DMG to 7Z Converter
Convert DMG to 7Z online for free. Fast, secure, and high-quality conversion with no sign-up or software required.
Maximum file size is 1GB
How it works
Three steps to your converted file
Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.
Upload your file
Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.
Choose an output format
Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.
Convert & download
Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.
What is a DMG file?
The DMG (Apple Disk Image) format is a proprietary disk image container developed by Apple Inc., functioning as a virtual volume that encapsulates file systems including HFS+ (Mac OS Extended) and APFS (Apple File System). Built on the Universal Disk Image Format (UDIF) specification, DMG archives support block-level compression algorithms such as zlib, bzip2, ADC (Apple Data Compression), and LZFSE, alongside optional 128-bit or 256-bit AES encryption. The file structure concludes with a trailer containing an XML property list (plist) and a Resource Fork, which define the partition map and include CRC-32 checksums for data integrity verification during the mounting process.
How to open a DMG file
On macOS, DMG files are handled natively by the Apple DiskImageMounter utility, which mounts the image as a virtual drive within Finder without requiring external software. Windows operating systems lack the kernel-level drivers to read HFS+ or APFS file systems; therefore, users must rely on third-party extraction utilities such as 7-Zip, PeaZip, or TransMac to access the contained data. In Linux environments, users typically employ the command-line tool dmg2img to convert the archive into a standard ISO format before mounting, or use p7zip for direct extraction.
DMG Technical Info
- Full Name
- Apple Disk Image
- Developed By
- Apple Inc.
- Initial Release
- 2001
- MIME Type
- application/x-apple-diskimage
What is a 7z file?
The 7z format is a compressed archive container created by Igor Pavlov in 1999, characterized by an open architecture and high compression ratios utilizing the LZMA and LZMA2 algorithms. It supports file sizes up to 16 exbibytes (2^64 bytes), Unicode file names, and strong AES-256 encryption, with solid compression capabilities to enhance efficiency for similar file sets. Distributed under the GNU LGPL, the format's modular design accommodates various pre-processing filters and encryption methods, establishing it as a primary standard for high-efficiency data archival.
How to open a 7z file
While Windows 11 builds utilizing the libarchive project offer native support, earlier Windows versions require the official open-source 7-Zip utility or alternatives like WinRAR and PeaZip for extraction. macOS users typically rely on third-party software such as The Unarchiver or Keka, whereas Linux distributions handle 7z archives via the p7zip package accessed through the command line or GUI managers like File Roller.
7z Technical Info
- Full Name
- 7z Archive Format
- Developed By
- Igor Pavlov
- Initial Release
- 1999
- MIME Type
- application/x-7z-compressed
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Purpose-built for speed, privacy, and breadth of format support.
Convert DMG to 7Z in seconds
Every DMG to 7Z conversion runs on our servers, so your device stays fast and the output quality stays intact.
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No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.
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Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.
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Developer API
Convert DMG to 7Z via API
Automate DMG to 7Z conversions in three steps: create a job, upload your file, then poll for the result.
# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"tag": "dmg-to-7z",
"tasks": {
"upload-file": {
"operation": "import/upload"
},
"convert": {
"operation": "convert",
"input": "upload-file",
"output_format": "7z"
},
"export-result": {
"operation": "export/url",
"input": "convert"
}
}
}'
# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.dmg
# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
-H "Authorization: Bearer YOUR_API_KEY"Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.