Free Malware, Spyware, and Adware Protection
The end of the school year is in sight, and kids are dreaming about summer vacation. Grownups, too! But don't let your guard down. Malware coders take days off, too, like any other workers, but they don't all hit the beach at once. If your planned European vacation or family trip to a theme park strains the budget, you can still keep your computers and devices protected against malware attack by using a free antivirus program. The best of these freebies score better than many competing premium product in independent lab tests. We've reviewed 15 free antivirus utilities to help you choose the one that's best for you.
Quite a few of these products are free only for noncommercial use; if you want to protect your business, you have to pony up for the paid edition. At that point, you should probably consider upgrading to a full security suite. After all, it's your business's security on the line. And if you've grown beyond SMB status, investing in a SaaS endpoint protection system will let you monitor and manage security across your entire organization.
Your antivirus should definitely have the ability to root out existing malware, but its ongoing task is to prevent ransomware, botnets, Trojans, and other types of nasty programs from getting a foothold. All of the antivirus programs in this collection offer real-time protection against malware attack. Some take the fight upstream, working hard to ensure you never even browse to a malware-hosting site, or get fooled into turning over your credentials to a phishing site.
Independent Antivirus Lab Test Results
Around the world, researchers at independent antivirus testing labs spend their days putting antivirus tools to the test. Some of these labs regularly release public reports on their findings. I follow five such labs closely: AV-Comparatives, AV-Test Institute, Simon Edwards Labs (the successor to Dennis Technology Labs), Virus Bulletin, and MRG-Effitas. I also take note of whether vendors have contracted for certification by ICSA Labs and West Coast Labs.
Security companies typically pay for the privilege of being included in testing. In return, the labs supply them with detailed reports that can help improve their products. The number of labs that include a particular vendor serves as a measure of significance. In each case, the lab considered the product important enough to test, and the vendor felt the price was worthwhile. The labs don't necessarily test a vendor's free product, but most vendors pack full protection into the free product, enhancing premium versions with additional features.
We Test Malware Protection
In addition to carefully perusing results from the independent labs, I also run my own hands-on malware blocking test. I expose each antivirus to a collection of malware samples, including a variety of different malware types, and note its reaction. Typically the antivirus will wipe out most of the samples on sight, and detect some of the remaining ones when I try to launch them. I derive a malware blocking score from 0 to 10 points based on how thoroughly the antivirus protects the test system from these samples.
Since I use the same samples month after month, the malware-blocking test definitely doesn't measure a product's ability to detect brand-new threats. In a separate test, I attempt to download malware from 100 very new malicious URLs supplied by MRG-Effitas, typically less than a day old. I note whether the antivirus blocked all access to the URL, wiped out the malicious payload during download, or did nothing. Norton holds the current top score in this test, followed by Avira Free Antivirus.
If you're interested in learning more about my testing techniques, you're welcome to read more about how we test security software.
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Just about every antivirus product scans files on access to make sure malware can't launch, and also scans the entire system on demand, or on a schedule you set. Once that cleaning and scheduling is done, blocking all access to malware-hosting URLs is another good way to avoid trouble. Many products extend that protection to also steer users away from fraudulent websites, phishing sites that try to steal login credentials for financial sites and other sensitive sites. A few rate links in search results, flagging any dangerous or iffy ones.
Behavior-based detection, a feature of some antivirus products, is a two-edged sword. On the one hand, it can detect malware that's never been seen before. On the other hand, if it's not done right, it can baffle the user with messages about perfectly legitimate programs.
One easy way to keep your PC protected is to install all security updates, both for Windows and for browsers and other popular applications. Windows 10 makes it easier than ever to stay up to date, but there are plenty of security holes in older Windows versions, in popular apps, and in add-ons. Scanning for vulnerabilities in the form of missing updates is a feature most often found in commercial antivirus products, but it does turn up in some free ones. In the chart above you can see which products include these useful features.
