How to Configure Installer Window Size in DMGKit

DMGKit lets you fully control the installer window size of your macOS DMG, while preserving exact layout positioning from the Designer.

Choosing the correct resolution ensures your installer looks clean, professional, and consistent across all Mac devices.

If you haven’t created your layout yet, read: Custom Installer Design Guide.

Why Installer Resolution Matters on macOS

Not all Macs display installers the same way.

Differences in:

  • screen size;
  • Retina scaling;
  • Finder behavior;

can affect how your installer appears to users.

Choosing the right DMG window size helps you:

  • Deliver a polished, professional installer experience;
  • Prevent UI clipping on smaller screens;
  • Maintain consistent layout positioning.

Available Installer Resolution Presets

DMGKit provides carefully selected presets optimized for macOS:

  • Compact (960 × 600) – safest for small displays;
  • Small (1120 × 700) – compact and efficient;
  • Balanced (1280 × 800) – recommended;
  • Large (1440 × 900) – more spacious layout;
  • Default (1600 × 1000) – original design canvas.

Each option scales your layout proportionally, so your design remains intact.

How to Change Installer Window Size in DMGKit

Follow these steps:

  1. Open Settings;
  2. Navigate to Installer Resolution;
  3. Click the resolution selector;
  4. Choose your preferred size.

Your selection is saved automatically and applied to all exported DMGs.

How DMGKit Scaling Works

DMGKit uses a base design canvas of 1600 × 1000.

When exporting:

  • Layout is scaled proportionally;
  • Icon positions remain precise;
  • Spacing and alignment are preserved.

This ensures your installer looks exactly as designed, regardless of resolution.

Retina Display Behavior (Important)

Modern Macs use Retina displays, which can affect how installers render.

DMGKit automatically handles this by:

  • Exporting background images at 2× resolution;
  • Keeping Finder window size at the correct logical dimensions.

Result:

  • Consistent appearance across devices;
  • Crisp, sharp visuals;
  • No oversized or misaligned UI.

Recommended Installer Resolution

Balanced (1280×800).

This is the best overall choice because it offers:

  • Strong compatibility across MacBook sizes;
  • Comfortable readability;
  • Clean visual proportions.

Best Practices for Installer Window Size

  • Test your installer on smaller screens (e.g. MacBook Air);
  • Avoid using maximum size unless necessary;
  • Keep key elements centered and spaced properly.

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