Best Free Antivirus Software

Other Language?
  Read this article in Spanish
  Read this article in Chinese
In a Hurry?
  Go straight to the Quick Selection Guide

Antivirus software provides an essential layer of protection from viruses, trojans, worms, spyware, adware, dialers, keyloggers, and rootkits. Don't let the name antivirus confuse you. These days every good antivirus has good detection rates for all forms of malware, not just viruses. The term malware includes viruses, trojans, worms, spyware, adware, dialers, keyloggers, rootkits, and any other software which performs malicious activities on a computer.


Sadly, the amount of malware currently in circulation is so large that no antivirus could possibly detect all of it. Despite vendor's claims, no single antivirus solution can detect nearly all new malware. There are some products out there, including some in this review, which include technologies which are able to adequately protect a computer, but any product which relies mainly on detection is statistically doomed to fail at some time. Also, using more than one real-time antivirus at the same time uses much more system resources, can cause system errors, and can even reduce protection. For my advice on how to compensate for these weakness of antivirus products, to a large extent, please see my other article about How to Stay Safe While Online. Having a good antivirus product does go a large way towards adequately protecting your computer, but in this day I would highly recommend that you add additional layers to your security.


Below I have reviewed some of the most effective Free Antivirus products currently on the market. In order to make this review more unbiased, although of course my own intuition and experience does affect my judgment as well, I came up with a particular methodology for comparing these products. This methodology is described in the following section.

Methodology For Comparing Products

The main motivation behind why I came up with this particular methodology for this review is that I value system protection against real world threats above all other categories by which an antivirus is commonly judged. It does not matter to me whether an antivirus protects the user by detecting malware, blocking dangerous sites, behavioral analysis, sandboxing, or any other approach. The most important thing is that at the end of the day your system is safe from infection. Thus, that is the attitude I have taken towards reviewing these products.


Therefore, I found Antivirus testing organizations which claim to test products against situations which resemble real-world situations. I narrowed these down by further requiring that the organizations have a relatively long record of producing good, seemingly unbiased, results. The organizations I ended up with, and therefore used for this review, are:



Dennis Technology Labs

From here I looked at all tests ranging to the beginning of 2013. However, if there were more than three tests within that range I used only the most recent three. Also, if given the choice between results from different operating systems, I chose that for the most popular operating system. At the moment Windows 7 is the most popular operating system.

Also, I only considered results if it was specifically the Free Version which was tested. This is because the results for the Paid Version of the products in this review, with the exception of Comodo Antivirus, are often quite different from those for the Free versions.

In addition, I did not count it against any of the products if they were not tested by multiple organizations. As long as they were tested by at least one, within the above-mentioned period, they were considered. This criteria was chosen because there are many reasons to choose not to participate in a test. Thus, it should not be held against the product if they were not tested by multiple agencies. However, if they were not tested by any, this makes it impossible to compare them in an unbiased fashion.


Once this data was collected, I then looked at the overall results for the Free Antivirus products discussed in this review, and ordered them mainly according to the quantitative results. However, my own knowledge of the products, and the reviews and experiences of others, were also considered. The results are presented and discussed below.

Discussion And Comparison

Comodo Antivirus is my top pick for advanced users or for Intermediate users who are okay with an antivirus software which will occasionally ask them for input. However, if you do not fall into those categories, or for any other reason find it to not be a good fit for you, then you will likely find my next pick suitable. Also, for those who prefer a complete solution, there is always Comodo Internet Security, which is also free and includes a firewall in addition to all other components which already come with Comodo Antivirus.

The reason I made this my top pick for advanced users or users who are okay with a somewhat talkative antivirus software, is because it is the only product which I feel confident saying that it will protect you against nearly 100% of real-world threats. I have a lot of experience with this product. I am a volunteer moderator on the Comodo forums and have been using it for a long time. I know this product very well, and am entirely confident in its ability to protect.

