Windows 11 includes built-in security, but some users prefer an additional antivirus with extra scanning, web protection, or a simpler dashboard. This guide compares four legitimate free options and links only to their official websites.
Quick recommendations
- Best for most people: Microsoft Defender — already built into Windows 11.
- Best lightweight alternative: Bitdefender Antivirus Free.
- Best for extra scan options: Avast Free Antivirus.
- Best simple alternative: AVG AntiVirus Free.
1. Microsoft Defender — best built-in choice
Microsoft Defender Antivirus works through the Windows Security app included with Windows 11. It provides real-time malware protection and works with Windows Update, so there is usually nothing extra to download. For many home users who keep Windows and their browser updated, it is the simplest starting point.
Best for: Users who want automatic protection without installing another security suite.
Read Microsoft’s official Defender guide
2. Bitdefender Antivirus Free — lightweight protection
Bitdefender offers a permanent free antivirus product for Windows 10 and Windows 11. Its official page highlights real-time protection against malware, infected downloads, phishing attempts, ransomware, and emerging threats. The free edition focuses on essential protection and is designed to use few system resources.
Best for: People who want a focused third-party antivirus with a clean setup.
Download Bitdefender Antivirus Free from the official website
3. Avast Free Antivirus — useful scanning tools
Avast Free Antivirus includes smart, full, and targeted scans. Avast says its free protection helps defend against viruses, malware, phishing, and other threats. Some additional features may require a paid upgrade, so read each installation screen carefully and choose only the components you need.
Best for: Users who want several scan types and an easy-to-use interface.
Download Avast Free Antivirus from the official website
4. AVG AntiVirus Free — straightforward free security
AVG AntiVirus Free provides real-time scanning for viruses, suspicious files, unsafe downloads, scam websites, and email-based threats. The official product supports Windows 11 and offers a guided installation process. Paid features are optional and are not required for basic free protection.
Best for: People who want familiar controls and automatic background scanning.
Download AVG AntiVirus Free from the official website
Do you need a separate antivirus on Windows 11?
Not everyone needs an extra antivirus. Microsoft Defender is already built into Windows 11 and is a practical choice for many users. A third-party option may be useful if you prefer its interface or features. Do not run two real-time antivirus products at the same time because they can conflict and slow down your PC.
Safe installation checklist
- Download antivirus software only from the developer’s official website.
- Keep Windows, browsers, and applications updated.
- Never disable security tools to run a crack, key generator, or unknown installer.
- Use a unique password and two-factor authentication for important accounts.
- Back up important files regularly.
Final verdict
Microsoft Defender is the easiest free choice for most Windows 11 users because it is already installed. Bitdefender Free is a strong lightweight alternative, while Avast and AVG are suitable for users who prefer their interfaces and scan options. Choose one real-time antivirus, keep it updated, and combine it with safe browsing habits.
Disclosure: Product features can change. Verify current requirements and features on the official download page before installing. Softvexo does not host antivirus installers.