What's Not Here
This article reports only on free antivirus products that received at least a good rating in our reviews—three stars or better. Among those that didn't make the cut is Microsoft Windows Defender, with 2.5 stars. All of the independent labs I follow do include Microsoft in testing, but most use it as a baseline. If a product can't do better than the baseline, it's got real problems.
Newly joining the party are a pair of free utilities devoted entirely to ransomware protection. Cybereason RansomFree and Malwarebytes Anti-Ransomware Beta exist for the sole purpose of fending off any ransomware attack that your regular antivirus misses. I include them in the blurbs below and encourage you to add one or both to your malware-fighting arsenal. They don't appear in the chart simply because they don't do the job of a full-scale antivirus utility.
There are also numerous free antivirus utilities that work solely to clean up existing malware infestations. You bring out these cleanup-only tools when you have a nasty malware infestation. When the problem's gone, they have no further use, since they offer no ongoing protection. Our Editors' Choice in this category is Malwarebytes Anti-Malware 3.0, and it's definitely one you should try if you've got a malware problem. But since they're free, you can keep trying others if the first one doesn't do the job. When the scare is over, you'll need a full-blown antivirus for ongoing protection.
What's the Best Free Antivirus?
Our current Editors' Choice products for free antivirus utility are Avast Free Antivirus and AVG AntiVirus Free. Both get very good scores from the independent labs, and in our own tests as well. Both include some useful bonus features. Avast in particular packs a password manager and a network security scanner in its toolkit. If you do have a little cash in your budget for security, the best paid antivirus products do tend to offer more and better protection. If not, try a few of these free tools and see which one you like best.
%displayPrice% at %seller% Avast Free Antivirus 2017 combines a great free antivirus with a surprisingly extensive collection of bonus features. Read the full review
%displayPrice% at %seller% AVG AntiVirus Free has a new look, and some new technology, but our hands-on tests and independent lab tests show that it's just as reliable as ever. Read the full review
%displayPrice% at %seller% Bitdefender Antivirus Free Edition includes precisely the same antivirus technology found in the commercial Bitdefender Antivirus, without the paid edition's many useful bonus features. Read the full review
%displayPrice% at %seller% ZoneAlarm Free Antivirus+ combines a top-notch firewall with antivirus protection licensed from award-winning Kaspersky. This free program can be a good choice if you don't want a full-scale security suite. Read the full review
%displayPrice% at %seller% The consequences of a ransomware attack are dire, so a second layer of defense like Cybereason RansomFree is a great idea. It's free; go ahead and install it. Read the full review
%displayPrice% at %seller% Malwarebytes Anti-Ransomware Beta watches program behavior to thwart any ransomware that gets past your existing antivirus. This lightweight, free utility makes a great addition to your security arsenal. Read the full review
%displayPrice% at %seller% Sophos Home brings the company's sophisticated business-grade antivirus technology to the home user, for free. It scores very well with the independent labs, and in most (but not all) of our own tests. Read the full review
%displayPrice% at %seller% The free Avira Antivirus gets excellent ratings from the independent labs, but in testing its scans were slow, and its browser protection only works with Chrome and Firefox. Read the full review
%displayPrice% at %seller% In a complete makeover, adaware antivirus free 12 has a new name and a new look. Under the hood, though, its test results aren't the best, and competing free products have much more to offer. Read the full review
%displayPrice% at %seller% The free Comodo Antivirus 10 has a new look, and it aced our hands-on malware blocking test. However, it didn't do as well on other tests by PCMag or the few independent labs that have evaluated it. Read the full review
%displayPrice% at %seller% Panda Free Antivirus boasts an attractive user interface and an unusual USB vaccination feature, but its scores have slipped in both our tests and independent lab tests. Read the full review
%displayPrice% at %seller% The free Qihoo 360 Total Security 8.6 comes with a ton of bonus tools, but its core antivirus protection doesn't measure up to the best free antivirus tools. Read the full review
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