Quick Verdict
Use RAR when…
Use RAR if you're distributing multi-part archives (RAR's multi-volume support is more widely understood), need recovery records for corrupted archives, or are sharing with users who have WinRAR installed.
Use 7Z when…
Use 7Z for the best possible compression ratio, completely free software (no trial nags), open-source tooling, and scripting via command-line tools on all platforms.
RAR vs 7Z: Feature Comparison
| Feature | RAR | 7Z |
|---|---|---|
| Compression ratio | Very good | Best (often 10–30% smaller than RAR) |
| Compression speed | Faster | Slower at highest settings |
| Creation software | WinRAR (paid, trial available) | 7-Zip (free, open-source) |
| Extraction software | Free (WinRAR, 7-Zip, macOS native) | Free (7-Zip, many tools) |
| Encryption | AES-128 (RAR4) / AES-256 (RAR5) | AES-256 |
| Multi-volume archives | Excellent, widely understood | Supported |
| Recovery records | Yes (repair corrupted archives) | No |
| macOS native | No (needs The Unarchiver or 7-Zip) | No (needs 7-Zip for Mac) |
When RAR wins
- ✓Compression ratio: Very good
- ✓Compression speed: Faster
- ✓Creation software: WinRAR (paid, trial available)
When 7Z wins
- ✓Compression ratio: Best (often 10–30% smaller than RAR)
- ✓Compression speed: Slower at highest settings
- ✓Creation software: 7-Zip (free, open-source)
Frequently asked questions
Does 7Z compress better than RAR?
In most benchmarks, 7Z with LZMA2 compression achieves 10–30% smaller files than RAR. The gap is largest with compressible data (text, code, documents). For already-compressed content like MP4 or JPEG, neither format reduces size significantly.
Can I create RAR files without buying WinRAR?
Technically no — the RAR format is proprietary and the only official tool to create RAR archives is WinRAR. WinRAR has a perpetual free trial that never expires (though it nags you to buy), but for truly free archive creation you should use 7-Zip (.7z format) or ZIP.
Is 7Z supported on macOS?
macOS does not include native 7Z support. You need a free tool: 7-Zip for macOS (p7zip project), The Unarchiver (free on App Store, opens 7Z files), or Keka. For creating 7Z archives on macOS, 7-Zip for macOS via Homebrew (`brew install p7zip`) is the easiest option.
More comparisons
View all format comparisons →