I need a free option that's actually safe

Free antivirus is a real product category, not a stripped-down version of paid software. The trade-off is always somewhere — in features, in platform coverage, in data collection practices, or in an interface that pushes you toward a paid tier every time you open it. The question isn't whether free protection is legitimate. It's which trade-off you're actually comfortable with.

Quick answer

Want free real-time protection on Windows→Bitdefender Free — real-time protection with no daily cap, no configuration required; Windows only, no firewall or extras

Machine is showing symptoms or you want a cleanup scan→Malwarebytes Free — on-demand scanner, widely used for first-response cleanup; no real-time protection in free tier

Already on Windows, careful user, no additional install→Windows Defender — built in and always active; coverage is adequate for disciplined users who keep the OS updated

When it matters

The free options that matter are built on genuinely different assumptions about what 'free' means:

Bitdefender Free delivers real-time protection — continuous background scanning — at no cost on Windows; this is uncommon; most genuinely free tiers restrict you to on-demand scanning only
Malwarebytes Free is an on-demand scanner with no real-time component; you run it when something feels wrong, or periodically as a second-opinion check alongside another tool
Windows Defender is already running if you haven't installed anything else; detection rates have improved significantly and it's a legitimate baseline for lower-risk users
Using Bitdefender Free for background protection and Malwarebytes Free for periodic cleanup is a functional combination at zero cost

Free options are Windows-first. If your household includes macOS, Android, or iOS devices, cross-platform coverage at no cost doesn't exist at a meaningful quality level — that requires a paid plan.

When it fails

Ransomware file rollback — automatic recovery of encrypted files is a paid feature across every product in this category, without exception
Real-time protection in Malwarebytes Free — the free version scans when you run it; active threats that execute between scans are not intercepted
Cross-device coverage — free tiers are single-device; household or multi-device coverage requires a paid subscription
Dark web monitoring, identity alerts, and parental controls — none of these are available in any free tier

Free protection handles the core malware detection layer. It doesn't protect against the consequences of an attack that completes — files already encrypted, credentials already exfiltrated, accounts already accessed. Those outcomes require either the paid features that prevent them or separate identity monitoring services.

How providers fit

Bitdefender Free fits if you want ongoing real-time background protection on Windows at no cost. The free tier includes the core scanning engine with no daily cap and no configuration overhead — it runs quietly and requires no setup decisions. No firewall, no VPN, no parental controls. Windows only. Built on the same detection engine that regularly earns top AV-TEST protection scores in the paid product.

Malwarebytes Free fits as a cleanup and verification tool — not as a real-time protection layer. Run it when something feels off, when you've installed software from an unfamiliar source, or as a periodic check alongside Bitdefender Free or Windows Defender. Its strength is specifically in finding PUP, adware, and stubborn malware that general-purpose scanners miss.

Bottom line

Bitdefender Free for continuous background protection on Windows. Malwarebytes Free as a cleanup and second-opinion tool. Both together if you want to cover both roles at zero cost. Windows Defender as the always-available fallback that's already running if you haven't installed anything — adequate for careful users, genuinely below Bitdefender Free for higher-risk ones.

Quick decision: I need something free that actually works→My device might already be infected→I just want simple protection that works→