TAR.Z (TZ) to ZIP Converter
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About formats
TAR.Z is a compound archive format combining TAR archiving with Unix compress, one of the earliest general-purpose data compression tools available on Unix systems. The compress utility, originally written by Spencer Thomas, Joe Orost, and others around 1985, implements adaptive LZW (Lempel-Ziv-Welch) compression — a dictionary-based algorithm that builds a translation table during compression and decompression. The TAR layer bundles files with full Unix metadata into a single stream, and compress reduces the stream size typically by 40-60%. TAR.Z was the standard compressed archive format on Unix systems throughout the 1980s and early 1990s, before gzip emerged as a patent-free replacement. The LZW algorithm used by compress was subject to patent claims by Unisys (holders of the LZW patent through Sperry), which motivated the development of gzip as an unencumbered alternative. One advantage is universal legacy compatibility — TAR.Z files can be extracted on any Unix system, including very old installations where newer compression tools may not be available. The format's historical ubiquity means that decades of archived software, documentation, and system backups exist as TAR.Z files. While TAR.GZ and TAR.XZ have replaced TAR.Z for new archives, the uncompress/zcat tools remain standard on all Unix-like systems, ensuring continued accessibility of legacy archives.
ZIP is the most widely used archive format in computing, originally created by Phil Katz and released by PKWARE on February 14, 1989 as part of the PKZIP utility for MS-DOS. The format stores each file independently within the archive, compressing entries individually using the Deflate algorithm (most commonly) and recording a central directory at the end of the file that provides a table of contents for rapid access to any entry without scanning the entire archive. ZIP supports multiple compression methods (Stored, Deflate, Deflate64, BZIP2, LZMA), AES encryption, ZIP64 extensions for files and archives exceeding 4 GB, and Unicode filename encoding. The format's open specification, published by PKWARE as the .ZIP Application Note, enabled broad independent implementation and contributed to ZIP becoming the de facto standard for file distribution. One advantage is native operating system support — Windows, macOS, and most Linux desktop environments handle ZIP files without any third-party software, making it the safest choice for sharing compressed files with unknown recipients. The per-file compression architecture is another key strength: individual files can be extracted or updated without reprocessing the entire archive, and a corrupted entry does not affect other files. ZIP's role extends beyond simple archiving — it serves as the structural foundation for JAR, EPUB, DOCX, PPTX, ODP, APK, and numerous other container formats that package multiple resources into a single file.