Best Free Antivirus Software for Windows (2026)
Back in 2006 a geek friend, scared by the Kamasutra and Leap-A virus outbreaks, called me because his Norton subscription had expired and he didn’t want to pay a yearly fee. So I went looking for the best free antivirus software and was surprised by the range available. This 2026 update lists the free options worth using today.
Quick answer: On Windows 10 and 11, the built-in Microsoft Defender Antivirus already gives solid free protection, so many people need nothing else. If you want a separate free antivirus, Bitdefender Antivirus Free, Avast Free Antivirus, AVG AntiVirus Free and Avira Free Security are the well-known choices. Only download them from the official websites.
Table of Contents
Best free antivirus software for Windows
- Microsoft Defender Antivirus: built into Windows 10 and 11, updated through Windows Update and turned on by default when no other antivirus is installed. Find it in the Windows Security app.
- Bitdefender Antivirus Free: a lightweight free scanner from a major security company with few settings to manage.
- Avast Free Antivirus: one of my two picks back in 2006 (then called Avast Home Edition), and still offered free for home use.
- AVG AntiVirus Free: the other 2006 favourite (then AVG Free from Grisoft). AVG and Avast are now part of the same company.
- Avira Free Security: the successor to AntiVir Personal Edition, which I also mentioned in the original post.
Free versions usually show prompts to upgrade to paid plans. That’s the trade-off for free protection; decline extras you don’t need during installation.
Do you still need a free antivirus in 2026?
For most home users on an up-to-date Windows PC, Microsoft Defender is enough when combined with safe habits. A third-party free antivirus can make sense if you prefer its interface or extra features. Don’t run two real-time antivirus programs at once, as they can conflict and slow your PC.
Paid suites such as Norton add features like a VPN, password manager and identity monitoring. If you’re curious, see our guides to the Norton Antivirus free trial and updating Norton for free.
How to stay safe beyond antivirus
- Keep Windows, your browser and apps updated. Most attacks use known, already-fixed flaws.
- Download software only from official sites or the Microsoft Store.
- Be wary of email attachments and links, even from people you know.
- Use a password manager and two-step verification on important accounts.
- Back up important files to an external drive or cloud storage so ransomware can’t hold them hostage.
What about Mac and Android?
macOS includes built-in malware protection, and Android has Google Play Protect, which scans apps. For both, the safest approach is to install apps only from the official app stores and keep the system updated.
FAQ
Is Microsoft Defender good enough?
For most home users, yes. It is built into Windows, free and updated automatically.
Are free antivirus programs safe?
The well-known ones from established security companies are, if you download them from the official site.
Can I use two antivirus programs together?
Don’t run two real-time scanners at once. Windows turns off Defender’s real-time protection when you install another antivirus.
What happened to AVG Free from Grisoft?
Grisoft renamed itself AVG Technologies, and AVG later became part of the same company as Avast. AVG AntiVirus Free is still available.
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quick heal
Now i’m using the AVG anti virus and i found that anti virus is awesome compare to the others………
i want best antivirous.which one best ?
Avast is my all time favorite. I have been using it for over 4 years now. Very recently they have come up with their new upgrade Avast Antivirus 5.0.545 which has a user friendly and easy to use interface. No other antivirus program offers you real time sheilds such as File System Shield, Mail Sheild, Web Sheild, P2P Sheild, IM Sheild, Network Sheild and Behaviour Sheild etc like Avast does. I would recommend all of you to try this one and Im sure you would love it. The best part is that it does not consume much on your system resources and hence does not slow down your system. Hats off to Alwil team for developing such an amazing product free for Home users.
i want to ofload avg anti virus free 9.00
I have been very pleased with PC Tools. The antivirus spyware doctor, and Registry Mechanic. It’s easy to use, and you’ll get a trial period to try it out, and then a yearly renewal at $29.95 for each program. I like it much better than McAfee or Norton.
Please i need a good antivirus on my system.
avast antivirus home edition is the best best best in the world
I’ve used many antivirus already. Norton, Mc affe, avg, avira, avast, bitdefender. norton made my pc run slower, others just doesn’t leave your computer 100% protected like avast and avg, but i suggest you people to use the free avast first because i believe that it can better protect your computer than the other free antivirus. but if you still got infected, install and scan your computer with avg as it can sometimes heal or fix the virus that the other antivirus are neglecting. {^^,}
IT is a waste of time.I doesnt get downloaded for hours.
I need to kick out all the Viruses, Worms, and that is sure to be done by AVG
please sent latest avg anti virus to me. Thanks.
Hi…………..
from last 1yr i have been using Quick Heal but now im facing problem with QH, thts why now i want to install the best of best package on my PC
Pl suggest the best one.
I have used all of he above anti-virus. For the begining I suppose AVG,COMODO, AVIRA are all good solutions. But for little advanced usage like constant internet, small resource usage and etc. I would recomend Avast along with PC Tools ThreatFire. Avast uses good detection rates with regular interval updates, acts as a transparent firewallinfront of your browser which blocks many malwaresand virus in first step, rest can be removed during scan and small resource usage while Threatfire almost the same but lages in detection rates, it is only better because it uses behaviour-based detection which is a good step n free security.
So Avast along with PC Tools Threatfire is the best for Home usage but don’t ask it to do all for you and behave like complete professionals, there are others like NOD32, Kaspersky and also ZoneAlarm for that cause.