7-Zip
High-compression file archiver supporting ZIP, 7z, RAR, TAR, and many formats.
Open the official app on www.7-zip.org
This tool is hosted by its maintainers. Click below to open www.7-zip.org in a new tab — it's their official demo.
Browse developer tools →What's next with 7-Zip?
Choose how you want to get started.
Use it free
Open the official tool or demo — no account needed.
Self-host it
Run the open-source version on your own infrastructure.
What is 7-Zip?
7-Zip is a free, open-source file archiver designed to compress and decompress data with high efficiency. It uses the 7z format, which employs advanced algorithms like LZMA and LZMA2 to achieve superior compression ratios compared to older formats such as ZIP and GZIP. The tool is widely used by developers, system administrators, and power users who need to manage large datasets, reduce storage costs, or streamline data transfer. Its open-source nature under the LGPL-2.1 license allows for customization and integration into other software. 7-Zip addresses the challenge of balancing file size reduction with speed, making it ideal for scenarios where storage optimization and reliable data preservation are critical.
How it works
7-Zip is a software utility that compresses and decompresses files into various archive formats. It is distributed under the GNU Lesser General Public License (LGPL-2.1), allowing users to freely use, modify, and distribute the software while maintaining compatibility with proprietary applications. The primary purpose of 7-Zip is to provide efficient data compression, enabling users to store or transfer files in a compact form. Its support for the 7z format, which combines LZMA compression with strong error recovery, makes it a preferred choice for users requiring both high compression and data integrity. 7-Zip supports a wide range of formats, including 7z, XZ, BZIP2, GZIP, ZIP, and WIM for both packing and unpacking. It also handles decompression for over 30 formats like RAR, ISO, and DMG. The tool’s compression ratio for ZIP and GZIP files is 2-10% better than PKZip and WinRAR, making it suitable for backup and distribution tasks.
How to use it
- 1Download the 7-Zip installer from the official website (7-zip.org) for Windows platforms (x86, x64, or ARM64). 2. Run the installer and follow prompts to customize settings like default archive locations. 3. Launch the 7-Zip File Manager or use command-line tools to select files or folders. 4. Right-click to compress files into 7z, ZIP, or other formats, or use the command line for batch processing. Practical tips: Use the command-line interface (CLI) for scripting automation. For large archives, enable the 'Split to volumes' option to manage file size limits. Always verify checksums for downloaded files to ensure integrity.
What it can do
- file archiver
Use cases
Assumptions and limitations
Assumptions
- source: https://github.com/ip7z/7zip
- license: LGPL-2.1 — free to use
- privacy: Self-hosted — you control your data
Limitations
- Limited graphical interface for non-Windows platforms (primarily Windows-centric)
- No built-in cloud storage integration for direct file syncing
- Requires external libraries like unRAR for full format support
- Command-line interface may have a steeper learning curve for novice users
- LZMA compression can be slower than ZIP for small files
Understanding the result
High-compression file archiver supporting ZIP, 7z, RAR, TAR, and many formats.
Tool details
- Clearly flagged when a network request is needed.
- No account, no sign-up, and no tracking of your content.
- Powered by (MIT).
- Built with
- (ip7z/7zip)
- License
- MIT
- Runs locally
- No — requires a network request
- Verification
- Not yet verified
- Input
- Query
- Output
- Text
Built with ip7z/7zip. OpenToolVault provides the discovery and browser interface while crediting the original project maintainers.
- Built with
- License
- MIT
Open-source project
OpenToolVault is an independent directory. We are not affiliated with or endorsed by this project.
References
- / — GitHub Repository
Upstream project · GitHub
- LGPL-2.1 License
Upstream project
Frequently asked
What licensing terms apply to 7-Zip?
7-Zip is released under the GNU Lesser General Public License version 2.1 (LGPL-2.1), which allows users to freely use, modify, and distribute the software. Most code is LGPL-licensed, with some components under BSD 3-clause and unRAR restrictions. Commercial use is permitted without registration or payment, but derivative works must comply with LGPL requirements.
How does 7-Zip achieve better compression than ZIP?
7-Zip uses the LZMA and LZMA2 algorithms, which provide higher compression ratios by efficiently encoding repeated data patterns. Unlike ZIP’s DEFLATE algorithm, LZMA employs a more advanced dictionary-based approach, allowing it to reduce file sizes further. This makes 7-Zip particularly effective for text files, archives, and datasets with redundant information.
How do I compress a folder into a 7z archive using the command line?
Open a terminal or command prompt, navigate to the folder containing files, then run: '7z a -t7z archive.7z *' to compress all items into a 7z file. Use '7z a -tzip archive.zip *' for ZIP format. Add '-mx9' to the command for maximum compression level. Replace 'archive.7z' with your desired output name.
How does 7-Zip compare to WinRAR and 7-Zip alternatives?
7-Zip outperforms WinRAR in compression ratios for ZIP and GZIP files but lacks native RAR format support without the unRAR library. Unlike proprietary tools like WinRAR, 7-Zip is open-source and free to use. Alternatives like PeaZip offer cross-platform support and a GUI for Linux/macOS, but 7-Zip remains superior for its LGPL licensing and advanced compression algorithms.
How do I fix the '7z: error: cannot open archive' issue?
This error typically occurs when the archive is corrupted or the file path contains special characters. Verify the archive’s integrity by downloading it again. Ensure filenames use standard characters (avoid spaces or symbols). Check that the 7-Zip executable has correct permissions. If using command-line tools, ensure the archive path is correctly specified and the file is not locked by another process.