The DMG installer editor pros actually want.
Design your DMG window on a faithful WYSIWYG canvas, drop in your background and license agreement, then sign and notarize through Apple — all in one app, in under three minutes, without ever opening Terminal.
Everything the ship pipeline needs.
WYSIWYG canvas
Drag-and-drop layout editor with smart alignment guides, marquee select, multi-item align and distribute, and four built-in starter templates (Classic, Compact, Pro Tool, Documentation).
Custom volume icons
Drop any image — PNG, JPG, HEIC — and Juju auto-converts to multi-resolution .icns via the macOS sips + iconutil pipeline. Cancellable mid-conversion if you change your mind.
Backgrounds gallery
Capped MRU library of background images, content-deduplicated by SHA-256. Drop-to-import, click-to-apply, no manual file management.
EULA editor + starter templates
Built-in license agreement editor with a UK / EU / US starter template generator. AS-IS / damages-capped wording you can edit before insertion. Embeds in the .jujudmg file so it travels with shared layouts.
Pre-flight .app validation
Validates Hardened Runtime, Developer ID signing, and codesign --verify --deep --strict before the two-minute notarization round-trip. Catches the common rejection reasons locally in under a second.
Auto-fetch notary log
When Apple's notary service returns "Invalid", Juju runs
xcrun notarytool log for you and appends the JSON
response to the failure card. No more manual Terminal trips to
find out why Apple rejected.
Layouts library
Save your favourite canvas configurations to a personal library, distinct from the built-in templates. Apply, rename, delete via context menu. Per-machine, persistent across launches.
Autosave
Silent 5-minute autosave for layouts that have been saved at least once. No nag dialogs, no overwrites without changes — just quiet protection against the unsaved-half-hour-of-work moment.
Test in Finder
⌘⇧T builds an unsigned DMG and mounts it in Finder for instant preview. Auto-hides Tahoe's tab bar after mount. Five seconds from edit to verification.
From canvas to App Store-grade installer.
- 01
Drop your .app
The placeholder switches to your app's real icon. Inspector populates with its details.
- 02
Drop a background
Any image, any format. Routed to the backdrop automatically; added to the gallery for reuse.
- 03
Configure signing & notarization
Pick your Developer ID Application identity, name your notarytool keychain profile. One-time setup.
- 04
Build DMG
Stages, compresses, signs, submits to Apple, staples — typically 3-5 minutes end to end. Cancel any time.
- 05
Ship
SHA-256 hash, signed + notarized status, reveal-in-Finder button. Ready to upload.
Try it free for 7 days.
Full functionality, no feature gates, no credit card required. Drop your .app, design your DMG, ship a signed installer this afternoon.
~12 MB · macOS 26+ · Apple Silicon · Developer ID Notarized