Keeping your PC safe from viruses and malware is essential for smooth performance and online security. Fortunately, there are many free antivirus programs compatible with Windows 11 that provide advanced protection — including USB protection, ransomware defense, trojan blocking, and password security.
In this article, we’ll explore the best free antivirus software for Windows 11, their key features, and provide official download links for each.
🧩 1. Windows Defender (Microsoft Defender Antivirus)
Windows Defender, now known as Microsoft Defender Antivirus, is built into Windows 11 and offers excellent real-time protection — no installation required.
Key Features:
- ✅ Real-time virus and malware protection
- ✅ Automatic USB and external drive scanning
- ✅ Ransomware protection via “Controlled Folder Access”
- ✅ Cloud-based updates for new threats
- ✅ Integrated password and privacy monitoring via Microsoft account
Download Link: (Pre-installed with Windows 11)
🔗 Visit Microsoft Security Page
💡 Tip: If your PC runs slow or shows malware signs, try entering Safe Mode in Windows 11 to perform a deeper virus scan.
🧩 2. Avast Free Antivirus
Avast Free Antivirus is one of the most trusted antivirus programs worldwide. It’s lightweight, powerful, and offers strong protection against new and existing threats.
Key Features:
- 🧠 Smart scanning for malware, trojans, and spyware
- 🔒 Ransomware protection for your files
- 🔌 USB and removable drive protection
- 🔐 Password Manager to store logins securely
- 🌐 Web and email shield for online safety
Official Download:
🔗 Download Avast Free Antivirus
🧩 3. AVG AntiVirus Free
Owned by Avast, AVG Free Antivirus provides robust protection and an easy-to-use interface. It’s designed for users who prefer simplicity and reliability.
Key Features:
- 🛡️ Real-time virus and trojan detection
- 💾 USB scanning and protection
- 🔐 Advanced ransomware defense
- 🧩 Automatic updates to stay ahead of threats
- ⚡ Lightweight and resource-friendly
Official Download:
🔗 Download AVG Free Antivirus
👉 Check whether your system meets the requirements for antivirus software with our guide on Minimum System Requirements for Installing Windows 11.
🧩 4. Bitdefender Antivirus Free Edition
Bitdefender Free Edition delivers powerful real-time protection using one of the industry’s top-rated malware engines. It’s minimal, automated, and ideal for users who prefer silent protection.
Key Features:
- 🚫 Real-time virus and ransomware defense
- 💽 USB auto-scan and background protection
- 🧠 Behavioral detection to stop trojans
- 🔒 Web attack prevention and anti-phishing
- 🧩 Low system impact
Official Download:
🔗 Download Bitdefender Free Edition
🧩 5. Kaspersky Security Cloud Free
Kaspersky Free Antivirus provides dependable protection with real-time scanning and secure password management. Its cloud-based threat detection ensures you’re always protected.
Key Features:
- ☁️ Cloud-based malware and trojan protection
- 🔒 Ransomware and spyware defense
- 💾 USB and external device scanning
- 🧠 Limited Password Manager included
- 📊 Security reports and activity monitoring
Official Download:
🔗 Download Kaspersky Free Antivirus
🧩 6. Avira Free Security
Avira Free Security Suite combines antivirus, VPN, and system optimization tools into one simple package — making it a great all-rounder for Windows 11 users.
Key Features:
- 🛡️ Protection against viruses, trojans, and ransomware
- 🔌 USB and external device scanning
- 🔐 Password Manager + free VPN
- 💻 System speed-up utilities
- 🚀 Lightweight and automatic updates
Official Download:
🔗 Download Avira Free Security
🔒 Why You Need Antivirus Software on Windows 11
Even though Windows 11 comes with built-in protection, adding a third-party antivirus enhances your security — especially against ransomware, phishing, and trojan horse attacks.
Running periodic scans and keeping definitions up to date can prevent unauthorized access and data theft.
If your Windows search bar stops working after malware removal, see our guide on Windows 11 Search Bar Not Working – Quick Fixes.
🧠 FAQ – Free Antivirus for Windows 11
1. Does Windows 11 need antivirus software?
Windows 11 already includes Microsoft Defender Antivirus, which offers good protection. However, installing a free antivirus like Avast, AVG, or Bitdefender can provide extra security features such as ransomware and USB protection.
2. What is the best free antivirus for Windows 11?
Some of the best free antiviruses for Windows 11 are Avast Free Antivirus, Bitdefender Free Edition, AVG Free, and Kaspersky Security Cloud Free. Each offers virus, ransomware, and trojan protection.
3. Is Windows Defender enough for Windows 11?
Yes, Microsoft Defender provides solid protection for most users. However, advanced users who need password management, VPN, or extra privacy tools can consider third-party free antiviruses like Avira or Kaspersky.
4. Can free antivirus remove ransomware and trojans?
Yes, most modern free antiviruses like Bitdefender and Avast can detect and remove ransomware, trojans, and spyware through real-time protection and behavior analysis.
5. Which antivirus offers USB protection in Windows 11?
Antiviruses like Avast, AVG, Bitdefender, and Kaspersky automatically scan USB drives to prevent malware infection and block autorun viruses.
✅ Conclusion
Choosing the right free antivirus depends on your needs:
- For default system protection, use Windows Defender.
- For extra tools and password management, try Avast or Avira.
- For silent but powerful protection, choose Bitdefender Free Edition.
Whichever you pick, make sure it stays updated and perform regular scans to keep your Windows 11 PC safe and secure.