ZoneAlarm Free Firewall blocks hackers from infiltrating your home PC by hiding your computer from unsolicited network traffic. By detecting and preventing intrusions, ZoneAlarm Free Firewall keeps your PC free from viruses that slow down performance, and spyware that steals your personal information, passwords, and financial data.

Essential firewall protection
Be invisible to others online
New interface makes it even easier—smaller size keeps it light
Systematically identifies hackers and blocks access attempts