How to Extract Z Files on Mac

UnFox extracts Z (Unix compress) files on Mac with drag and drop simplicity. The .Z extension indicates files compressed with the original Unix compress utility using the LZW algorithm. This legacy format predates gzip and is rare in modern use but still exists in historical archives and older Unix systems.

What Is a .Z File and Where Does It Come From?

Files with the .Z extension were compressed using the original Unix compress command, which uses the LZW (Lempel Ziv Welch) algorithm. Unix compress was the standard compression tool on Unix systems from the 1980s until gzip replaced it in the early 1990s. The .Z format produces larger compressed files than modern alternatives like gzip, bzip2, or LZMA. Users encounter .Z files when accessing old FTP archives, legacy Unix system backups, and historical software distributions.

How Do You Decompress a .Z File on Mac?

Drag the .Z file onto UnFox. The app detects the LZW compression header and decompresses the file to your chosen destination.

Tip

macOS Archive Utility may handle some .Z files, but behavior varies by version. UnFox provides consistent decompression across all supported macOS releases.

macOS may also handle some .Z files through Archive Utility, but behavior varies by macOS version. UnFox provides consistent decompression with progress tracking across all supported macOS versions.
Marcel Iseli
Marcel Iseli

Creator of UnFox · Indie Developer

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Marcel Iseli is an indie developer and the creator of UnFox. He builds native macOS and iOS utilities focused on privacy, simplicity, and zero tracking. Based in Switzerland, every app he ships is a one time purchase with no subscriptions and no data collection.

Frequently Asked Questions

.Z files use Unix compress (LZW algorithm) and contain a single compressed file. ZIP files use Deflate compression and can contain multiple files. They are completely different formats.
macOS may handle some .Z files through Archive Utility, but support varies. UnFox provides reliable .Z decompression with progress tracking on all macOS 14+ versions.