Convert GZIP to 7Z
Free online converter for GZIP files. High-ratio archive from the 7-Zip project. Nothing to install, no watermark, and every file is deleted automatically.
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Upload a GZIP file to convert it to 7Z. Up to 3 files at once, 100 MB each.
Free · up to 3 files · 100 MB each · files deleted automatically after 1 hour.
About GZ and 7Z
GZIP .gz
A single-stream compressor, not an archive. Gzip compresses one file; bundling many requires tar first, which is why tar.gz is so common.
Good for
- Fast to compress and very fast to decompress
- Universal on Unix systems and across the web
- Streams cleanly through pipes
Trade-offs
- One file only — it cannot hold a directory
- Compresses less than LZMA
- No integrity protection beyond a basic checksum
application/gzip
7Z .7z
The high-compression archive format, using LZMA. It routinely produces the smallest file of anything here, at the cost of time and memory.
Good for
- The best compression ratios available here
- Strong AES-256 encryption
- Solid mode compresses similar files together very effectively
Trade-offs
- Needs software installed on Windows and macOS
- Slow to compress, and memory-hungry
- Less universal than ZIP for sending to other people
application/x-7z-compressed
GZ and 7Z side by side
| GZ | 7Z | |
|---|---|---|
| Compression | Single stream (DEFLATE) | Solid (LZMA) |
| Typically used for | Compressing one file, web transfer encoding | Maximum compression, long-term storage |
What changes when you convert GZ to 7Z
The archive is rebuilt, not renamed
Your GZ is unpacked in full and its contents are written into a new 7Z. Nothing is passed through untouched, so the compression is done again from scratch at the level you choose, and the resulting size depends on that setting rather than on how the GZ was originally made. The folder structure inside is preserved exactly.
These two store files differently
GZ compresses a single stream and has no concept of multiple files, so must be decompressed from the start. 7Z compresses with LZMA, usually the tightest of these formats, so supports random access, though at a higher cost to decompress. That difference is the real reason to pick one over the other: per-file compression lets a tool pull out a single entry cheaply, while compressing everything as one stream finds patterns across files and usually ends up smaller.
Why GZ is read-only here
Plain gzip compresses a single stream and has no concept of files or folders — which is why it is nearly always paired with tar. We accept it as a source and write open multi-file formats instead.
You choose how hard it compresses
Because the archive is built again from scratch, the compression level is yours to set rather than inherited from the GZ. It defaults to 6 — the setting that has been the sensible middle ground for deflate for thirty years. Raising it buys a few percent for a disproportionate amount of time; lowering it is worth doing for large archives of already-compressed material such as photographs or video, where there is nothing left to squeeze.