What Is a 7z File?

The basics.

A .7z file (also called "7-Zip archive") is a compressed archive format — like a ZIP or RAR file, but using a compression method called LZMA2 that often achieves smaller file sizes.

Windows and Mac don't natively open .7z files, but free tools handle them effortlessly.

Step-by-Step: Open Your 7z File

Choose your operating system.

Using 7-Zip (Free — Named After This Format!)

Download 7-Zip

Go to 7-zip.org and install the 64-bit version. It's free and takes 30 seconds.

Right-click the .7z file

Find your file in File Explorer, right-click it, and look for 7-Zip in the context menu.

Click "Extract Here" or "Extract to [folder]"

Your files will appear moments later. Enter a password if prompted.

WinZip (opens in new tab) also supports .7z files if you prefer a graphical interface with drag-and-drop.

Why Would Someone Send a .7z Instead of .zip?

A fair question.

Better compression. 7z files are often 30–70% smaller than the equivalent ZIP, which matters for very large files.

Stronger encryption. The .7z format supports AES-256 encryption by default, and unlike ZIP files, it can also encrypt the file names.

The trade-off is that .7z isn't as universally supported. But with 7-Zip or The Unarchiver installed, you'll never have trouble with them again.