Get the world’s #1 antivirus for free.

Avast Free Antivirus protects your computer against viruses and malware, and it helps you protect your home network against intruders.

Block and remove spyware with Avast

Avast Free Antivirus includes anti-spyware protection to keep your personal information, banking details and online activity private.

Avast ransomware protection

Offering full malware protection, Avast Free Antivirus analyses unknown files to detect and block ransomware attacks before they affect you.

Real-time malware detection from Avast

Avast Free Antivirus works quietly in the background, analyzing unknown files and applications in real time, to block malware on your PC.

Powerful protection against WannaCry

Intelligent, real-time protection at no cost – Avast Free Antivirus helps you stay safe from nasty ransomware attacks like WannaCry.

Best free antivirus for Windows 10

Avast Free Antivirus is light, smart and powerful. Our world leading antivirus detects and stops all types of malware on your Windows 10 PC.

Best free antivirus for Windows 7

Avast Free Antivirus is light, smart and powerful. Our world leading antivirus detects and stops all types of malware on your Windows 7 PC.

Best free antivirus for Windows 8

Avast Free Antivirus is light, smart and powerful. Our world leading antivirus detects and stops all types of malware on your Windows 8 PC.

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Intelligent antivirus & anti-malware

Detects threats no one has even heard of yet. Incredibly fast and reliable.

Wi-Fi Inspector

This unique-to-Avast feature scans your network for potential security issues to help prevent attacks on your routers and network.

Browser cleanup

Removes annoying browser addons and restores your clean search browser.