Free antivirus is your first step to online freedom
We believe everyone has the right to be safe online, which is why we offer our award-winning free antivirus to millions of people around the world.
Get free antivirus that comes with advanced privacy and security tools
Avast Free Antivirus is more than just an antivirus — it also includes these specialist tools:
6 layers of security
Easy to install and use
Wi-Fi network security
Protection against ransomware attacks
Enjoy more storage space and a faster device
It’s so easy to install — switching to Avast takes seconds
Avast has over 435 million users worldwide
Get privacy and performance tips, straight from the experts
A computer virus is designed to infect programs & files with malicious code, changing how a computer operates and spreading across systems.
What is a VPN? What does it do? How does it work? And how can you use a VPN? Learn all about a VPN's definition and uses in our guide.
Wondering why your internet speed is slow? Learn how to improve your internet connection right now, whether you're on Wi-Fi or Ethernet.
We all have some concept of hacking - but do you really know what it is? Read our full hacking definition here.
Find out how to turn private browsing mode on and off. Learn what private browsing is, how private it is, and how to browse the web privately.
Cryptography is the process of encrypting and decrypting data. Learn how cryptography works and how cryptographic algorithms are used.
Keep your online life private by hiding apps on your Android phone. Learn how to hide apps on your phone with an easy step-by-step guide.
A security breach is any incident resulting in unauthorized access to data, apps, networks, or devices by bypassing their security mechanisms.
Mac users often feel protected by the security features in macOS, but Macs can get viruses. Find out why Mac viruses can still be a threat.
Keeping people safe & secure around the world
Using real-time intelligence from over 435 million Avast users, we prevent more than 66 million threats every day.