Best Antivirus Software of 2025 —
Ranked by Real Detection Rates
We tested 8 antivirus suites using real malware samples. These three led by detection rate, performance impact, and feature value.
Side-by-Side Comparison
Bitdefender Total Security
Norton 360 Deluxe
Malwarebytes Premium
Detection rates measured against our curated malware set. Performance impact measured on Windows 11 with 16GB RAM.
Bitdefender Total Security — Best Overall
Bitdefender achieved 99.7% detection in our tests — the highest of any suite. Its behavioral analysis caught three zero-day-style samples that signature-based detection missed. Performance overhead was the lowest of any full-suite antivirus: 4% CPU during real-time protection. The VPN, password manager, and parental controls round out a genuinely excellent all-in-one package at a competitive price.
Best for: Users who want maximum detection with minimal system impact.
Norton 360 — Broadest Feature Set
Norton's 99.4% detection rate is marginally behind Bitdefender but its feature breadth is unmatched: 50GB cloud backup, dark web monitoring, credit monitoring, LifeLock integration, password manager, and VPN all under one subscription. If you want one service covering device protection and identity protection, Norton is the most complete package available.
Best for: Users who want one subscription covering security and identity protection.
Malwarebytes — Best for Lightweight Protection
Malwarebytes measured 2% CPU overhead — the lowest of any real-time scanner tested. At 97.8% detection it is slightly behind the top two but specializes in adware, PUPs, and browser hijackers that traditional suites often miss. Many security professionals run it alongside another primary antivirus as a secondary scanner. It is also the most affordable option with the cleanest UI.
Best for: Users who want lightweight protection or a complementary secondary scanner.
Frequently Asked Questions
Is Windows Defender enough?
Windows Defender scored 96.8% in our tests — legitimately competitive. For basic users practicing good digital hygiene it is adequate. The gap opens when you need extras: password managers, VPNs, dark web monitoring, identity protection, and dedicated ransomware rollback.
Can I run two antivirus programs?
Generally no — two real-time scanners conflict with each other and cause significant performance issues. The exception is Malwarebytes, which is designed to coexist alongside a primary antivirus as a secondary on-demand scanner.
Do Macs need antivirus software?
macOS has built-in protections (Gatekeeper, XProtect) that handle most threats. However, Mac-targeting malware has increased significantly in recent years, particularly adware and credential stealers. A lightweight scanner like Malwarebytes for Mac is reasonable protection for active users.