CONVERT DMG → TAR (DMG to TAR)
Fast, secure DMG to TAR conversion. No registration required.
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HOW TO CONVERT DMG → TAR
Upload the DMG
Send the archive file to KaijuConverter. Entries are never written to disk in cleartext.
Repack through 7-Zip
Our pipeline opens the DMG in streaming mode, walks every entry and writes it into a fresh TAR container.
Download the TAR
The new archive is ready in seconds. Both files auto-delete within two hours.
Situation. DMG is Apple's Disk iMaGe format for packaging macOS applications and data. Solution: a TAR, produced below. Repacking a DMG as a TAR is usually about compatibility (Windows prefers TAR handling while macOS ships better DMG support) or about size (modern TAR formats often beat older DMG by 10-30% with LZMA / Zstd codecs). Either way the transformation is reversible and lossless. A quick refresher — DMG is Apple's Disk iMaGe format for packaging macOS applications and data. By contrast, TAR is the Unix tape archive — a concatenation of files without compression.
Why convert DMG to TAR
TAR is supported by more systems out of the box than DMG. Windows reads TAR without extra software; macOS and most Linux distros ship decoders too. Converting upstream saves every downstream user from installing a utility just to read your bundle.
DMG vs TAR — Technical specifications
Side-by-side comparison of the technical details.
DMG
- 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
- MIME Type
- application/x-apple-diskimage
- Category
- Archives & Compressed
- Full Name
- Apple Disk Image
- Conversion Engine
- ARCHIVE
TAR
- MIME type
- application/x-tar
- Extension
- .tar
- MIME Type
- application/x-tar
- Category
- Archives & Compressed
- Full Name
- TAR Archive
- Conversion Engine
- ARCHIVE
- Block size
- 512 bytes (traditional)
- Header variants
- v7, ustar, POSIX.1-2001 (pax), GNU
- Max filename length
- 100 bytes (v7); unlimited (pax extended headers)
| Specification | DMG | TAR |
|---|---|---|
| MIME type | application/x-apple-diskimage | application/x-tar |
| Extension | .dmg | .tar |
| Container types | UDIF (Universal Disk Image Format) | — |
| Compression | UDCO (zlib), UDBZ (bzip2), UDZO (LZMA), ULMO (LZMA) | — |
| Encryption | AES-128 or AES-256 | — |
| MIME Type | application/x-apple-diskimage | application/x-tar |
| Category | Archives & Compressed | Archives & Compressed |
| Full Name | Apple Disk Image | TAR Archive |
| Conversion Engine | ARCHIVE | ARCHIVE |
| Block size | — | 512 bytes (traditional) |
| Header variants | — | v7, ustar, POSIX.1-2001 (pax), GNU |
| Max filename length | — | 100 bytes (v7); unlimited (pax extended headers) |
DMG vs TAR — Strengths and limitations
What each format does best, and where it falls short.
DMG Strengths
- 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).
Limitations
- 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.
TAR Strengths
- Streamable — you can tar files straight to a network pipe, no seek needed.
- Preserves Unix permissions, ownership, symbolic links, and timestamps.
- Universally supported on Unix-like systems.
- Simple format — the GNU tar source has been stable for decades.
- No compression overhead — pair with gzip/xz/zstd as needed.
Limitations
- No built-in compression — plain .tar files are the same size as their contents.
- No random access — reading one file requires scanning from the start.
- Windows tooling is second-class — PowerShell only added native tar in 2018.
Quality & Compatibility
Archive conversion is strictly lossless. Byte-for-byte the files inside the TAR are the same as those that were inside the DMG; hashes of individual entries match pre- and post-conversion. Only the container wrapper changes.
Tips for Best Results
- For maximum compression, pick the slowest level in Advanced — the decoder speed of TAR is unaffected by how hard we crunch on our side.
- Keep a DMG backup until you have verified the TAR opens correctly in the destination tool; archives occasionally expose codec bugs at the edge.
- Do not convert already-compressed payloads (video, music, images) expecting smaller output — archive converters cannot compress what is already at the entropy limit.
Frequently Asked Questions
Yes. The free tier accepts files up to 25 MB without registration, email capture or watermarks; paid plans go up to 2 GB. Paid plans raise the size cap, enable batch conversions and provide a REST API for automation, but nothing on the free tier is quality-limited — the output is exactly the same as on any paid plan.
Yes — because DMG and TAR use different compression codecs, every entry is decompressed from the DMG and re-compressed for the TAR. The uncompressed data is identical on both sides, and the re-compression happens entirely inside our processing container.
Uploads run over HTTPS, files are processed in isolated containers, and both the source DMG and the TAR output are auto-deleted within two hours. No account is required, file contents are never logged, and KaijuConverter does not use uploads for AI training. The paid plan adds a signable data-processing agreement for regulated workflows.
Usually yes, modestly, when the original DMG used an older codec like Deflate. Against modern LZMA2 / Zstd TAR containers expect 10-30% savings on mixed content and almost no change on pre-compressed payloads. Advanced → compression level lets you trade speed for ratio.
Most files finish in well under a minute. Small images and documents are typically ready in a few seconds; large video or audio files scale roughly with duration. Upload speed from your network is usually the dominant factor, not server time.
Yes. Provide the password during upload; we use it only to decrypt inside the processing container and never log or persist it. The resulting TAR can be re-encrypted with a password of your choice (AES where the target format supports it).
Apple Disk Image
Source formatDMG (Apple Disk Image) is the standard disk image format on macOS for distributing software. It can contain a complete file system with compression and optional encryption, and supports internet-enabled auto-mounting for seamless app installation.
TAR Archive
Target formatTAR is a Unix archive format that bundles files together without compression. It is commonly combined with gzip or bzip2 for compressed archives and is the standard for Linux software distribution.
Common Use Cases
Share across platforms
Send TAR files to anyone without worrying about whether they have the right software for DMG.
Embed in documents
Drop TAR output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
TAR often produces smaller files than DMG for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
DMG vs TAR — Typical file sizes
Approximate file sizes for common scenarios.
- Small macOS app 5-30 MB
- Xcode installer ~12 GB
- macOS installer (full) 12-15 GB
- 1 MB of source files (uncompressed .tar) ~1 MB
- Same files as .tar.gz 150-400 KB
- Linux kernel source (.tar.xz) ~120 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.