: Some free providers have historically sold user browsing data; while many state they have stopped, built-in options like Microsoft Defender offer higher privacy by default.
Based on 2026 testing from independent labs like AV-TEST and expert evaluations from PCMag and CNET, here are the top recommendations:
: An excellent all-rounder that shares the same powerful engine as Avast. It stands out for its high online detection rates (98.9% in 2025 testing) and includes a specialized secure browser. Best Free Anti Virus Software
While free software provides excellent protection against known malware, there are key trade-offs:
: Rated as the Best Overall for its "set-it-and-forget-it" approach. It uses the same high-end engine as Bitdefender’s paid versions, offering excellent real-time threat detection and a very low impact on system performance. : Some free providers have historically sold user
: Expect frequent "nag" screens encouraging you to upgrade to a premium version.
: Ideal for users who want extra tools in one package, such as a basic password manager and a software updater, though it can be more demanding on CPU resources during deep scans. : Ideal for users who want extra tools
For users in 2026, the best free antivirus is often the one already installed on your system. (for Windows) and XProtect (for macOS) have evolved into robust, high-performing security solutions that require no extra setup. However, third-party options remain vital for users on older operating systems or those seeking extra features like VPNs or more granular scan scheduling. Top Free Antivirus Software of 2026