Strengthen your PC’s security with Avast Free Antivirus for Windows 11

Get powerful, real-time antivirus protection for your Windows PC or laptop and strengthen your privacy — all with Avast Free Antivirus. It's trusted by over 400 million people worldwide, download it free now.

Free download

Also available for Mac, Android, and iOS

2021
Editors' Choice

2022
Top Rated Product

2023
Top Product

2023
Best Free Anti-Malware

2022
Top Rated Product

Free download

Award-winning free antivirus

Easy to install and simple to use

Wi-Fi network security

30+ years of protecting our users

Windows 11 virus protection that comes with extra features

In today’s digital world, sometimes you need more than antivirus to give you the protection you need — so we’ve included some advanced features alongside our award-winning free antivirus, so you’re covered from all angles.

Get crucial, free virus protection for Windows 11

Strengthen your Windows 11 PC security and protect your entire home Wi-Fi network, plus get advanced tools like anti-malware security, Wi-Fi security scans, and more — all completely free.

Browse, shop, and bank securely

Protect your financial info while you browse, shop, and bank online. Scan websites to make sure they’re legitimate, and avoid fake websites trying to steal your information.

Protect your personal files

Keep sensitive information safe. Protect your personal photos, files, and documents and don’t let them become hostage to ransomware.

You can rely on Avast to protect you

Here’s why Avast is one of the most trusted, reliable, and experienced cybersecurity experts in the world.

World-class protection

We’re proud to protect our users but we’re also proud of the many top awards our antivirus has earned.

435+ million users

Our vast global user base means we have the largest threat detection network in the industry — so we catch new threats fast.

30+ years of experience

When it comes to creating an antivirus that protects you from all angles — we know exactly what it takes.

Easy to install, effortless to use

Our free antivirus software for Windows 11 installs fast, and it’s easy to use. Clear interfaces and settings allow you to set and automate your security, so it’s always running quietly in the background, protecting you in real time, 24/7. And it’s always free — so give it a try now.

Free download

100% free protection

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

Avast Free Antivirus never sleeps

We’re proud to protect millions of Windows PCs. But don’t just take our word for it — see the graph below which shows that Avast has prevented 327,864,249 virus attacks on Windows 11 PCs over recent months.

Number of attacks prevented against Windows 11 PCs in recent months:

Here’s what our users say:

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

Steven

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

Tim

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

“...earns excellent scores in our hands-on tests and independent lab tests...it offers much more than many competing commercial products...”

“Awarded Outstanding Security Product 2021 by AV-Comparatives.”

Avast Free Antivirus

Easy to install, effortless to use

Avast’s antivirus scans for security and performance issues and helps you to fix them instantly. It also protects you in real time by analyzing unknown files long before they reach your Windows 11 PC. And it’s free — so give it a try.

Free download

Also available for Mac, Android, or iOS

Already have Avast? We’ve got you covered

If you’re planning on upgrading from older versions of Windows, such as XP, Vista, 7, 8, 8.1 or 10, we’re ready to keep your Windows 11 PC virus-free. Just make sure you’re running the latest version of Avast before you upgrade your machine, and when you finish the transition to Windows 11, you’ll find us there, right where you left us, ready to protect your PC and everything you hold dear in it.

You may still be wondering...

FAQs

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 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.

Does Windows 11 come with antivirus software?

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.

Is Windows 11 safe?

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

Is the Windows 11 firewall sufficient?

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.

Visit our Support Center for more FAQs

How to install

Get protected right away by following these 3 easy steps:

Step 1

1. Download

Click here to download.

Step 2

2. Open the file

Open the downloaded file and approve the installation.

Step 3

3. Install the file

Run the installer and follow the simple instructions.

System requirements

Windows 10 and Windows 11 compatible

PC with Windows 11, 10, 8.1, 8, or 7 (both the 32 and 64-bit versions, excluding Starter and RT editions), 1 GB RAM and 2 GB of hard disk space.

Mac running macOS 10.12 (Sierra) or later.

Android phone or tablet running operating system Google Android 6.0 (Marshmallow, API 23) or higher.

iPhone or iPad running iOS 12.0 or higher.