TAR.7Z (T7Z) to ZIP Converter
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About formats
TAR.7Z is a compound archive format that combines the TAR container with 7-Zip's LZMA/LZMA2 compression. The TAR layer bundles multiple files into a single stream preserving Unix metadata (permissions, ownership, symlinks), while the outer 7Z compression applies LZMA or LZMA2 to the entire stream. This combination leverages LZMA's superior compression ratios — typically 30-70% better than gzip — making TAR.7Z one of the most space-efficient archive formats for Unix-style backups and software distribution. The solid-stream approach means compression can exploit redundancy across all archived files rather than compressing each file independently. One advantage is maximum compression density: the TAR.7Z combination often produces the smallest archives among common Unix archive+compression pairings. Broad tool support is another strength — tar and 7-Zip are available on all major platforms, and many modern tar implementations can create and extract TAR.7Z archives directly with the appropriate flag. The format is popular for distributing large source code trees and backup archives where minimizing transfer size justifies the additional compression time.
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.