Specifying 'for Windows' in the search suggests you already know ClamAV started life as a Linux mail-server scanner and want reassurance the Windows build is a proper, current release rather than an afterthought — it is, maintained directly by the ClamAV project under Cisco. Most Windows users pair it with a GUI front end like ClamWin since the core ClamAV package is command-line by default. It's a solid on-demand scanner rather than a full real-time antivirus replacement, which is worth knowing before you install it as your only protection.
Command-Line Core, GUI Optional
The official ClamAV package for Windows installs as a set of command-line tools (clamscan, freshclam for signature updates) rather than a click-and-scan application, which surprises users expecting a typical AV interface.
It's licensed under the GPL and widely used for on-demand and scheduled scanning — many admins run it as a secondary scanner alongside Windows Defender rather than a full real-time replacement.
Who ends up using ClamAV
ClamAV is mostly picked up by system admins and technical users who want an open-source scanning engine rather than a full consumer antivirus suite.
- Mail server admins scanning inbound attachments for known malware signatures
- Linux and Windows sysadmins running scheduled command-line scans across shared file servers
- Technical users wanting a free secondary scanner to run alongside Windows Defender
Before you install
A couple of things worth knowing about ClamAV before you request the link: it covers Windows, macOS and Linux, so pick the right build for the machine you're setting up. And on pricing, ClamAV is open source, so the installer is free with no trial timer, feature lock, or upsell screen to click past. It's developed and maintained by Cisco (ClamAV Project).
System requirements
- WindowsWindows 10 or 11 (64-bit); older 7/8.1 builds usually still run but no longer get official support
- macOSa recent macOS release — check the download page for the current minimum version, since Apple Silicon vs Intel builds sometimes differ
- Linuxmost current 64-bit distributions; look for a native .deb/.rpm/AppImage or a package in your distro's own repository
Heavier workloads (large files, high-res media, big projects) will naturally want more RAM and a faster CPU/GPU than the bare minimum.
Quick steps
- Download the Windows installer package linked below
- Run freshclam once after install to pull the latest virus definitions
- Scan a folder with clamscan, or install a GUI front end for point-and-click use
ClamAV: the honest trade-offs
- Fully open-source engine with signature updates actively maintained by Cisco and the ClamAV project
- Scriptable command-line tools fit easily into cron jobs and server automation
- Cross-platform support across Windows, macOS, and Linux from one project
- No real-time protection out of the box — it's on-demand and scheduled scanning only
- Windows package ships with no GUI, requiring a separate front end like ClamWin
This links to the ClamAV project's official Windows build maintained by Cisco — the same source enterprise mail scanners pull from.
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Keeping ClamAV up to date
Since ClamAV is open source, most Linux distributions keep it current through their own package manager. On Windows/macOS, re-running the installer from the official site (or an updater built into the app, if it has one) gets you the latest release. Sticking to the developer's own distribution channel — which is what this page links to — means you're never stuck on an old build with unpatched bugs just because a mirror site stopped updating its copy.
Features, install steps, alternatives and more detail live on the main ClamAV page.
Frequently asked questions
Does ClamAV replace Windows Defender for real-time protection?
Not by default — the core tool is an on-demand/scheduled scanner, so most people run it alongside Defender rather than instead of it.
Why does ClamAV only give me a command line?
The official package is the scanning engine itself; a GUI is a separate, optional add-on like ClamWin.
