什么是 7Z（7-Zip 压缩文件）？
7Z 文件格式完整指南
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What is it?
7Z 是免费的开源 7-Zip 工具的本地压缩格式。它使用 LZMA 压缩算法，提供比 ZIP 和 RAR 显著更好的压缩效果。
对于许多文件类型，7Z 的压缩效果比 ZIP 提高 30-70%，同时完全免费和开源，使其成为最大压缩而不产生费用的最佳选择。
Technical Specifications
Pros & Cons
Advantages
7Z achieves the highest compression ratios of any common archive format.
7-Zip is free and open-source - no paid software required to create 7Z files.
Strong encryption for secure password-protected archives.
7Z supports files and archives up to 16 exabytes.
Disadvantages
7Z is not natively supported by Windows or macOS - requires 7-Zip software.
Maximum compression with LZMA uses significant CPU time and memory.
Many users are not familiar with 7Z format compared to ZIP.
Unlike RAR, 7Z does not have built-in error recovery records.
When to Use It
以下是 7Z（7-Zip 压缩文件）是正确选择的最常见情况：
Maximum Compression
Use 7Z when ZIP is too large and you want the best compression for free.
Software Distribution
7Z is excellent for distributing large software packages efficiently.
Backup Archives
7Z creates very compact backups with strong encryption.
Sharing Large Files
When file size limits are a concern, 7Z minimizes archive size.
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Start Converting NowFrequently Asked Questions
Is 7Z better than ZIP?
7Z achieves significantly better compression than ZIP. Use 7Z for maximum compression, ZIP for maximum compatibility.
How do I open 7Z files?
Download and install 7-Zip (free) from 7-zip.org. Windows 11 24H2 includes basic 7Z support natively.
Is 7Z better than RAR?
7Z generally compresses better than RAR and is free/open-source. RAR has better error recovery. Both are excellent.
How do I create 7Z files?
Install 7-Zip, right-click files, and select “7-Zip > Add to archive...” Choose 7Z as the format.
Is 7Z encryption secure?
Yes, 7Z uses AES-256 encryption which is extremely secure when using a strong password.