Comodo Antivirus uses the cloud to facilitate the detection of the most recent malware, as do many other Free Antiviruses reviewed in this article. However, Comodo also incorporates a Behavioral Blocker, which will automatically sandbox all software which it does not know for sure is safe. Thus, the user is protected from nearly all malware, which will either be detected by the antivirus component or sandboxed by the Behavioral Blocker. It will also analyze unknown applications for suspicious behavior, and alert the user accordingly.

However, as mentioned previously, users who do not want a somewhat talkative antivirus should continue to my next pick. Also, by default Comodo Antivirus has small advertisements (which can be disabled as shown here). Also, during installation users should be sure to click the Customize Installer option, which is near the bottom-left of the installation window. This will allow them to uncheck additional software, which the installer will automatically install with Comodo Antivirus unless unchecked. This software is not dangerous and includes a browser, and ad-blocking addon, and an optional paid service which would allow Comodo technicians to assist you with any computer problems you have. These, and a later option to change your homepage to support Comodo, can safely be unchecked during installation. Even with this extra hassle, this software is still my top pick, but I do wish they made the process simpler.


Avast! Free AntivirusAvast! Free Antivirus is has very good protection rates. Avast has many different protection shields, boot-time scanning, a behavioral blocker, an internet site ratings plugin, script malware protection, and access to cloud-based protection. It's arguable whether their ratings plugin offers comparable levels to WOT, but the script malware protection can prevent certain browser exploits, a feature not available in any of the other free AV's reviewed.

Avast is also relatively light on resources. However, do note that Avast requires a free registration to function after 30 days, and the default installation installs the Chrome browser unless you uncheck it. Also, note that the OpenCandy advertising component is integrated into the Software Updater tool in Avast. More information about OpenCandy can be read here. Thus, if a user selects this option during the install they will end up with OpenCandy on their computer. Please be very careful about this option if you choose to install 


Panda Cloud AntivirusPanda Cloud Antivirus is another excellent choice for average users, who may find both Comodo Antivirus and Avast too confusing. It has a simple interface, completely automated features, access to cloud-based protection, and has been shown to be very good at protecting a computer. Panda Cloud Antivirus has a behavioral blocker, web protection, and access to cloud-based protection, all of which will help increase your security.


AVG Anti-Virus Free EditionAVG Anti-Virus Free Edition is also a decent choice for average users. My analysis of the results, as discussed in the methodology section, does show that it does a decent job of protecting your computer. However, it appears that the above Antivirus products tend to do better. Also, it comes with advertisements (but they can be disabled).


Avira AntiVir Personal EditionAvira AntiVir Personal Edition is another product which has a very good reputation. However, the free version was not tested by any of the three testing organizations I referenced in my methodology. Therefore, I cannot currently recommend it above any of the previously mentioned products.

However, other comparative tests do show that it has very high detection rates for malware. Also, many users have used it and found that it is very effective. Also, users have access to cloud-based protection. AntiVir is certainly a good choice for a free antivirus, but due to the lack of real-world testing, at this time I cannot recommend it above the other products in this review. Hopefully in the future they will have the free version tested by these organizations as well.


Bitdefender Antivirus Free Edition

Bitdefender Antivirus Free Edition is another free antivirus product which has a very good reputation. However, the free version was not tested by any of the three testing organizations I referenced in my methodology. Therefore, I cannot recommend it above any of the previously mentioned products.

The engine for this product appears to be the same as for the commercial product. However, the level of protection provided has not been shown identical with the paid version, which is why I did not use the results for the paid version in my analysis. The user interface for this product is very minimalist. Thus, it may be attractive for novice users, though more advanced users may be frustrated at the lack of customization. Bitdefender Antivirus Free Edition is a good choice for a free antivirus, but due to the lack of real-world testing, at this time I cannot recommend it above the other products in this review. Hopefully in the future they will have the free version tested by these organizations as well.


