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.

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2021
Editors' Choice

2021
Outstanding Security Product

2021
Top Product

PCMag Editor's Choice

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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.

2021

Editors' Choice

PCMag

2021

Outstanding Security Product

AV-Comparatives

2021

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.

What our customers have to say

Very nice! It saved me from a spion virus that was stealing my passwords!

Tim

I feel secure and have peace of mind knowing I am safe. Thank you.

Steven

Awesome! In less than 30 days of using Avast, I could tell we were going to have an even longer relationship! No slowdowns, no malware, and no flaws in general, great job!

Michael

I’ve been using Avast since almost 2009... since then I've never turned to any other antivirus. Don't take my word for it, just try it & see for yourself...

Soumik

It is the best antivirus ever created!

Ognjen

We’ve been using Avast for more than 10 years now. It’s amazing that you can get something as good as this for free.

Austin

Definitely the best antivirus & anti-malware product out on the market. I recommended it to my family and friends!

Bray

It’s the best antivirus ever. I strongly recommend it.

Siyabonga

Excellent antivirus program. I’ve been using this program for 5-6 years without a single issue.

Norm

Hats off to the top notch features Avast provides. My favorite antivirus of all time.

Salman

Great product, Never got a virus since I started using it several years ago.

David

The best free antivirus no doubt. I’ve been using it since 2006 till now without any issues or viruses on my machine.

Sanjeev

The best antivirus for Windows 11.

Shrish

My favourite antivirus because of its high security and no slow down. Thanks.

3xper'

The best antivirus.

John

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FAQ

Is Avast Free Antivirus compatible with 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.

Does Windows 11 need an antivirus?

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.

Is it safe to upgrade to Windows 11?

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.

Does Windows 11 have better security than older versions?

Windows 11 is a more secure operating system than the 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.

Will Avast Free Antivirus affect the performance of your Windows 11 PC?

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.

Visit our Support Center for more FAQs

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Strengthen your PC security with Avast Free Antivirus for Windows 11

Protect your Windows 11 PC with advanced features

Get essential free protection

Enjoy safer shopping and banking online

Enjoy top performance

Get award-winning antivirus for Windows 11

100% free, 100% protected

Enjoy all-around, effortless protection

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

Already have Avast? We’ve got you covered

How to install Avast Free Antivirus for Windows 11

System requirements

What our customers have to say

Tim

Steven

Michael

Soumik

Ognjen

Austin

Bray

Siyabonga

Norm

Salman

David

Sanjeev

Shrish

3xper'

John

FAQ

Is Avast Free Antivirus compatible with Windows 11?

Does Windows 11 need an antivirus?

Is it safe to upgrade to Windows 11?

Does Windows 11 have better security than older versions?

Will Avast Free Antivirus affect the performance of your Windows 11 PC?

Share this article:

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