Best Free Antivirus Software in 2025, Confirmed 100% Malware Detection Rate

Our top pick is TotalAV since its free version provides excellent malware detection, data breach scanning, support for multiple platforms, and even a system tune-up tool.

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By Aliza Vigderman Aliza Vigderman, Senior Editor, Industry Analyst & Gabe Turner Gabe Turner, Chief Editor
Best Free Antivirus Software in 2025, Confirmed 100% Malware Detection Rate
Read about our Methodology and Testing
Our malware specialists tested 40+ antiviruses for over 1,500 hours on Windows, macOS, iOS, and Android. We tested both their free and paid versions, giving us a clue on the limitations of using the free version as primary antivirus software. We also paid close attention to key aspects such as malware detection rate and device compatibility. For more information about how we tested our antiviruses, see our complete testing methodology.
1,500+ research hours
40+ antivirus tested
200+ malware removed
20+ hours of total scan time
5 antivirus recommended
All of our content is written by humans, not robots. Learn More