概述
自1989年以来，ZIP一直是文件压缩的标准。7Z是一种较新的开源格式，在压缩方面超过了ZIP。RAR是WinRAR使用的格式。
本指南比较这三种格式，以帮助您选择适合备份、共享和归档的格式。
逐项比较
压缩比
ZIP: ZIP 提供适中的压缩。一个 100MB 的文件夹通常压缩到 60-70MB。
7Z: 7Z 使用 LZMA2 压缩实现比 ZIP 小 20-40% 的输出文件。
Winner: 7Z
兼容性
ZIP: ZIP在Windows、macOS和Linux上均原生支持，无需额外软件。
7Z: 7Z需要7-Zip软件或兼容的归档工具。
Winner: ZIP
加密
ZIP: ZIP 支持 AES-256，但加密时文件列表仍然可见。
7Z: 7Z 支持 AES-256，同时加密文件列表 - 比 ZIP 更安全。
Winner: 7Z
压缩速度
ZIP: ZIP 压缩和解压缩非常快速。
7Z: 7Z 在高压缩级别下的压缩速度比 ZIP 慢。解压缩速度很快。
Winner: ZIP
开源
ZIP: ZIP 是一个开放标准。所有平台上都有免费的工具可用。
7Z: 7Z和7-Zip完全开源且免费。
Winner: 两者均免费
How the Three Archive Formats Differ
ZIP, the long-standing standard since 1989, most commonly uses the DEFLATE algorithm and compresses each file in the archive independently.[1][2] 7Z, the open-source format of 7-Zip, defaults to the LZMA/LZMA2 algorithm, which uses a much larger dictionary and range coding, and supports solid compression that treats multiple files as one continuous stream.[3][4] RAR, the proprietary format behind WinRAR, uses its own dictionary-based algorithm and also supports solid archives and recovery records.[5][6]
Compression Ratio
Solid compression and the large LZMA dictionary generally give 7Z and RAR higher compression ratios than ZIP, especially across many similar files, at the cost of slower processing and the loss of per-file random access.[4] ZIP's independent per-file compression is faster and allows any single file to be extracted without processing the rest, but it cannot exploit redundancy between files, so its archives are typically larger.[2]
Recovery and Encryption
RAR's distinctive features are built-in recovery records, which can repair a partially damaged archive, and clean multi-volume splitting for distributing large archives across several files.[6] All three formats support encryption; 7Z and modern ZIP and RAR offer AES, with 7Z and RAR additionally able to encrypt the list of file names. ZIP's legacy encryption is weak and should not be relied upon, though AES-based ZIP encryption is available in modern tools.[3]
Licensing and Availability
A key practical distinction is openness. ZIP and 7Z are open formats that can be created and read by free software without licensing restrictions.[1][3] Creating RAR archives requires the proprietary WinRAR or its command-line tool, although extracting RAR is more widely supported. This is the main reason RAR, despite strong compression and recovery features, is less commonly chosen for general distribution.[5]
Compatibility and Applications
ZIP is natively supported by Windows, macOS, and essentially every operating system without extra software, making it the default for sharing where compatibility matters most.[1] 7Z is used where maximum free, open compression is the priority and both parties can install 7-Zip or a compatible tool. RAR is used where its recovery records and solid compression are valued and licensed software is available.[5]