Download free antivirus software for Windows 11

It’s 100% compatible. Microsoft supports Avast Free Antivirus on all Windows 11 devices. You can easily download and run the installer in minutes and be protected right away.

Windows 11 has a built-in security center where you can enable basic security tools. Even though Microsoft Windows comes with Windows Defender built-in, it’s not enough protection. Luckily, Microsoft makes it easy to install antivirus software that specifically provides advanced protection and security, such as Avast Free Antivirus.

This antivirus can detect any security weaknesses in real time and blocks viruses, spyware, Trojans, and other types of malware — all completely free.

Yes, it’s safe and free to upgrade to Windows 11, just as Windows 10 was a free upgrade for PCs running Windows 7 and Windows 8. As long as your PC meets Microsoft's minimum system requirements, you’ll be able to access Windows 11 minimal security features.

To make your PC safer, we recommend using an effective free antivirus to add an extra layer of online security and a secure VPN to encrypt your connection for greater privacy.

Windows 11 is a more secure operating system than older versions of Windows. To get the most secure version of Windows 11, you can find new security features in the Windows Operating System.

You can combine the new security features with antivirus software to make your PC even more secure. Avast Free Antivirus can make sure malicious websites and vulnerable Wi-Fi networks don’t jeopardize your online safety. It also includes advanced features like web and email shields, Wi-Fi security scanners, and more.

Not at all. Based on AV-Comparatives, Avast Free Antivirus provides the lowest impact on PC performance. Whether you use your PC for gaming or for work, Avast gives you reliable protection without affecting the performance of your PC at any time.

You can boost the performance of your PC further by using our cleanup tool to clean up, speed up, and tune up your device.

Yes, Windows comes with its own built-in protection called Windows Defender, which offers basic protection but won’t fully protect you against all threats. It’s recommended that you install an individual antivirus, like Avast Free Antivirus, to ensure that there are no gaps in your security and that you’re always completely protected — even from advanced threats.

Yes, Windows 11 is a very safe product. It was created by Microsoft and is used by people all over the world.

Windows firewall will provide some protection but we recommend using an advanced firewall like the one included in Avast Free Antivirus. It offers comprehensive protection against unauthorized communications and intrusions to your system.