7Z vs TGZ — Differences, File Size & When to Use Each

7Z vs TGZ

A detailed comparison of 7-Zip Archive and Tarball (gzipped) — file size, quality, compatibility, and which format to choose for your workflow.

Convert TGZ → 7Z

7-Zip Archive

Archives & Compressed

7z uses the LZMA2 compression algorithm to achieve significantly better compression ratios than ZIP. It is open-source and supports strong AES-256 encryption.

About 7Z files

TGZ

Tarball (gzipped)

Archives & Compressed

TGZ is a tar archive compressed with gzip, standard for Unix/Linux distribution.

About TGZ files

Strengths Comparison

7Z Strengths

Outstanding compression ratio — typically 20–50% smaller than ZIP, 10–30% smaller than RAR.
Completely free and open source.
AES-256 encryption of both content and filenames.
Supports enormous archives (16 exabytes).
Multi-threaded compression on modern CPUs.

TGZ Strengths

Universal Unix/Linux compatibility.
Decades of tool and process maturity.
Fast decompression (zlib).
Streamable via pipes.

Limitations

7Z Limitations

Not natively supported on Windows before Windows 11 23H2 or macOS — requires a separate tool.
Slower compression than ZIP (though decompression is fast).
No built-in recovery records like RAR.
Less ubiquitous in email and casual sharing than ZIP.

TGZ Limitations

Compression ratio lags xz, zstd, brotli.
No random access — must extract sequentially.
Windows tooling less native than on Unix.

Technical Specifications

Specification	7Z	TGZ
MIME type	application/x-7z-compressed	application/gzip
Compression	LZMA, LZMA2, PPMd, Bzip2, DEFLATE	—
Max file size	16 EB (exabytes)	—
Encryption	AES-256 (content + filenames)	—
License	LGPL	—
Extensions	—	.tgz, .tar.gz
Container	—	TAR (POSIX) + gzip (DEFLATE)
Alternative	—	.tar.xz (better ratio), .tar.zst (faster)

Typical File Sizes

7Z

Source code archive ~50% smaller than ZIP
Linux distro installer 2–10 GB
Virtual machine disk image 5–40 GB

TGZ

Source code archive 15-30% of original
Linux kernel source (.tar.gz) ~200 MB

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Frequently Asked Questions

7Z is an open-source archive format from the 7-Zip project. It uses the LZMA2 compression algorithm which achieves significantly better compression ratios than ZIP or RAR, making it ideal for archiving large files and datasets.

7Z is an open-source archive formato de the 7-Zip project. It uses the LZMA2 compressão algorithm which achieves significantly better compressão ratios than ZIP ou RAR, making it ideal para archiving large arquivos e datasets.

7Z files open with 7-Zip (free, Windows), PeaZip (cross-platform, free), Keka (macOS), and The Unarchiver (macOS). Windows does not natively support 7Z, so third-party software is required.

7Z arquivos abrir com 7-Zip (free, Windows), PeaZip (cross-platform, grátis), Keka (macOS), e The Unarchiver (macOS). Windows does not natively support 7Z, so third-party software is required.

Use 7Z when maximum compression is the priority, such as software distribution and backups. Use ZIP when the recipient needs to open the file without installing extra software, since ZIP is natively supported everywhere.

Use 7Z when máximo compressão is the priority, como software distribution e backups. usar ZIP when the recipient needs to abrir o arquivo sem installing extra software, since ZIP is natively suportado everywhere.