Please help us by rating this review

Related Products and Links
Related Free Antivirus Software Articles

Related Security Articles

Have Your Say

Please visit our freeware forum to share and discuss your views and get advice on free security software, including antivirus software. To post in the forum you need to register first but that's quick and immediate.

Quick Selection Guide

Comodo Antivirus
Gizmo's Freeware award as the best product in its class!

Runs as a stand-alone program on a user's computer
This has full real-time protection capability, including real-time antivirus, behavioral blocking features, cloud-based protection, and an automatic sandboxing function which protects users from nearly all malware.
The automatic sandboxing function, although not very intrusive, may be too talkative for some users. Also, by default non-intrusive advertising is enabled (although it can easily be turned off).
Version 6.x
32 and 64 bit versions available
Unrestricted freeware
There is no portable version of this product available.
Windows XP, Windows Vista, Windows 7, Windows 8.x

Take care to avoid the installation of unwanted software during installation. To do this use the customized installer button, which is on the lower left-corner of the screen during installation. Additional software, including a browser, an ad-blocking addon, and an option paid service which would allow Comodo technicians to help you with computer problems, are all included by default.

Avast! Free Antivirus
Runs as a stand-alone program on a user's computer
This has full real-time capabilities, behavioral blocking features, script malware protection, and a low rate of false positives.
Default settings require certain user interaction. It is bundled with Chrome browser by default, and if not carefully avoided during installation the user may accidentally install OpenCandy (see discussion for clarification).
Version 9.x
32 bit but 64 bit compatible
Feature limited freeware
There is no portable version of this product available.
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8.x, Mac OS

Take care to avoid the default inclusion of the Chrome browser and OpenCandy during the install process by using the custom install option. The attempt to install these will also be repeated at the program update if the automatic option is chosen.
Quick Start Guide:

Panda Cloud Antivirus
Combines a web service with a stand-alone program
High detection rate of malware, web protection, some behavioural blocker features
Detection rates of real-world malware is slightly lower
Version 2.x
32 and 64 bit versions available
Free for private use only
There is no portable version of this product available.
Windows XP, Windows Vista, Windows 7, Windows 8.x
AVG Anti-Virus Free
Runs as a stand-alone program on a user's computer
Behavioural blocker
Slightly lower signature detection rates
Version 2013.x
32 and 64 bit versions available
Free for private use only
There is no portable version of this product available.
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8.x

Forum for support

Avira AntiVir Personal Edition
Runs as a stand-alone program on a user's computer
Outstanding detection of malware
Not the most user friendly
Version 14.x
32 bit but 64 bit compatible
Free for private use only
There is no portable version of this product available.
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8.x
Bitdefender Antivirus Free Edition
Runs as a stand-alone program on a user's computer
High detection rates, very user friendly
Lack of customization
Version 1.x
32 bit but 64 bit compatible
Free for private or educational use only
There is no portable version of this product available.
Windows 2000, Windows XP, Windows Vista, Windows 7, Windows 8.x


This software category is maintained by volunteer editor Chiron. Registered members can contact the editor with any comments or questions they might have by clicking here.


free antivirus, best free antivirus, free antivirus programs, free antivirus program, antivirus software, free antivirus software,  antivirus program free, anti-virus programs, antivirus scanner, best antiviros, best antvirus

Back to the top of the article


Share this
Average: 4.3 (1965 votes)
Your rating: None


by JonathanT on 18. May 2009 - 7:00  (21765)

Thanks for the interesting suggestion. I'll see if I can add this information in soon.

by Anonymous on 15. May 2009 - 11:19  (21625)

AV component of CIS is not great for standalone use, but whole CIS works flawless with Avira AntiVir. Today is released the new CIS v3.9.76924.507, and brings a lot of fixes and improvements.

by Anonymous on 13. May 2009 - 3:28  (21465)

Does anyone have a recommendation on Comodo antivirus?

by Anonymous on 13. May 2009 - 8:13  (21477)

Why use it when
AVIRA Antivir Personal and avast! Home
are Freeware with better Protection/Detection/Removal?

