Sobre os arquivos DMG
Apple Disk Image
Formato de imagem de disco virtual macOS — padrão para distribuição de software para Mac. Pode ser comprimido, criptografado e auto-montável. Equivalente Apple ao MSI/EXE/ISO.
Família
Archives & Compressed
Extensão
.dmg
Tipo MIME
application/x-apple-diskimage
Pode ser usado como
COMO NASCEU O
FORMATO DMG.
DMG — Apple Disk iMaGe — replaced the older .img and .sit formats when Apple shipped Mac OS X Server 1.0 in 1999. A .dmg is a read-only, usually compressed disk image that mounts on macOS as if it were a real volume: the user drags the app icon from the mounted volume to the Applications folder and that's the install.
DMGs can be plain disk images, zlib-compressed (UDCO), bzip2-compressed (UDBZ), or LZMA-compressed (UDZO/ULMO). Modern DMGs from Apple’s App Store are ZFS-like compressed variants. Every third-party macOS app distributed outside the App Store ships as a DMG with a custom background, volume icon, and an arrangement arrow telling the user to drag the app into Applications. It’s a signature macOS aesthetic.
CURIOSIDADES E
FATOS INTERESSANTES.
The custom DMG background with a pointing arrow telling you "drag the app to Applications" is a macOS cultural signature — invented by no one officially, copied by every indie Mac app.
DMG files can be password-protected via AES-128 or AES-256 encryption — the Finder prompts for the password when mounting.
Apple ships all its non-App Store downloads as DMGs: Xcode, Safari beta, macOS installers, Pages/Keynote.
A DMG can contain multiple partitions, EFI boot sectors, and be bootable — Recovery DMGs use this.
The container format is proprietary but documented enough that tools like dmg2img on Linux can extract most DMGs.
VANTAGENS E
LIMITAÇÕES.
Vantagens
- Universal macOS distribution format since 1999.
- Compressed or encrypted variants available.
- Can be bootable (used by recovery and installer DMGs).
- Custom backgrounds and layout create polished installer experience.
- Preserves Mac-specific filesystem metadata (extended attributes, resource forks).
Limitações
- macOS-only — Windows and Linux need third-party tools.
- Proprietary container with limited public documentation.
- File sizes are often larger than equivalent ZIP or 7z.
- Opaque to most antivirus and malware-scanning pipelines.
Tamanhos típicos de arquivo
Small macOS app
5-30 MB
Xcode installer
~12 GB
macOS installer (full)
12-15 GB
Especificações técnicas
- MIME type
- application/x-apple-diskimage
- Extension
- .dmg
- Container types
- UDIF (Universal Disk Image Format)
- Compression
- UDCO (zlib), UDBZ (bzip2), UDZO (LZMA), ULMO (LZMA)
- Encryption
- AES-128 or AES-256
CONVERTER A PARTIR DE
DMG
Casos de uso comuns
macOS software distribution, application installers, encrypted disk images
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Perguntas frequentes sobre DMG
Perguntas frequentes
DMG (Apple Disk Image) is an archive formato used to bundle multiple arquivos e folders em a single comprimido file. The archive preserves the directory structure e tipicamente reduces total size via compressão. DMG sits no archives & comprimido family e has specific strengths around compressão ratio, speed, ou plataforma support.
7-Zip, WinRAR, The Unarchiver (macOS), e the built-in archive utilities no Windows e macOS abrir most DMG files. para command-line extraction, 7z, unar, ou the formato-specific tool handles DMG cleanly. If your extractor does not recognise DMG, converter to ZIP first — ZIP opens on every operating system sem extra software.
Upload the DMG to KaijuConverter e pick ZIP, 7Z, TAR.GZ, ou RAR como o target. Our pipeline extracts the original archive e re-compresses the contents em the target formato. arquivo permissions, timestamps, e directory structure are preserved where both formatoos support them.
Depends no goal. ZIP is the universal baseline — every OS extracts it out of the box. formatoos like 7Z ou TAR.GZ compress better mas require specific ferramentas. DMG may win on compressão ratio, password support, ou OS integration para specific workflows; ZIP wins on raw compatibilidade.