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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Gays … AVG Site Says The Free Version Does not Have:
# Protection against identity theft, hacker attacks, infected downloads, infected instant-messaging and spam
# Protection for business computers, networks, and servers
Check At : https://www.avg.com/en-us/free-antivirus-download#tba1
So How Can We Trust It
Comodo Internet Suite works great on my pc.
I used to use only the Comodo Firewall. I find its OS Firewall very useful for detecting virus activations and other suspicious activities in my computer.
A drawback: sometimes Comodo just doesnt go resident and active anymore. I just uninstall and reinstall the whole thing and it’s good again.
Not bad for a freebie…
Which Anti-Virus(Free)is the best for my Laptop.
My AVG still can’t detect viruses than other antivirus program even after i’ve completely up dated every day.
I’ve try to check through with panda scan online, and still there were alot of files infected found.
Why my updated AVG still couldn’t find those viruses??
AVG is not quite good antivir but still i’m using it because it’s free and i’ve let my computer with a viruses unhealed.
for free avg 8 is best and for paid version kaspersky and avir premium both r best.
avg was excellent and reliable free antivirus software……….for all computer using people
i have been using avast for years…
No problem so far… it’s very good
it’s works strongly then others antivirus then i love it
it is very best antivirus
Good Day,
please i want to have a latest avg anti virus ,in other to say away from virus.
Thanks for making me happy
please help me out fom viruses
hi this is my first time i download free antivirus.so i hope it will active and strong
Avast is better than AVG in detecting viruses…
N/A
hy guys,avast seems to do be its dificult to gets the updates,so i think nortion is better
hi this is my first time i download free antivirus.so i hope it will good.thank you
this the best antivirus software
I have been testing few antivirus..
Avast is good followed by avg & kaspersky..
i will not suggect macfee n nortan as the utilized huge amount of system resources
It’s all going mad.
AVG 8.x follows norton & mcafee by swallowing resorces !
Please suggest a fast @ effective Antivirus software !!!
Thank U !
AVG 7.5 detected 3 trojans that Norton missed.
AVG 8 seemed preety effective along with
THREAT FIRE antispyware and COMODO firewall (COMODO
can drive you mad sometimes with all its pop-up
warnings)but all three could not prevent or detect after lots of scans a malware
that caused continuous system crashes.Only AVIRA FREE detected it and isolated it with its high sensitivity ANTIVIR.But AVIRA FREE has a big disadvantage:doesnt offer e-mail scanner.
hi we need fast virus scanner
avg is excellent software………..
Your article while valid for when it was written, in my opinion is no longer true. AVG 8 is now a resource hogging pig like Norton AV, both on your system and internet. Since they no longer support the free 7.X versions there is no choice but to upgrade to ver. 8.X. I have since tried Avast and Nod32 Trial, both of which pick up other antivirus/firewall .exe’s as viruses. Nod32 didn’t like Zone Alarm at all and Avast didn’t like AVG. You could argue that they were infected by viruses, but nothing else was infected on my system, which does seem a little strange.
You try this page here
http://www.freebyte.com/antivirus/#scanners
Jack
does anyone use pc tools anti virus? I just downloaded it to my laptop because AVG no longer updates it’s $59.99 or something in that range.
AVG version 8 has my cpu running at 100% most of the time and I’m not the only one. It’s good but a real resource hog that slows me down big time
Would agree with earlier comments the AVG interface is very easy to use. Thanks for posting
quick heal is the best dont try this all makes the system slow.
I want to download one of the best free antivirus programe.
If you can let me download your antivirus free, i will be emiently happy
your antivirus softwares are very good and i like them. THANK YOUUUUUUUUUUUU
I am one of free AVG users. I’ve been using it for about 2 yr, but I got Trojan Horses attack 2 days ago from YouTube (my guess). AVG just shows my notebook already infected. I takes 1 full day to run system scan and wipe them out. Now, I think this tool is not good enough to use. One of my friends suggests “Zonealarm.” Any comment?
hi
another thing is that u can use windows starter kit from http://www.download.com. I think that includes all the essential security tools. much better one.
hi all,
i used many of the antivirus programmes. But most of the antivirus programmes u will get it as free. but very few functions wont be there.u will get McAfee from from here. . u will get norton free from here.http://pack.google.com. when u use a crack key for antivirus programme, the problem is that it wont get updated.
kaspersky acts as big brother – it will not allow any other antivirus or antispyware. Avoid it.
AVG antispyware detects and kills spies.
C.O.M.D.O looks great – dont know how good it is.
Superantispyware works only once.
annie
Norton and Kapspesky are very slow.
AVG detects only few viruses – and it cannot heal.
AVG antispyware is really great.
PC tools antivirus and avesth are good for nothing.
C.O.M.O.D.O detected and killed the microsoftpowerpoint.exe virus at the time of its entry into my computer. But it talks too much.
AVIRA kills many of your useful .exe programs without much prick of conscience.
– a user
i want best free antivirus of yearly version
please permitted to free download to antivirus in my pc.
thanks
i wait to see this antivirus
I think it is a nice piece of software but still leaves something to be desired. It’s detection rate is less than 90% compared to 95%+ for Antivir. All of the fancy bells and whistles mean very little if it lags behind in its most basic function of catching all of the viruses. If Alwil could bump up the detection rate to compare to Antivir, then it would be the top pick. Otherwise, if what’s most important to you is that the *ANITVIRUS* software catches the most viruses, then go with Antivir. The only thing that really sucks about Antivir is that it force feeds you ads for the company’s product line when it does an update. You can firewall block the ad sites, but then antivir throws you an error message.
i have been using avast also for 1 year and I think it’s the most easiest and reliable antivirus.
I would recommend avast home edition or nod32.they are good and does not slow down the system!
I think that your web site is very important for all people all over the world
i’ve been using avast for nearly 2 years now and have had no problems with it infact i favour avast over kaspersky or any other antivirus that i have used so far and i think that symantec and mcafee have alot to learn from these guys even kaspersky in one sense as well as i have tried these for a year or more each and have only really been impressed with avast over the others
I’v been using Avast anti-virus for 2 years now and think it’s quite effective and takes up very little resources, it is excellent in detecting viruses but bad at repairng them.
yes Its true the software detect the virus but do nothing about it!!!
now i’m using the kaspersky anti virus and i found that anti virus is awesome compare to the others
I’ve been using Avast for 2 years now, I work in the computer industry and I think its a great product. it uses a far smaller footprint than the bloatware that is Symantec and Mcafee. You hardly even notice its there running all the time, uses very little CPU, some of the big boys should look at how efficient this product has been written. We’re currently considering throwing out Symantec in favour of the Avast Enterprise Edition for servers.
I have been using Avast for about 2 years now and I think I have been protected most of the time. But that’s also because I am a very alert user. But I think Avast also uses less of the system resources as compared to a Norton.
For those who are looking for freeware antivirus, I would Avast Home Edition. It has amazingly small (and almost daily) online updates, has a very good detection engine, and its resident shield is extremely effective against spurious sites and malware.
AVG is another excellent alternative. It has a easier interface than Avast, but I think its detection rate needs a bit of improvement. I would say that it can be useful as a secondary antivirus package on a home system.
McAfee Stinger & Avast Cleaner are useful in case of new virus/worm outbreaks.
i was one of early users of AVG n just now installed AVG in my new hd n came across this post
AVG is my fav n never found any alerts thru stringer but worth dln
PC World does seem to think differently about free anti-virus programs, but I’ve still used AVG most of my computer life. However, I’m now using the Windows OneCare.