As Microsoft continues to evolve its operating system, many users are asking: Does Windows 11 need antivirus software? With improved built-in security features, is third-party protection still necessary?
In this guide, we’ll explore whether you really need antivirus on Windows 11, how Microsoft Defender compares to other options, and which antivirus software is best in 2025 based on performance, protection, and ease of use.
Does Windows 11 Have Built-In Antivirus?
Yes — Windows 11 includes Microsoft Defender Antivirus (formerly known as Windows Defender), which is built into the operating system and enabled by default.
Microsoft Defender provides:
- Real-time malware scanning
- Firewall protection
- Ransomware protection with controlled folder access
- Cloud-based protection for faster threat detection
- Automatic updates with Windows Update
This means every Windows 11 PC already comes with a baseline level of cybersecurity out of the box.
Is Microsoft Defender Enough in 2025?
Microsoft Defender has improved significantly in recent years. Independent lab tests by AV-TEST and AV-Comparatives show that it scores high in protection and usability. However, it still lacks advanced features offered by premium antivirus suites.
Pros of Microsoft Defender:
- Free and built-in
- Low system impact
- Decent real-time protection
- No annoying ads or popups
Cons of Microsoft Defender:
- No dedicated VPN
- No password manager
- Less effective phishing protection
- No identity theft monitoring
Conclusion: Microsoft Defender is suitable for casual users with safe browsing habits, but those who store sensitive data or want full-featured protection may benefit from a third-party antivirus.
Does Windows 11 Need Third-Party Antivirus?
Yes, for most users, third-party antivirus software is recommended.
Windows 11 users are exposed to increasingly sophisticated threats — including zero-day malware, phishing sites, rootkits, and ransomware. Advanced antivirus programs offer more robust defenses, including:
- Behavioral analysis for new threats
- VPN integration for secure browsing
- Webcam/mic protection
- Password managers
- Parental controls
- Dark web monitoring
So while Windows Defender is a solid foundation, a premium antivirus suite delivers much broader protection.
Which Antivirus Is Best for Windows 11 in 2025?
Here are the top antivirus solutions for Windows 11 users in 2025, based on independent lab tests, user reviews, and security features:
1. Bitdefender Total Security
Bitdefender is consistently ranked #1 for malware protection. It combines a minimal interface with powerful features like multi-layer ransomware protection, a secure VPN, and performance optimization tools.
- AI-based threat detection
- Advanced firewall & anti-tracker
- One-click system scans
- Device optimization tools
2. Norton 360 Deluxe
Norton remains a cybersecurity powerhouse in 2025. It includes real-time protection, cloud backup, parental controls, and identity theft monitoring via LifeLock (US only).
- Secure VPN included
- Dark web monitoring
- Firewall + webcam protection
- Up to 5 devices
3. Kaspersky Premium
Despite past controversies, Kaspersky offers strong protection, light system impact, and exceptional anti-phishing performance. It’s GDPR-compliant and audited by third parties.
- Secure money browser
- High malware detection scores
- Password vault + file encryption
- Customizable scans
4. McAfee Total Protection
McAfee has rebranded and improved its software significantly. It now offers identity protection, encrypted storage, and fast cloud-based scanning.
- Cross-device support (Windows, macOS, Android)
- VPN + file shredder
- Excellent phishing protection
5. Avast One / AVG Ultimate
Owned by the same parent company, Avast and AVG offer free and paid versions. Their premium plans offer AI-based malware detection, webcam shields, and real-time browser defense.
- Free version available
- AI engine for threat detection
- Web & email protection
What About Free Antivirus Options?
If you’re on a budget, these are the top free antivirus options for Windows 11 in 2025:
- Microsoft Defender – Best baseline protection
- Bitdefender Antivirus Free – Lightweight and effective
- AVG Free – Strong malware and phishing defense
- Avast Free Antivirus – Includes Wi-Fi and browser scanning
Free versions work for light users, but paid versions offer more complete protection.
Best Practices for Antivirus on Windows 11
- Keep antivirus software updated — New threats appear daily
- Enable real-time scanning and cloud-based protection
- Use secure browsers and ad blockers
- Backup important files regularly
- Use a password manager and 2FA
Final Verdict: Does Windows 11 Need Antivirus?
Yes, Windows 11 needs antivirus software — even though it has built-in protection. Microsoft Defender is a good starting point, but most users benefit from the extra security and features that come with premium antivirus solutions.
Cyber threats in 2025 are increasingly complex, targeting both individuals and businesses. Whether you choose Bitdefender, Norton, or Kaspersky, investing in trusted antivirus software ensures your Windows 11 system stays protected and optimized.
Which Antivirus Is Best in 2025?
- Best Overall: Bitdefender Total Security
- Best for Families: Norton 360 Deluxe
- Best Value: Kaspersky Premium
- Best Free Option: Microsoft Defender or AVG Free
- Most User-Friendly: Avast One
Secure your PC today and browse with confidence.
