Head-to-head
Microsoft Defender vs Bitdefender
The question behind every antivirus purchase in 2026: is the free protection already inside Windows enough, or is a paid suite worth it?
Free start
Microsoft DefenderMicrosoft
Microsoft Defender
Already on your PC, and better than its reputation.
Full protection
Bitdefender Total SecurityBitdefender
Bitdefender Total Security
Lab-test royalty that stays out of your way.
Microsoft DefenderBitdefender Total Security
Our score4.2 / 54.7 / 5
PriceFreeFrom $4.17/mo
Free planNo
Best forCareful single-PC usersMost people, most devices
CategoryFree & built-inComplete suites
ProviderMicrosoftBitdefender
Our verdict
For a careful user with one updated Windows PC, Microsoft Defender genuinely suffices: it scored 6/6 for protection in recent AV-TEST rounds and costs nothing. Bitdefender earns its price the moment your situation gets more complicated: multiple devices and platforms, kids on the network, weaker browsing habits, or the need for a VPN, password manager, and anti-phishing that works outside Edge. Free covers the engine; paid covers the household. Be honest about which one you are.
“The free baseline that made half the paid market nervous. A perfect 6/6 protection score in recent AV-TEST rounds, zero nags, zero installs. It lacks a VPN, password manager, and cross-platform coverage, but for a careful single-PC user, Defender plus good habits is a legitimate choice.”Editorial team, on Microsoft Defender
“The best mix of protection, speed, and price in this lineup. Top marks at AV-Comparatives and AV-TEST again in 2026, noticeably light on system resources, and the suite features feel useful rather than bolted on. Watch the renewal price, like everywhere in this market.”Editorial team, on Bitdefender Total Security