Protecting your computer doesn’t have to mean paying for another subscription. Several free antivirus programs offer useful protection against malicious software, and Windows already includes an option worth considering. The challenge is choosing one that suits your needs without filling your computer with features you’ll never use.
There is no single antivirus program that is best for everyone. Protection, ease of use, performance, and the features included for free all matter. This guide focuses on Windows PCs, with five options to consider in 2026.
What does antivirus software actually do?
Modern antivirus software tackles more than traditional computer viruses. It can detect and block several kinds of malicious software, collectively called malware, including spyware that steals information and ransomware that locks files and demands payment.
Many products also check for suspicious behavior and dangerous websites. However, features vary between free and paid editions, so a product’s advertising may describe tools that aren’t included in its free version. Avast, for example, now offers its free antivirus through the Avast One app, with additional features available through paid upgrades.
Understanding the different types of scans
You don’t need to become a computer expert to use antivirus software, but these terms are worth knowing:
Real-time protection: Checks files and activity as you use your computer, helping stop threats before they cause damage.
Quick scan: Examines locations where malware commonly hides.
Full scan: Checks much more of your computer and usually takes longer.
Custom scan: Lets you check a particular file, folder, or drive.
Scheduled scan: Runs automatically at a chosen time, where supported.
A quick scan is useful for routine checks, while a more thorough scan may help if you still suspect something is wrong. Microsoft also allows you to scan individual files and folders directly from File Explorer.
1. Microsoft Defender Antivirus
A practical starting point for people who want minimal setup
Before downloading anything, check the protection already on your PC. Microsoft Defender Antivirus is built into Windows and managed through the Windows Security app. It provides ongoing malware protection without requiring a separate antivirus purchase.
It also deserves consideration on performance rather than convenience alone. In AV-TEST’s May–June 2026 evaluation, Microsoft Defender earned 6 out of 6 for protection, 5.5 for performance, and 6 for usability. Those results support treating it as a serious option for home users.
Advantages:
Built into Windows, so there is no separate download.
Provides real-time malware protection.
Offers straightforward access to security settings.
Things to consider:
Its controls sit within Windows settings rather than a separate security suite.
The built-in antivirus is different from the Microsoft Defender app offered with certain Microsoft 365 subscriptions.
How to find it: Open the Start menu, type Windows Security, and select Virus & threat protection.
Here's a simple video explaining how to download and install it.
2. Bitdefender Antivirus Free
Worth considering if you prefer a focused antivirus program
Bitdefender Antivirus Free is aimed at Windows users who want protection without a large collection of extra utilities. Its free edition includes real-time threat detection and protection against threats such as infected downloads and malicious websites.
The appeal is simplicity: it concentrates on protecting your computer rather than presenting you with an extensive toolbox. You will need to create a Bitdefender Central account during setup.
Advantages:
Ongoing free protection rather than a short trial.
Real-time monitoring for malicious activity.
Includes defenses against phishing and dangerous websites.
Things to consider:
Requires an account.
This particular free antivirus product is for Windows.
It does not include the full feature set of Bitdefender’s paid packages.
Download: Bitdefender Antivirus Free.
3. Avast One With Free Antivirus
An option for people who want additional help spotting online scams
If you remember Avast Free Antivirus, the name and presentation have changed: Avast now provides its free antivirus through Avast One.
Alongside malware protection, the free offering includes tools to help identify dangerous websites and suspicious online messages. Its Avast Assistant can provide guidance about a questionable message or offer, although that guidance should never replace independently checking an unexpected request for money or personal information.
Advantages:
Real-time antivirus protection.
Tools to help identify unsafe websites and downloads.
Network inspection features and scam guidance.
Things to consider:
Some features require paid upgrades.
Check whether an extra is genuinely free or only available as a trial.
A broader collection of tools may feel unnecessary if you only want antivirus protection.
Download: Avast’s official free antivirus page.
4. AVG AntiVirus Free
Another option for everyday browsing and email protection
AVG AntiVirus Free combines malware protection with defenses against dangerous downloads, suspicious websites, and infected emails. It also monitors software behavior for signs that a program may be doing something harmful.
Advantages:
Real-time protection against malware.
Checks for suspicious files and software behavior.
Includes protection against unsafe websites and downloads.
Things to consider:
The free edition is intended for personal and family use, not commercial use.
Check the free edition’s features before assuming it includes everything advertised for AVG’s paid products.
Download: AVG AntiVirus Free.
AVG and Avast are less different under the surface than their branding suggests: AV-Comparatives identifies AVG as using the Avast engine. Choose between them based on the interface and features you prefer; there is little reason to install both.
5. Avira Free Security
An option for people interested in extra privacy tools
Avira Free Security packages antivirus protection with additional tools, including a password manager, a browser safety extension, and a limited VPN.
A VPN encrypts traffic between your device and the VPN service, but Avira’s free allowance is 500 MB per month. That makes it suitable for occasional use rather than regular video streaming or extensive browsing.
Advantages:
Combines antivirus protection with additional privacy tools.
Includes a password manager.
Offers a browser extension with phishing protection.
Things to consider:
The free VPN has a small monthly data allowance.
Extra tools add complexity if you only want antivirus protection.
Some functions require an upgrade to a paid package.
Download: Avira Free Security.
What do independent tests tell us?
Independent testing provides a useful check on manufacturers’ promises. In AV-TEST’s May–June 2026 Windows evaluation, Avast Free Antivirus and AVG AntiVirus Free each earned the maximum 18 points across protection, performance, and usability.
However, pay attention to the exact product tested. That evaluation assessed Bitdefender Total Security and Avira Internet Security, rather than their free editions. A strong result for a paid suite should not automatically be presented as a test result for its free counterpart. No test result guarantees protection against every future threat.
One important check before you install anything
Make sure Windows itself is receiving security updates. Standard Windows 10 support ended on October 14, 2025. If you still use Windows 10, check your eligibility and enrollment in Microsoft’s Extended Security Updates program, or move to a supported system. Antivirus software cannot replace operating-system security fixes.
For someone who wants the simplest starting point, Microsoft Defender is worth checking before adding another program. Bitdefender offers a focused alternative, while Avast, AVG, and Avira provide different combinations of additional tools. Choose according to the features you will actually use, and download only from the official links above.
