7-Zip 26.02
A modern open-source file archiver with support for more than 30 formats and excellent compression performance.
7z Format
A modern archive format with high compression, AES-256 encryption, Unicode support and open architecture.
Main Features
📂 Open Architecture
The format allows adding new compression methods without changing the format itself.
📈 High Compression
LZMA and LZMA2 algorithms provide excellent compression ratio and speed.
🔒 AES-256 Encryption
Strong encryption using the AES-256 algorithm.
🌍 Unicode
Full support for file names in any language.
📦 Huge Archives
Supports archives of almost any size and millions of files.
⚡ Solid Compression
Combines multiple files into a single data stream for better compression.
🗜 Header Compression
Additional compression of archive metadata.
⚙ Flexible
Supports different compression methods and data filters.
Compression Methods
LZMA
The main 7z compression algorithm. Provides maximum compression ratio with reasonable memory usage.
LZMA2
Improved LZMA version. Supports multithreading and modern CPUs.
PPMd
Optimized for text files, source code and documents.
BZip2
Uses Burrows-Wheeler Transform algorithm.
Copy
Stores files without compression. Useful for already compressed data.
Filters
Filters are applied before compression and improve efficiency for executable files, libraries and multimedia data.
LZMA — Main Algorithm
📈 High Compression
One of the best compression algorithms available in modern archivers.
💾 Dictionary up to 4 GB
Large dictionary size improves compression efficiency.
🚀 Compression Speed
Around 2–8 MB/s on modern processors.
⚡ Decompression Speed
Up to 100 MB/s with optimized decoder.
🧠 Low Requirements
Requires significantly less memory for decompression.
📦 Small Decoder
Decoder code size is only a few kilobytes.
Download 7-Zip
Download the latest version of 7-Zip for Windows, Linux and macOS. Choose the package that fits your system.
Windows Releases
Other Platforms
Linux x64
Console version for 64-bit Linux systems.
Linux ARM
Console version for ARM devices.
macOS
Console version for Apple Silicon and Intel Macs.
Developer Packages
📦 Source Code
Full 7-Zip source code for developers.
⚙ LZMA SDK
SDK with C, C++, C# and Java examples.
💻 7zr Console
Standalone command line version of 7-Zip.
🔓 Open Source
Free source code available for modification.
LZMA SDK
Software Development Kit for developers who want to integrate LZMA compression into their applications. Includes documentation, source code, libraries and tools.
LZMA SDK 26.02
Latest SDK release. C, C++, C# and Java support.
Source Code
Full source code examples and compression libraries.
Documentation
Format specification and programming guides.
SDK Releases
What's New
26.02
Bug fixes and security improvements.
26.01
Minor fixes and improvements.
25.01
Improved security when extracting files from archives.
25.00
Support for more than 64 CPU threads during compression.
24.05
Added new filter for RISC-V executables.
23.01
New ARM64 executable filter. Improved BCJ2 compression.
LZMA SDK Includes
💻 C++ Source Code
LZMA encoder and decoder implementation.
⚙ ANSI-C Library
Portable LZMA, LZMA2 and XZ compression code.
🗜 7z Support
Source code for creating and extracting 7z archives.
☕ Java Support
Java implementation for LZMA compression and decompression.
🔷 C# Support
Managed code examples and libraries.
📦 Tools
lzma.exe, 7zr.exe and SFX modules.
LZMA Features
🚀 Compression Speed
2-8 MB/s on modern 4 GHz CPUs.
⚡ Decompression Speed
30-100 MB/s on modern processors.
💾 Low Memory Usage
Only 8-32 KB plus dictionary size for decompression.
📦 Small Decoder
Decoder size from 2-8 KB depending on optimization level.
License
Open Source / Public Domain
LZMA SDK is released into the public domain. Anyone can copy, modify, publish, use, compile or distribute the source code for commercial and non-commercial purposes.
LZMA Links
Frequently Asked Questions
Answers to common questions about 7-Zip, installation, compression, development and integration.
User FAQ
Questions about using 7-Zip, archives and installation.
Developer FAQ
Information about SDK, libraries and integration.
User FAQ
Can I use 7-Zip in a commercial organization?
Yes. 7-Zip is free software. You can use it on any computer without registration or payment.
How do I set file associations in Windows?
Run 7-Zip File Manager as administrator. Then you can configure file associations and application settings.
Why can newer 7z archives be larger?
New versions use a different default file sorting method for solid archives. You can change sorting with the qs parameter.
-mqs
Why can't 7-Zip open some ZIP archives?
Usually this means the archive contains incorrect headers or unsupported compression methods.
Why can't 7-Zip open some RAR archives?
Modern versions support RAR5 archives. Older versions supported only RAR 2/3/4.
Why does drag-and-drop extraction use temporary files?
Windows Explorer requires files to exist before moving them to the target location. 7-Zip uses temporary extraction for this process.
How can I create an archive from command line?
7z.exe a archive.7z folder
The command compresses the selected folder into a 7z archive.
How can I install 7-Zip silently?
7z-installer.exe /S
For MSI packages:
msiexec /q INSTALLDIR="C:\Program Files\7-Zip"
How can I recover a corrupted 7z archive?
Some damaged archives can be partially recovered. Use archive testing and recovery tools.
Developer FAQ
Can I use 7-Zip files in commercial applications?
Yes, but you must comply with the GNU LGPL license and mention that your application uses 7-Zip components.
How can I add 7z support to my application?
You can use:
Can I use 7-Zip source code commercially?
Yes, but modifications to LGPL components must remain under LGPL or GPL licensing.
What languages are supported by LZMA SDK?
Command Line Examples
Create archive
7z a backup.7z files/
Extract archive
7z x archive.7z
Test archive
7z t archive.7z
Add password
7z a -p archive.7z files/
Main Features
High Compression
LZMA and LZMA2 algorithms provide excellent compression ratio and speed.
AES-256
Strong encryption for archives and ZIP files.
30+ Formats
ZIP, 7Z, TAR, GZIP, BZIP2, XZ, ISO, WIM and many more.
Open Source
Completely free for both personal and commercial use.
Windows Explorer
Full integration with Windows File Explorer.
CLI
Powerful command line tools for automation and scripting.