ZIP vs 7z
A side-by-side feature comparison.
Summary
7z almost always produces smaller files than ZIP using the LZMA2 algorithm, but ZIP is more universally supported. The choice is between size and compatibility.
Feature comparison
| Feature | ZIP | 7z |
|---|---|---|
| Algorithm | DEFLATE (1989) | LZMA2 (modern) |
| Compression ratio | Baseline | Often 30-70% smaller |
| Built into OS? | Every OS | Windows 11 only — needs 7-Zip elsewhere |
| Encryption | AES-256 (modern ZIP) | AES-256 + filename encryption |
| Solid mode | No | Yes — better ratio for many small files |
| Streamability | Yes | Limited |
| Speed | Fast | Slower |
| Open source | Both | Both |
About ZIP
ZIP is the most widely supported archive format on Earth. Created by Phil Katz in 1989 as an open replacement for ARC, it bundles many files into a single .zip container and compresses each one individually using DEFLATE. Every modern operating system can open ZIP files without third-party software, which is why it is the default choice for sharing folders by email or download.
About 7z
7z is the native format of the open-source 7-Zip archiver, designed by Igor Pavlov in 1999. It uses the LZMA family of algorithms and almost always produces smaller files than ZIP or RAR. 7z supports solid compression, where many files are compressed as one continuous stream, and AES-256 encryption with optional filename hiding.
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