CONVERT DMG → BZ2 (DMG to BZ2)
Fast, secure DMG to BZ2 conversion. No registration required.
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HOW TO CONVERT DMG → BZ2
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 BZ2 container.
Download the BZ2
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 BZ2, produced below. Repacking a DMG as a BZ2 is usually about compatibility (Windows prefers BZ2 handling while macOS ships better DMG support) or about size (modern BZ2 formats often beat older DMG by 10-30% with LZMA / Zstd codecs). Either way the transformation is reversible and lossless. Background. DMG is Apple's Disk iMaGe format for packaging macOS applications and data. Destination side, BZ2 is the bzip2 Burrows-Wheeler compression format, slower but tighter than gzip.
Why convert DMG to BZ2
BZ2 is supported by more systems out of the box than DMG. Windows reads BZ2 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 BZ2 — 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
BZ2
- MIME type
- application/x-bzip2
- Extension
- .bz2
- MIME Type
- application/x-bzip2
- Category
- Archives & Compressed
- Full Name
- Bzip2 Compressed
- Conversion Engine
- ARCHIVE
- Extensions
- .bz2, .tbz2, .tb2
- Algorithm
- Burrows-Wheeler Transform + Huffman coding
- Block size
- 100-900 KB (configurable)
- Max block size
- 900 KB
| Specification | DMG | BZ2 |
|---|---|---|
| MIME type | application/x-apple-diskimage | application/x-bzip2 |
| Extension | .dmg | .bz2 |
| 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-bzip2 |
| Category | Archives & Compressed | Archives & Compressed |
| Full Name | Apple Disk Image | Bzip2 Compressed |
| Conversion Engine | ARCHIVE | ARCHIVE |
| Extensions | — | .bz2, .tbz2, .tb2 |
| Algorithm | — | Burrows-Wheeler Transform + Huffman coding |
| Block size | — | 100-900 KB (configurable) |
| Max block size | — | 900 KB |
DMG vs BZ2 — 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.
BZ2 Strengths
- 10-15% smaller than gzip for the same content.
- Block-based — partial recovery possible from corrupted archives.
- Patent-free, open-source reference implementation.
- Stable for 30+ years with no breaking changes.
Limitations
- Much slower than gzip — 3-5× the compression time.
- Still slower than xz and zstandard at modern levels.
- Single-threaded in reference; pbzip2 fixes this.
Quality & Compatibility
Archive conversion is strictly lossless. Byte-for-byte the files inside the BZ2 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 BZ2 is unaffected by how hard we crunch on our side.
- Keep a DMG backup until you have verified the BZ2 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 BZ2 use different compression codecs, every entry is decompressed from the DMG and re-compressed for the BZ2. 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 BZ2 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 BZ2 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 BZ2 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.
Bzip2 Compressed
Target formatBzip2 provides higher compression ratios than gzip at the cost of slower speed. It is commonly used for .tar.bz2 archives in Linux distributions where smaller download sizes are preferred.
Common Use Cases
Share across platforms
Send BZ2 files to anyone without worrying about whether they have the right software for DMG.
Embed in documents
Drop BZ2 output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
BZ2 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 BZ2 — 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
- Text file 20-30% of original
- Source code archive 15-25% of original
- Linux kernel source (.tar.bz2) ~150 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.