What is PKG?

PKG (application/x-pkg) uses lossy compression optimized for macos software installation, package extraction, application repackaging. macOS Installer Package, Apple Flat-Package software distribution archive

What is CAB?

Cabinet (CAB) is Microsoft's native compression archive format, used primarily for Windows software installation packages.

When Should You Use PKG vs CAB?

PKG vs CAB: Key Differences

• •PKG uses lossy compression while CAB uses lossy compression — both take the same approach to file size management.
• •Both formats share lossy compression, so quality behavior is similar across the two — file size differences come from algorithm efficiency rather than compression philosophy.
• •How transparency is handled: CAB does not support alpha channels — transparent areas in the source will become opaque.
• •File sizes: PKG files typically range N/A and CAB files Comparable to ZIP.
• •Use case fit: PKG targets macos software installation, package extraction, application repackaging and CAB targets windows software installation, drivers — your choice depends on which workflow stage you are serving.

Advantages of PKG

• ✓PKG uses lossy compression tailored for macOS software installation, package extraction, application repackaging.
• ✓PKG is supported natively on virtually every device, browser, and operating system.
• ✓PKG files are compact and quick to transfer, even over slow connections.
• ✓PKG integrates seamlessly with all major creative tools and workflows.

Advantages of CAB

• ✓CAB compresses data using lossy methods, keeping file sizes manageable for Windows software installation, drivers.
• ✓Industry-wide support means CAB files open anywhere — from legacy systems to the latest devices.
• ✓Small file sizes make CAB ideal for email, web uploads, and cloud storage.
• ✓From professional software to open-source alternatives, CAB works out of the box.

Common Use Cases for PKG to CAB Conversion

• Multimedia asset packaging
• Encrypted data transport
• Snapshot versioning
• File compression and sharing
• Software distribution
• System backups

Industry Applications

Best Practices for PKG to CAB Conversion

• →For PKG to CAB conversion: CAB provides broad compatibility across operating systems
• →Verify archive integrity after creation by testing extraction
• →Consider splitting large archives into smaller volumes for easier transfer
• →Always keep a backup of your original files before converting
• →Choose the appropriate quality settings for your specific use case

Troubleshooting PKG to CAB Conversion

• !The converted CAB archive is smaller than expected → some files may have been skipped; verify the file count matches the source
• !File permissions lost in the converted CAB → not all archive formats preserve Unix permissions and ownership metadata
• !The CAB archive extracts to a different folder structure → verify that the source archive stored paths relatively, not absolutely
• !Encrypted PKG files converted to CAB lost their encryption → encryption must be re-applied after format conversion

Related Archive Converters

All Archive Formats

More Archive tools