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What is it
ZIP is the universal archive format — it bundles files together with lossless compression, and every operating system on the planet can open it without installing anything. The envelope of the internet. Phil Katz created it in 1989, and it has outlived almost every technology from that era. Nothing is lost or degraded. It supports password protection (though the older ZipCrypto encryption is weak — use AES-256 if security matters). Most things you download from the web arrive as ZIP files. It is not the most efficient compressor — 7z and RAR squeeze harder — but compatibility is king, and ZIP wears the crown.
Technical details
Safety
What opens it
Built-in OS support
7-Zip
The Unarchiver
FAQ
How do I open a ZIP file?
On Windows and macOS, just double-click it — the OS handles ZIP natively. On Windows you can also right-click and select 'Extract All'. For advanced features, use 7-Zip (free).
What is the difference between ZIP and RAR?
ZIP is universal — every OS opens it natively. RAR often compresses slightly better but requires third-party software to open. Use ZIP when you want maximum compatibility. Use RAR if you need better compression and know your recipient has the tools.
How do I password-protect a ZIP file?
On Windows, use 7-Zip: right-click → 7-Zip → Add to Archive, then set a password and choose AES-256 encryption. On macOS, use the Terminal command: zip -e archive.zip files. Avoid the older ZipCrypto method — it can be cracked.
What is the difference between ZIP and 7Z?
7Z (7-Zip) typically achieves 10–30% better compression than ZIP using the LZMA2 algorithm. But 7Z requires 7-Zip or compatible software to open, while ZIP works everywhere. For archiving your own files, 7Z saves space. For sending files to others, ZIP is the safer bet.
Related formats