Complete Guide to Archive and Compression Extensions: TAR, 7Z, LZ4, and More
Compressing files is one of the most fundamental tasks in computing. Whether you're sending a batch of documents, backing up a server, or optimizing a website, choosing the right compression format can mean the difference between a few megabytes and several gigabytes.
This guide explains the differences between common archive and compression file extensions.
Quick Reference Table: Archive and Compression Formats
| Extension | Full Name | Speed | Compression Ratio | Primary Use |
|---|---|---|---|---|
.tar.gz |
Tarball (Gzip) | Fast | Medium | Linux software distribution |
.tar.xz |
Tarball (XZ) | Slow | Very High | Linux kernel, official source releases |
.7z |
7-Zip | Medium | Very High | General purpose, large file archives |
.zst |
Zstandard (Zstd) | Very Fast | High | Real-time compression, database backups |
.lz4 |
LZ4 | Extremely Fast | Low | High-speed data streams, RAM compression |
.br |
Brotli | Slow (on compress) | Very High | Web assets (JS, CSS, HTML) |
1. The "Tarball" Concept (Archive vs. Compression)
In the Linux/Unix world, we distinguish between archiving (grouping files together) and compressing (making them smaller).
- TAR (.tar): An archive format. It bundles many files into one, but the resulting file is the same size as the sum of its parts.
- Compression Extensions: These are added to the
.tarfile..tar.gz(or.tgz): Compressed with Gzip..tar.bz2(or.tbz2): Compressed with Bzip2 (older, high ratio)..tar.xz: Compressed with XZ (extremely high ratio, slow)..tar.zst: Compressed with Zstandard (modern, fast, and efficient).
2. High-Ratio Powerhouses (.7z, .xz)
If your main goal is to make a file as small as possible, these are your best options.
- 7-Zip (.7z): Uses the LZMA/LZMA2 algorithm. It's often more efficient than standard ZIP files. It's great for backups and large software packages.
- XZ (.xz): Similar to 7-Zip but more common on Linux. It produces tiny files but takes a lot of CPU power to compress them.
3. Real-Time Performance (.zst, .lz4)
In scenarios like log streaming or database backups, you can't wait hours for compression to finish.
- Zstandard (.zst): Developed by Facebook. It is the new industry standard. It can reach compression ratios similar to XZ but at much higher speeds.
- LZ4 (.lz4): The "speed king." It barely uses any CPU, making it perfect for compressing data as it moves through a network or while stored in RAM.
4. The Web's Favorite (.br)
Brotli (.br) was developed by Google specifically for the web.
- Static Assets: It is significantly better than Gzip for text files (HTML, CSS, JS). Modern browsers automatically ask for
.brversions of files to speed up page loads.
5. How to Extract These Files
On Linux / macOS (Command Line)
- Extract .tar.gz:
tar -xzvf file.tar.gz - Extract .tar.xz:
tar -xJvf file.tar.xz - Extract .7z:
7z x file.7z(requiresp7zip) - Extract .zst:
unzstd file.zst
On Windows
- 7-Zip: The most versatile free tool. It handles almost all the extensions listed above.
- WinRAR: Another popular option that handles many formats.
Common Questions (FAQ)
Q: Why is my .tar.gz file larger than my .7z file?
A: Gzip is an older algorithm optimized for speed. 7-Zip (LZMA2) is a newer, more complex algorithm optimized for size. For most data, 7-Zip will produce a smaller file than Gzip.
Q: Should I use .zip or .7z?
A: Use ZIP if you need maximum compatibility (every computer can open it without extra software). Use 7-Zip if you need the smallest possible file size and the recipient has 7-Zip installed.
Q: Is Brotli better than Gzip for my website?
A: Yes. For text-based web assets, Brotli typically achieves 15-20% better compression than Gzip, leading to faster load times for your users.
Related Tools on Tool3M
- Code Minifier: Reduce your JS and CSS file sizes before they are compressed for the web.
- Hash Generator: Verify the checksum of your archives to ensure they haven't been corrupted.