ZIP vs 7Z vs RAR: What's Actually Different Between Archive Formats

ZIP, 7Z, and RAR all do fundamentally the same job — bundling and compressing files — but they differ in compression efficiency, compatibility, and, in RAR's case, who's actually allowed to create one.

ZIP: the universal default

ZIP is the oldest and most broadly supported of the three — every major operating system can open a ZIP file natively, with no extra software required. Its compression isn't the most space-efficient available, but for everyday use — sending a folder of documents, bundling a few files for upload — that gap rarely matters, and universal compatibility is usually worth more than a marginally smaller file.

7Z: better compression, less universal

7Z (7-Zip's native format) generally achieves stronger compression than ZIP, meaning a smaller resulting file for the same content — useful when you're archiving something large, like a folder of high-resolution images or a big project directory. The tradeoff is that not every operating system opens 7Z natively; some systems need dedicated software installed first, which makes it a better choice when you control both ends of the exchange (archiving your own backups, for instance) than when sending a file to someone whose setup you don't know.

RAR: why you can open one but not make one

RAR is a proprietary format owned by WinRAR — and that's the specific reason RAR creation isn't available in most tools, including this one: only WinRAR's own software is licensed to create RAR archives. Reading and extracting RAR files is a different matter and is broadly supported, since the format's read specification is more widely implemented. In practice, this means you'll regularly need to open a RAR archive someone else sent you, but if you need to create a compressed archive yourself, ZIP, 7Z, or a similar open format is what's actually available to you.

TAR and GZ: common outside Windows and Mac

TAR and GZ (often combined as TAR.GZ) are the standard archive formats in Unix and Linux environments, including most software distributed for those systems. TAR itself just bundles files together without compressing them; GZ compression is typically applied on top. If you're working in a Linux-centric environment or downloading open-source software, these are the formats you'll run into most.

Which one should you actually use?

For sending files to someone else: ZIP, since you can be confident they'll be able to open it without installing anything extra. For your own storage or backups where you control both ends: 7Z, for the smaller resulting file size. For opening something someone sent you: whatever format it arrived in — extraction tools generally handle all of them, RAR included.

Create Archive builds ZIP, 7Z, TAR, or GZ archives using a real 7-Zip engine compiled to run in your browser, and Extract Archive opens any of those plus RAR files, letting you browse and pull out individual files without extracting everything at once.