Bitdefender vs Microsoft Defender
Bitdefender leads Microsoft Defender by 0.6 points overall (8.7 vs 8.1).
8.7/10, Excellent
8.1/10, Very good
Criterion by criterion
Where each one wins
Bitdefender9.5
Regularly among the top scorers in AV-TEST and AV-Comparatives reports.
Protection record
35% weight
Microsoft Defender8.5
Tested in AV-TEST and AV-Comparatives series with generally good results.
Bitdefender8.5
Lab reports typically show low system impact.
System impact
15% weight
Microsoft Defender7.0
Lab reports have shown more slowdown in some tasks than the lightest rivals.
Bitdefender8.0
Free Windows edition and strong first-year pricing; renewals rise.
Value for money
20% weight
Microsoft Defender10.0
No extra cost on Windows.
Bitdefender8.5
Suites add web protection, firewall, a limited VPN and parental controls.
Extra features
15% weight
Microsoft Defender5.5
Core protection and firewall; few consumer extras.
Bitdefender8.0
Clean apps on all major platforms with an autopilot mode.
Ease of use & platforms
15% weight
Microsoft Defender8.0
On by default with nothing to install, but Windows only.
Published facts
Side by side
| Fact | Bitdefender | Microsoft Defender |
|---|---|---|
| Free version | Yes | Yes |
| Money-back window | Not published | Not published |
| Free trial | Free trial of paid suites | Not published |
| In AV-TEST or AV-Comparatives tests | Yes | Yes |
| Main platforms | Windows, macOS, Android, iOS | Windows (built in) |
| Company base | Romania | United States |
Verdict
Which should you pick?
Choose Bitdefender if…
You want something best for people who want top-tier protection with low fuss.
- + Consistently strong lab results
- + Free edition for Windows
- + Low system impact
Choose Microsoft Defender if…
You want something best for windows users who want solid no-cost protection.
- + No extra cost
- + Enabled by default
- + Tested by major independent labs
Checked 1 Nov 2026.
Questions
Bitdefender vs Microsoft Defender: quick answers
Is Bitdefender better than Microsoft Defender?
Bitdefender leads Microsoft Defender by 0.6 points overall (8.7 vs 8.1). Bitdefender scores higher on protection record, system impact, extra features. Microsoft Defender scores higher on value for money.
Who should choose Microsoft Defender over Bitdefender?
Microsoft Defender is best for windows users who want solid no-cost protection. Bitdefender is best for people who want top-tier protection with low fuss.
How were Bitdefender and Microsoft Defender scored?
Both were scored on the same 5 weighted criteria for antivirus software, using public information such as published plans and terms. We do not lab-test products.