Need to protect your PC with Windows?

avast! is the most-trusted antivirus brand globally. We protect over 200 million PCs, Macs, and Android devices - more than any other brand. Download your avast! today.

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Which level of protection suits you best?


avast! Free Antivirus


avast! Internet Security


avast! Premier

Download Free Antivirus if you want just essential protection. But if you want security against threats such as money fraud or targeted hacker attacks, try Internet Security or Premier.

avast! Free Antivirus avast! Internet Security avast! Premier
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Free 30-day trial


Free 30-day trial

Intelligent Antivirus with new DynaGen technology yes yes yes
Anti-malware Protection plus anti-spyware & anti-rootkit yes yes yes
SafeZone for secured payments & banking   no yes
Silent Firewall against hacker attacks   no yes
Anti-spam against phishing & scam emails   no yes
Automatic Software Updater keeps other programs updated     yes
AccessAnywhere access your PC over the Internet     yes
Data Shredder for a military-grade permanent data erasure     yes
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Free 30-day trial

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Free 30-day trial

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The most popular antivirus family!

Millions and millions of desktop and mobile devices protected

Now that we protect around 200 million active devices on all inhabited continents, we are thinking of how to expand to Antarctica. Negotiations with local penguins are underway.

Quarter century of computer-security making

In 2013, avast! celebrates 25 years! In all that we do, we’re committed to the trust and satisfaction of our customers. And our customers’ loyalty gives us great motivation to innovate and drive security further. Should avast! ever not meet your expectations, remember that all our products come with a 30-day, no-question, money-back guarantee.

Experts frequently certify and award us

We hate bragging, but we can see you insist! We get awarded and certified often, by numerous independent, industry-related organizations and testing agencies. They praise us for the virus detection capabilities of our software, as well as for not slowing down your PC.