SoftNexi

Windows · Compression & Archives

7-Zip for Windows

Free, open-source file archiver with the 7Z format, strong AES-256 encryption, and a fast multi-core compressor.

Updated July 21, 2026 · Reviewed by SoftNexi Editorial Team, Software research and documentation

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Overview

7-Zip is a free file archiver written by Igor Pavlov and distributed under the GNU LGPL. It creates 7Z and ZIP archives and extracts around thirty formats, including RAR, TAR, ISO, CAB, and DMG.

Its main advantage is the 7Z format itself. With LZMA2 compression, 7Z typically produces noticeably smaller archives than ZIP on documents, source code, and other text-heavy data, and it supports AES-256 encryption with an option to encrypt file names as well as contents.

The interface is deliberately plain: a two-pane file manager plus Windows shell integration, so most people use it entirely from the right-click menu. There is no account, no telemetry prompt, and no paid tier.

Key features

  • Creates 7Z and ZIP archives; extracts RAR, TAR, GZ, ISO, CAB, DMG, and more
  • AES-256 encryption for 7Z and ZIP, with optional file name encryption for 7Z
  • Multi-threaded LZMA2 compression that scales across CPU cores
  • Split archives into fixed-size volumes for upload or storage limits
  • Windows shell integration for right-click compress and extract
  • Self-extracting archives for recipients without an archiver
  • Command-line version (7z.exe) for scripting and scheduled jobs

System requirements

Operating system
Windows 11, Windows 10, and earlier Windows releases
Architecture
x64, ARM64, or x86 build must match your Windows install
Disk space
Under 10 MB installed
Permissions
Administrator rights for the installer; a portable build is also offered

How to install 7-Zip

  1. 1. Download from the developer

    Open 7-zip.org/download.html and pick the .exe that matches your Windows architecture — x64 for most modern PCs, ARM64 for Snapdragon-based machines.

  2. 2. Run the installer

    Approve the User Account Control prompt. The default install path under Program Files is fine for most setups.

  3. 3. Confirm shell integration

    Open 7-Zip from the Start menu, then Tools > Options > 7-Zip and enable the context menu entries you want to appear on right-click.

  4. 4. Verify it works

    Right-click any folder, choose 7-Zip > Add to archive, and confirm the archive dialog opens.

How to use it

  1. 1. Compress a folder

    Right-click the folder, choose 7-Zip > Add to archive, set the format to 7z, and leave the compression level at Normal unless size matters more than time.

  2. 2. Encrypt an archive

    In the Add to archive dialog, type a password and check Encrypt file names. Only the 7z format supports encrypted names; ZIP encrypts contents only.

  3. 3. Split a large archive

    Use Split to volumes, bytes and enter a size such as 1900M for DVD-sized parts or 25M for email attachments.

  4. 4. Extract safely

    Choose Extract to \folder\ so the contents land in their own directory instead of scattering across your current folder.

Safety and privacy

  • The only download location we link to is 7-zip.org, the developer's own site. Copies distributed by download portals may be repackaged.
  • 7-Zip is open source, so the code behind each release is publicly reviewable.
Bundled software
The official installer contains no bundled offers, toolbars, or opt-out extras.
Privacy
7-Zip works entirely offline. It does not require an account and does not include an update service that reports back to the developer, which also means you should check for updates yourself.

Known risks

  • Archive tools are a regular target for vulnerability research. Keep 7-Zip current, and be cautious with archives from unknown senders.
  • Extracting an archive does not make its contents safe: scan executables before running them.

What's new

  • 24.x series

    Recent 24.x releases focused on ARM64 support, ZIP and TAR handling fixes, and improvements to the extraction of large archives. Check the developer's download page for the current release notes before installing.

Pros and cons

Pros

  • Genuinely free with no paid tier or nag screens
  • 7Z with LZMA2 is one of the strongest general-purpose compressors available
  • AES-256 with encrypted file names
  • Tiny install footprint and a portable build
  • Scriptable command-line version

Cons

  • The interface looks dated next to commercial archivers
  • Cannot create RAR archives (extraction only)
  • No built-in update checker, so you have to watch for new releases
  • Cloud and repair features found in paid tools are absent

Verdict

For Windows users who need more than the built-in ZIP support, 7-Zip is the default recommendation: free, open source, small, and strong at exactly the job it claims. The interface is the only real compromise.

Frequently asked questions

Is 7-Zip free for commercial use?

Yes. 7-Zip is released under the GNU LGPL, which permits use in a business without a license fee.

Can 7-Zip open RAR files?

Yes, it extracts RAR and RAR5 archives. It cannot create them, because the RAR compression format is proprietary.

Is 7-Zip safe to install?

The build published on 7-zip.org contains no bundled software. We have not independently verified installer checksums, so treat the developer's site as the source of truth and avoid mirrors.

7Z or ZIP — which should I send someone?

Send ZIP if you are unsure what the recipient has, because Windows and macOS open it without extra software. Use 7Z when size or encrypted file names matter.