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Strengthen your PC security with Avast Free Antivirus for Windows 11

Get advanced protection against viruses, spyware, and other malware in real time. Download our award-winning antivirus — it's trusted by over 435 million users worldwide.

Get it for Mac, Android, or iOS

2021
Editors' Choice
2021
Outstanding Security Product
2021
Top Product

Protect your Windows 11 PC with advanced features

Get essential free protection
Strengthen your online security and protect your entire home network, including advanced features such as anti-malware security, Wi-Fi security scans, and more — all completely free.
Enjoy safer shopping and banking online
Browse, shop, and bank safely online without worrying about your financial credentials being compromised. Scan websites to make sure they’re legitimate, so you can avoid fake websites trying to steal your information.
Enjoy top performance
We’re proud to be called the "Antivirus with the lowest impact on PC performance” by AV-Comparatives. Whether you’re working or gaming on your PC, you’re protected in real time — with no delays or interruptions.

Get award-winning antivirus for Windows 11

Avast has earned many accolades, but the best reward is the loyalty of our 435 million users. We enjoy serving the largest community of any antivirus company in the world — and we’re thrilled to continue to protect you when you upgrade your PC to Windows 11.

100% free, 100% protected

Get your free antivirus for Windows 11 and protect your PC from viruses and other malware — and all this protection is yours forever. Plus, get extra features like email shields, hack alerts, Wi-Fi security scanner, and more.

Enjoy all-around, effortless protection

We’re proud to protect millions of Windows PCs. But you don’t have to take our word for it. Check to see how many PCs we’ve protected this week alone:
Avast prevented virus attacks on Windows PCs in the past week. Avast prevented virus attacks on Windows PCs in the United States just last week.
The United States’ Windows 11 PCs are the third most attacked in the world.

The number of attacks prevented against Windows PCs in the past 30 weeks

Already have Avast? We’ve got you covered

If you’re upgrading from older versions of Windows, such as XP, Vista, 7, 8, 8.1, 10, you can keep your new Windows 11 PC virus-free. Make sure you’re running the latest version of Avast before you upgrade. Once you’ve transitioned to Windows 11, you can browse the internet with complete confidence, knowing that both your online security and computer are in safe hands.

How to install Avast Free Antivirus for Windows 11

To start using Avast, just follow these easy steps:
Download the installer by clicking here.
Right-click the installer and click “run as administrator”.
Click “Install”.
When the progress bar vanishes, your PC is protected.
And that's it! Your PC is 100% secure.

System requirements

It doesn’t take much to have a device protected by Avast. All you need is a PC with 1 GB+ RAM and 2 GB of hard disk space. If your Windows 11 PC has that (which it very likely should), you’ll be good to go.

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