Comodo AV is NOT as strong as Comodo Firewall...

by Anonymous on 11. May 2009 - 18:35  (21382)

Could you try and find out as much info about rising av free 2009 with the hips and the pros and cons about it. I know its got a bad rep so far from what I've heard... I've been using it now for sometime because once I installed it I couldn't fully remove it. So I've gone back to using it since it conflicted with my ISP's Internet Security by RadialPoint. I've tried Avira but have issues with it often then I went back to avast but its given me problems from time to time. It is however my fav of the free ones. I think rising is better than Avg in my opinion a more complete product and I think if its not 3rd of the top free it should be forth. I tend to try out products that I think look interesting then have trouble removing them... I know its going to take a fresh format of Vista to cure it but its a time consuming task that we put off till there is no way to boot up the pc lol... If you could find the time to test the rising av 2009 free verison and add your comments about it that would be greatly appreciated since most of us prefer your recommendations. I've been using software you reccommended now for at least 7 years I believe if thats right. I've lost track and fully trust your opinion. Thanks Guys keep doing what you do best.

by MidnightCowboy on 13. May 2009 - 23:23  (21523)

Thanks JT - yes, as per my post a few steps down there is still a lot of uncertainty about just how good this software is. Some say that it must be good because Google opted to put it in their Chinese "pack", but how much choice they may have had I guess we'll never know. In truth AV performance is quite easy to compare because you just feed a load of junk codes to a range of programs and see which finds the most (usually Avira, GData etc).

HIPS are more difficult because for one reason they require user input which may give an incorrect response. What I would say is this. It appears that (maybe because of past software residue in your computer) you are having difficulty getting other stuff to work, but if you've used Rising for a while now and not been infected then it's obviously working for your surfing habits so stick with it.

Ultimately though, in view of your comments, the best path to optimum protection is going to be via a reformat, but if you do try taking a drive image this time in case something similar happens in the future.

by JonathanT on 12. May 2009 - 12:04  (21426)

You could post this on the forums to get a wider range of opinions.
Also you could post on the HIPS page, maybe MC will know more about this.
I believe the antivirus component is not that good, so it wouldn't really qualify to be on this page.

by Anonymous on 11. May 2009 - 15:47  (21372)

Just want to thank you for your educated opinions on here keep up the good work people.

by Anonymous on 11. May 2009 - 5:51  (21354)

avira9 causes system freeze the moment I right-click anywhere.

by MidnightCowboy on 11. May 2009 - 17:58  (21380)

One of us I'm sure may to able to offer a solution.
Can you help us out first by answering a few questions?

What makes you attribute the cause of this condition to Avira 9?
What other active security programs do you have installed?
How long has Avira 9 been on your computer?
Is this a recent development?
Which (if any) other AV did you uninstall before adding Avira?
What is your OS version?

by Anonymous on 11. May 2009 - 4:47  (21351)

Has anyone heard of rising antivirus?.If so,is it any good?........

by JonathanT on 11. May 2009 - 6:36  (21356)

In the last test I saw Rising scored quite poorly compared to the top picks. But it also has a HIPS component which is quite interesting.

by Anonymous on 10. May 2009 - 13:17  (21312)

Regarding Panda Cloud - fortunately I was able to uninstall this garbage before it crashed my computer for good. As it was, it took me about 30 minutes for my pc to unfreeze just so I could get to the control panel to purge this abortion of a program, and to restart computer. I had started the virus scan, it got to about 400 files and then froze - when I tried to cancel the scan and close the program, that's when everything froze up. Nothing's ever frozen it and now I'm p****d. Don't take any chances with this program, even though I've read other positve reviews. The way I see it, if any program freezes a pc that has never had any problems in nine years of operation - even one out of a million - that's trash to be avoided.

by MidnightCowboy on 11. May 2009 - 0:28  (21344)

Thanks for your feedback.

