Jeffrey K Trotter

Best Free Antivirus Software 2025. Avast free antivirus software detects, blocks, and removes all types of malware: These are the best free antivirus software programs for windows that protect against spyware, trojans, keyloggers, viruses, malicious urls, and more.

Many of these freebies outperform the antivirus built. We’ve tested dozens of free antivirus software and our highest ratings go to totalav, kaspersky, bitdefender, avast, avg, and mcafee.