Convert Gzip Compressed Archive (.gz) to 7-Zip Archive (.7z) online for free. Fast, secure archive conversion with no watermarks or registration.
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Choose your output settings. The default settings work great for most files.
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GZ (Gzip) is GNU's compression format based on the DEFLATE algorithm, universally present on Unix and Linux systems as the standard single-file compressor. While gzip is fast and ubiquitous, it typically achieves lower compression ratios than modern alternatives. 7Z is the open-source archive format from the 7-Zip project, using LZMA and LZMA2 algorithms that deliver 30-70% better compression than DEFLATE.
Converting GZ to 7Z repacks your gzip-compressed data using the significantly more efficient LZMA2 algorithm. This is particularly valuable for long-term archival storage where every megabyte saved translates to real cost reduction, or when transferring large datasets over bandwidth-limited connections where the improved compression justifies the conversion time.
The primary motivation is compression efficiency. LZMA2 consistently produces smaller archives than DEFLATE across virtually all data types — text files, databases, log files, and binary data all compress significantly better. For archival storage on cloud platforms where you pay per gigabyte per month, the 30-70% size reduction from 7Z can meaningfully reduce costs across large datasets.
7Z also supports advanced features absent from plain GZ: AES-256 encryption for securing sensitive archives, solid compression mode that exploits redundancy across multiple files, and multi-method compression that applies different algorithms to different file types within a single archive. These features make 7Z superior for structured archival workflows.
The gzip stream is decompressed by reading the DEFLATE-compressed data, verifying the CRC32 checksum and original size footer. If the input is a bare .gz file (single compressed file), the decompressed output is directly fed to the 7Z compressor. If the GZ wraps a tar archive (.tar.gz), the tar is extracted first to recover the full directory tree, then all files are packed into a 7Z archive using LZMA2 compression with solid mode enabled by default. LZMA2 uses a dictionary size up to 64 MB (configurable), Markov chain modeling, and range coding to achieve its superior compression ratios.
Entirely lossless. The conversion decompresses the GZ stream and recompresses the identical data into 7Z format. No bytes are altered, lost, or modified. The output 7Z archive contains the exact same file(s) as the original GZ, verified by checksum comparison. Only the compression container changes — the actual file content is preserved bit-for-bit.
| Device | GZ | 7Z |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
GZ to 7Z conversion upgrades your compression from DEFLATE to LZMA2, delivering significantly smaller archives at the cost of slower compression speed and reduced universal tool support. Ideal for archival, bandwidth-sensitive transfers, and encrypted storage.
Безопасная передача
Загрузки зашифрованы по HTTPS
Конфиденциальность прежде всего
Файлы автоматически удаляются после обработки
Без регистрации
Начните конвертировать мгновенно
Работает везде
Любой браузер, любое устройство
| No |
| Характеристика | GZ | 7Z |
|---|---|---|
| Полное название | Gzip Compressed File | 7-Zip Archive |
| Расширение | .gz | .7z |
| Лучше всего подходит для | DEFLATE compression | High compression |