I must admit to liking the concept of this a lot until I learned that you will have to pay to get full protection in the "free" version once the beta testing period expires. Without this the program will be next to useless. As for the freeze, well it is clearly labeled as beta software and therefore you must expect some bugs, and certainly not a reason to dismiss it completely. Although Panda have invested a lot of time and resources into this application time and it's proven detection rate will ultimately determine how successful it will become. Certainly I can't see very many people being willing to pay money for this when there are plenty of top performing solutions already available which really are "free".

by Anonymous on 5. May 2009 - 17:20  (21087)

Anyone have any opinions on Rising AV free 2009?

by MidnightCowboy on 5. May 2009 - 17:50  (21088)

There is still a huge diversity of opinion regarding the effectiveness of Rising AV, even if you ignore the ongoing scandal about their alleged illegal business practices.

In truth, the reliable independent test results are poor in comparison but supposedly do not include the additional protection provided by the HIPS component. In other words, if the signature scanner misses your nasty then another program module will recognize it on activation and prevent it from running and causing damage. On this basis poor results from a pure signature scan with nothing else enabled will give a misleadingly low result. There are however various concerns about it's high rate of "phone home" connections.

Overall I would suggest that there are other more proven solutions available with either Avira, or Avast, maybe even Comodo now, to make waiting a while longer to see how Rising 'matures' a worthwhile option.

The GUI is the best I've seen though and some other vendors would do well to notice this!

by Anonymous on 4. May 2009 - 20:22  (21057)

I can't get the avast! download or homepage to work. Please help!!!!!!

by JonathanT on 5. May 2009 - 6:48  (21070)

It's fixed now, thanks.

by Anonymous on 4. May 2009 - 5:23  (21029)

wondering what there is to be said about the new kid on the block? Panda Cloud Anti-virus free. I want to try it out but just want to know should I wait to test it out or should I help panda out and try the beta...

by Anonymous on 2. May 2009 - 8:41  (20928)

Regarding Avira Antivir "disable":

The comment below works for the Administrator but NOT for USERS of Windows XP Pro.

by Anonymous on 2. May 2009 - 8:20  (20927)

Jonathan T., Hi,

Regarding Avira Antivir "disable":

I use windows xp pro.

I tried following the instructions that begin with run "gpedit.msc", but it didn't work. I found a site that suggested to run "secpol.msc". I have no idea what these programs do, but the "secpol.msc" stopped the new popup.

Hope this helps someone.

by JonathanT on 2. May 2009 - 14:48  (20941)

Thanks for the info. I believe that site has some updated tips for AntiVir 9.

by Anonymous on 3. May 2009 - 7:09  (20979)

Glad I could be of some meager help to this excellent site.

by Anonymous on 30. April 2009 - 20:12  (20853)
by Anonymous on 30. April 2009 - 21:33  (20858)

From their site:
'Once the Beta period has finished, the detection capacity of the antivirus will reduce considerably as it will no longer have access to our Collective Intelligence servers.

From then on, you can get the free version and benefit from special conditions when you buy the full service.'

by peter on 30. April 2009 - 22:00  (20860)

I added your comment to the above forum link where an inforamtive debate has started.

by Anonymous on 30. April 2009 - 22:15  (20861)

cheers, see FAQ in help section on

by Anonymous on 30. April 2009 - 14:57  (20842)

I'm having problems installing Avira AntiVir 9.0. I downloaded it to my desktop (Windows XP) but when I went to open and install it, I could not open it because I was asked which program I wanted to open the file with.
Please advise.

by MidnightCowboy on 3. May 2009 - 18:15  (20995)

It's difficult without knowing all the circumstances but this might be a settings issue with your download option/browser. Try again using a different browser or a program like Free Download Manager.

Gizmo's Freeware is Recruiting!

Gizmos Needs YouShare your knowledge of free software with millions of Gizmo's readers by joining our editing team.  Details here.