions to configure updates.
{% endhint %}

## Requirements

You can only build the DMG target on macOS machines.

## Installation

```sh
npm install --save-dev @electron-forge/maker-dmg
```

## Usage

To use `@electron-forge/maker-dmg`, add it to the `makers` array in your [Forge configuration](/config/configuration.md):

{% code title="forge.config.js" %}

```javascript
module.exports = {
  makers: [
    {
      name: '@electron-forge/maker-dmg',
      config: {
        background: './assets/dmg-background.png',
        format: 'ULFO'
      }
    }
  ]
};
```

{% endcode %}

Configuration options are documented in [`MakerDMGConfig`](https://js.electronforge.io/classes/_electron_forge_maker_dmg.MakerDMG.html).

## Debugging

For advanced debug logging for this maker, add the `DEBUG=electron-installer-dmg*` environment variable.


---

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