Version 3.6 of DropDMG is now available.

DropDMG makes it easy to create a professional disk image for your app. Disk images pack entire folders or disks into a single compressed file, either for transport across the Internet or simply for backup or archival. They are Apple’s preferred format for distributing Mac software and the only archive format whose contents you can directly access in the Mac Finder—no extraction or third-party software required.

Deliver your Mac app on a .dmg file with a software license agreement, a custom volume icon, and a precise icon layout atop a Retina-optimized background picture. Customers can install simply by dragging and dropping the app onto the convenient Applications folder link. Code-sign your .dmg so that macOS knows it can be trusted after download.

This is a free update for owners of DropDMG 3.0 that includes the following enhancements:

• Updated the user interface for macOS 11 Big Sur:
  • Redesigned the application icon.
  • The main window uses the new inline title bar style, the toolbar defaults to icon-only mode and supports the new large icon style, and the toolbar icons have been updated.
  • The Preferences window uses the new, centered toolbar style and has updated icons.
  • Table views in the Preferences window have been updated.
  • The user interface now reflects the fact that macOS 11 removes support for creating NDIF disk images.
  • The Layouts section of the manual has updated guidance on background picture dimensions that takes into account the window layout changes in macOS 11.
  • Updated the Custom volume icon feature for Big Sur.
  • Worked around a macOS bug that prevented progress bars from being drawn.
  • Worked around an animation glitch.
• Added support for LZMA-compressed disk images on macOS 10.15 and later. This format is even more tightly compressed than bzip2, with slightly slower compression speed and much faster decompression.
• When using the dropdmg command-line tool, you can now specify additional parameters in combination with --config-name to override the values in the configuration. (This also works with the corresponding AppleScript command and parameters.)
• Configurations now show a Gatekeeper badge on the icon when the disk image is code-signed.
• Various operations that used to require multiple passphrase prompts when dealing with an encrypted disk image now require only one.
• DropDMG no longer lets you try to codesign encrypted disk images, as macOS does not support that.
• DropDMG now requires macOS 10.9 or later.
• When encountering various kinds of file permissions errors, DropDMG will now recommend that you grant it Full Disk Access.
• Added more fine-grained control over DropDMG’s layout checks, so that it can still ensure that icon sizes and positions are correct even if you’ve told it to ignore a Finder error that causes the window size to be slightly off.
• DropDMG no longer considers it to be an error if an icon position is off by only a fraction of a point, which can happen with certain combinations of file types and Finder view settings.
• Worked around a bug in macOS 10.15 that could cause a spurious “Permission denied” error when using the Change Image Passphrase…, Convert Image/Archive…, or Verify Image… command.
• Removed support for Growl, as all supported macOS versions now have Notification Center.

DropDMG 3.6 works with macOS 10.9 through 11.0. Older DropDMG versions are available for older versions of macOS. In-depth information about DropDMG is available in the manual.

If you enjoy using DropDMG, please take a moment to review it on the Mac App Store, Product Hunt, or MacUpdate or to mention it on Twitter, Facebook, or your own site. We’d really appreciate it.

DropDMG 3.6 will be submitted to the Mac App Store when macOS 11 Big Sur is released.

Update (2020-11-10): DropDMG 3.6 is now available from the Mac App Store.