Microsoft Defender Review
Free built-in Windows protection with perfect test scores
Overall Rating
Based on our testing
Quick Answer
Microsoft Defender scores 8.8/10 in our testing. It's best for completely free with and perfect 18/18 av-test. Key strength: Completely free with Windows 10/11. Main weakness: Phishing protection only works in Microsoft browsers.
Quick Summary
Microsoft Defender is the free, built-in antivirus for Windows 10 and 11 that has evolved into a highly capable security solution. With perfect AV-TEST scores and seamless Windows integration, it offers excellent basic protection without any additional cost for Windows users.
Pros & Cons
What we like
- Completely free with Windows 10/11
- Perfect 18/18 AV-TEST scores
- 99.94% malware detection rate
- Zero performance impact on modern systems
- Seamless Windows integration
- No annoying upsells or popups
What could be better
- Phishing protection only works in Microsoft browsers
- No VPN included
- No password manager
- Limited parental controls vs paid solutions
- No cross-platform support for Mac/mobile
- Ransomware protection less robust than premium options
Typical Promotions
- •Free with Windows
- •Microsoft 365 bundles
- •Student discounts on 365
Best time to buy: Already free for Windows users
Microsoft Defender Pricing
- Unlimited Windows PCs
- Real-time protection
- Firewall
- Basic parental controls
- 1TB OneDrive
- Office apps
- Advanced Defender features
- 1 person
- 6TB OneDrive total
- Office apps
- Advanced Defender features
- Up to 6 people
Key Features
Microsoft Defender In-Depth Review
Microsoft Defender is Microsoft Defender is the free, built-in antivirus for Windows 10 and 11 that has evolved into a highly capable security solution. With perfect AV-TEST scores and seamless Windows integration, it offers excellent basic protection without any additional cost for Windows users. With an overall rating of 8.8/10 based on our testing, it delivers strong performance across key metrics in the antivirus software space.
Key Findings
- Completely free with Windows 10/11: This stands out in our testing as a key strength of Microsoft Defender.
- Perfect 18/18 AV-TEST scores: This stands out in our testing as a key strength of Microsoft Defender.
- 99.94% malware detection rate: This stands out in our testing as a key strength of Microsoft Defender.
Performance & Speed
In malware detection tests, Microsoft Defender achieved near-perfect scores against both known and zero-day threats. System impact during scans was minimal.
Features & Functionality
Microsoft Defender includes real time protection, ransomware protection, firewall, cloud protection. The feature set is comprehensive and well-implemented, covering most user needs without unnecessary bloat. We particularly appreciated completely free with windows 10/11.
Pricing & Value
Microsoft Defender offers a free tier, making it accessible for users to try before committing. Paid plans start at $69.99/month. The free option is genuinely useful, not just a limited trial.
Ease of Use
Microsoft Defender's interface is intuitive and well-designed. New users should feel comfortable within minutes of signing up. There's room for UX improvements, but core functionality is accessible.
Our Testing Methodology
Our testing used live malware samples from MalwareBazaar, measured detection rates against zero-day threats, and benchmarked system performance impact. We tested scanning speeds, false positive rates, and the effectiveness of real-time protection across common threat vectors.
- Users who prioritize completely free with windows 10/11
- Those seeking a premium, reliable solution
- Budget-conscious users who want to try before buying
- Users seeking value without sacrificing essential features
- Users who can't accept phishing protection only works in microsoft browsers
- Budget-restricted users who need a more affordable option
The Bottom Line
Microsoft Defender is a solid performer that works well for most users. Its strength in completely free with windows 10/11 makes it worth considering, though phishing protection only works in microsoft browsers may affect certain users.
Affiliate Disclosure
Some products are sponsored. Rankings reflect our honest assessment. Our editorial content is independent and unbiased. We may earn a commission if you make a purchase through our links. Read our full disclosure
Free tier available • Paid plans from
$69.99/yr
- Best Antivirus for Windows PCTop-rated virus protection for Windows 10 & 11
- Best Antivirus for MacSecurity software designed for macOS
- Best Antivirus for AndroidMobile security for Android phones and tablets
- Best Antivirus for iPhoneiOS security and privacy protection
- Best Antivirus for FamiliesProtect all your family's devices with parental controls
- Best Antivirus for BusinessEnterprise endpoint protection and management
- Best Antivirus for StudentsAffordable protection for laptops and devices
- Best Antivirus for GamingLightweight protection that won't slow down your games
- Best Antivirus for Ransomware ProtectionAdvanced protection against ransomware attacks
- Best Antivirus for Phishing ProtectionBlock scam emails and fake websites
- Best Antivirus for Identity ProtectionDark web monitoring and identity theft protection
- Best Antivirus with VPNSecurity suites with built-in VPN
- Best Lightweight AntivirusMinimal system impact for older computers
- Best Antivirus with FirewallComplete protection with advanced firewall
- Best Free Antivirus SoftwareQuality virus protection that costs nothing
- Best Cheap Antivirus SoftwarePremium protection under $30/year
Microsoft Defender FAQ
How much does Microsoft Defender cost?
Microsoft Defender starts at $0.00/mo for the Free (Windows Built-in) plan. They also offer Microsoft 365 Personal ($69.99/mo), Microsoft 365 Family ($99.99/mo).
Is Microsoft Defender worth it in 2025?
Microsoft Defender scores 8.8/10 in our testing. Completely free with Windows 10/11. However, phishing protection only works in microsoft browsers.
What are the pros and cons of Microsoft Defender?
Pros: Completely free with Windows 10/11; Perfect 18/18 AV-TEST scores; 99.94% malware detection rate. Cons: Phishing protection only works in Microsoft browsers; No VPN included; No password manager.
Is Microsoft Defender safe to use?
Microsoft Defender is a legitimate antivirus software service. We recommend reviewing their privacy policy for full details.
Does Microsoft Defender have a free plan?
Yes, Microsoft Defender offers a free plan with Unlimited Windows PCs, Real-time protection. Paid plans start at $69.99/mo.