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Free Anti-Ransomware Tool

Stop ransomware in its tracks. Avast Free Antivirus is the award-winning, 100% free anti-ransomware tool that stops dangerous ransomware and other types of threats before they can harm your files.

People love Avast Free Antivirus

6207 people rated us 4.7/5

Free ransomware scanner and ransomware protection

Avast has been stopping ransomware for years, and we’re only getting better with age. We’ll keep your computer and all your files safe from this threat.

Avast Free Antivirus comes with many advantages:

We’ve packed the world’s largest threat-detection network and machine-learning malware protection into a single, lightweight malware scan and removal tool that won’t slow down your PC. And did we mention, it’s 100% free?

Not just known, but respected

Avast has been protecting people for a long time. Your safety is our top priority, and your trust is our biggest reward. But sometimes it feels good to be recognized by the experts, too.


A ransomware scanner trusted by over 400 million users

But don’t just take our word for it.

Macs and mobiles need ransomware protection, too

Ransomware doesn’t only try to hold your PC hostage, it will try to encrypt your files on any device it can access, including your Mac and your mobile phone. Avast can protect and remove the underlying ransomware malware from those devices.

For your Mac, we have the free Avast Security for Mac, which improves your Mac’s impressive built-in security with specialized protection against threats of all kinds. It also scans your wireless network to ensure nothing sneaks in without your knowledge.

For your favorite Android devices, we have another free solution: Avast Mobile Security for Android. Give your phone the same ransomware-stopping power your PC enjoys, plus tools to boost your battery life and find your device if it ever gets lost.

Download our free ransomware protection tool

Avast Free Antivirus is the best free anti-ransomware tool you can get to keep your PC safe, or to remove ransomware from an infected system. And best of all? It’s absolutely free.


How can I prevent ransomware?

The best way to avoid ransomware and other malware is to use a powerful antivirus tool while also practicing safe online habits, such as choosing not to click on strange links or download unknown files.

Is ransomware a virus?

Technically, no. A virus self-propagates, while ransomware encrypts and holds your files hostage. Instead, we classify ransomware as “malware” — which is an umbrella term that encompasses all kinds of threats, including ransomware and viruses.

What if it’s too late?

Even if all your files are encrypted, it might not be too late! For certain strains of ransomware, there are free decryption tools available online. And don’t worry about the claims that these tools will delete your files, as that’s just a bluff to try to get you to pay up. It’s possible to remove ransomware on all your devices — PC, Mac, Android, and of course, iPhone.

System requirements

We’re not demanding. All you need is a PC with Windows 10, 8.1, 8 or 7*, 1 GB RAM 
and 2 GB of hard disk space. And that’s it.

* Both the 32- and 64-bit versions, excluding Starter and RT editions.

Windows 10 compatible

Get free threat protection for your iPhone with Avast Mobile Security


Get free ransomware protection for PC with Avast Free Antivirus


Get free ransomware protection for Mac with Avast Security


Get free ransomware protection for Android with Avast Mobile Security