CONVERT
DMG → 7Z
Fast, secure DMG to 7Z conversion. No registration required.
DRAG. DROP. DONE.
Upload any file and our engines will handle format detection automatically.
Max 100 MB · Free plan · No signup required
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Situation. DMG is Apple's Disk iMaGe format for packaging macOS applications and data. Solution: a 7Z, produced below. DMG to 7Z conversion is the fastest path when the platform or tool you are shipping to does not speak DMG. Instead of asking every recipient to install a decoder, produce a 7Z once and hand them something their OS opens natively. Context: DMG is Apple's Disk iMaGe format for packaging macOS applications and data. 7Z is the 7-Zip archive format, offering higher compression ratios than ZIP via LZMA.
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.
7-Zip Archive
Target format7z uses the LZMA2 compression algorithm to achieve significantly better compression ratios than ZIP. It is open-source and supports strong AES-256 encryption.
Why convert DMG to 7Z
A 7Z often compresses the same content smaller than a DMG at the same strength setting, thanks to more modern codecs. For distribution over bandwidth-limited channels — email, chat apps, CDN delivery — the size difference matters.
HOW TO CONVERT
DMG → 7Z
Provide the DMG
Drag-and-drop the archive or pick it from your computer. We accept up to 100 MB on the free tier.
Stream-convert
The DMG is decompressed and re-compressed into 7Z in a single pipeline stage — no temporary extracted folder.
Retrieve the output
Click to download the 7Z. File structure, timestamps and permissions match the original exactly.
Common Use Cases
Legacy format rescue
Re-archive decades-old DMG collections into 7Z before the DMG tooling disappears from modern package managers.
Cloud storage optimisation
7Z tends to compress better than DMG on text-heavy payloads — fewer bytes stored means lower monthly costs.
CI/CD artefact pipelines
Build agents publish artefacts as 7Z when downstream jobs consume 7Z natively; avoid an extra extract-and-rezip step.
Mobile sharing
Phone archive apps handle 7Z out of the box but may prompt the user to install extra software for DMG.
Quality & Compatibility
Compressed size can go up or down between DMG and 7Z depending on the codec and the level — modern LZMA2/Zstd usually beats older Deflate on text, while already-compressed content (images, video) changes little. We default to a balanced level; Advanced options expose the full range.
Tips for Best Results
- If the DMG is password-protected, we will ask for the password during upload; the resulting 7Z is emitted with encryption too if the format supports it.
- When the 7Z has to fit a strict upload cap, split into multi-volume archives in Advanced — several smaller 7Z parts are often accepted where a single large one is rejected.
- For distribution bundles, include a short README at the root of the 7Z so recipients know what the archive contains without extracting it.
Frequently Asked Questions
Frequently Asked Questions
Yes. The free tier accepts files up to 100 MB without registration, email capture or watermarks. 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 7Z use different compression codecs, every entry is decompressed from the DMG and re-compressed for the 7Z. 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 7Z 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 7Z 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 7Z can be re-encrypted with a password of your choice (AES where the target format supports it).
Related Guides
7z and 7-Zip: Maximum Compression Format Explained
Complete guide to the 7z format and 7-Zip software. Comparison with ZIP and RAR, LZMA2 algorithm, creating and extracting archives, AES-256 encryption, and automation.
Read guideArchive Formats Compared: ZIP, 7Z, RAR, TAR, and ZSTD
Complete comparison of ZIP, 7-Zip, RAR, TAR.GZ, TAR.XZ, and Zstandard archive formats. Compression ratio, speed, encryption, and when to use each format.
Read guideRAR vs ZIP vs 7Z: Which Compression Format Should You Use?
Compare RAR, ZIP, and 7Z compression: file size, speed, compatibility, and when to use each. Includes practical examples and tool recommendations.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 2 hours. We never read, share, or store your data.