ZIP vs 7z — compatibility versus compression
ZIP extracts anywhere but compresses less. 7z squeezes more but requires the recipient to have matching tooling. Choose based on the distribution channel.
Quick verdict
- Wide distribution or unknown recipients → ZIP.
- You control the environment and care about size → 7z.
- Strong encryption required → 7z's AES-256, or ZIP with AES-256 if you can confirm the receiver's extractor supports it.
Side-by-side
| Property | ZIP | 7z |
|---|---|---|
| Built-in OS support | Windows / macOS / Linux | Needs 7-Zip, Keka, The Unarchiver |
| Compression ratio | Moderate | High (LZMA2) |
| Encryption | ZipCrypto (weak) or AES-128/256 | AES-256 |
| Multi-volume archives | Yes | Yes |
| Filename encryption | No | Optional |
Password realities
- ZipCrypto can be brute-forced with dictionary attacks. Use AES-128 or AES-256 at minimum.
- Password-protected 7z often gets quarantined by enterprise mail gateways; for business use, share a link and send the password separately.