RAR vs 7Z Format Comparison
Detailed comparison of RAR and 7z archive formats. Compression, price, features, open source.
Price: 7z Wins
7z is completely free and open source. RAR creation requires WinRAR, which is paid (with a nag screen trial). 7-Zip can extract RAR for free but cannot create it.
Compression: Comparable
Both RAR and 7z offer excellent compression. In most tests, 7z with LZMA2 matches or slightly exceeds RAR compression ratio. The difference is usually within 5%.
Open Source: 7z Wins
7z is open source (LGPL license). RAR is proprietary — the compression algorithm is a trade secret. Open source allows independent security audits.
Recovery: RAR Wins
RAR has a built-in recovery record feature that can repair damaged archives. 7z does not have this feature. If archive integrity over unreliable media is critical, RAR has an advantage.
Filename Encryption: Both Support
Both RAR5 and 7z support encrypting filenames, hiding the contents list without the password. Older RAR4 does not support this.
Verdict
For most users, 7z is the better choice: it's free, open source, offers excellent compression, and supports all needed features. RAR's only unique advantage is the recovery record. Choose 7z unless you specifically need RAR compatibility.
RARの他のガイド
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無料・オープンソース・公式ダウンロード