Internet security software provides all-in-one protection. The best Internet security software typically includes three essential components -- antivirus, anti-spyware and a firewall -- along with optional features, such as a spam filter and parental controls.
Superior protection, low system impact
Best Midrange AntivirusMost everything you need
Best Premium PC Security SuiteStill top of the class
Plenty of Windows users believe they don't need to pay for antivirus software. Many Mac and Android users think they don't need protection at all. Windows' high profile makes it the biggest target, but macOS and Android are also vulnerable to malware, even if they don't encounter as much of it.
We believe it's worth paying for Windows antivirus software, because even the best free software leaves out some protection features we consider essential. But you don't have to spend a lot. Many antivirus products are sold online for much less than their list prices. Mac and Android users have other options: Some of our favorite Mac AV products cost nothing, and most Android security apps have free versions.
— Two flaws that permitted full-system takeover were found in Trend Micro Premium Security and Maximum Security and their accompanying password manager, which is also distributed as Trend Micro Password Manager. ADVICE: Trend Micro has patched all three programs, so update them if you use them.
— All versions of Kaspersky antivirus software for Windows released since the fall of 2015 inadvertently let websites track users, a German journalist discovered. ADVICE: Kaspersky has patched the flaws, so make sure your Kaspersky software is up to date.
— A flaw in Bitdefender Antivirus Free Edition permitted full-system takeover. ADVICE: BItdefender has patched the flaw, so make sure your software is up to version 1.0.15.138.
Our evaluations were based on an antivirus product's interface, performance, protection and extra features. Was the interface intuitive and user-friendly? How badly did malware scans slow performance? How well did the program detect and remove malware? Does the program have any additional tools, and are they useful?
All of our Windows tests were performed on the same Asus X555LA laptop running 64-bit Windows 8.1 (later upgraded to Windows 10), with an Intel Core i3 processor, 6GB of RAM and a 500GB hard drive containing 36GB of files. To assess a program's impact on system speed, we used our custom OpenOffice benchmark test, which matches 20,000 names and addresses on a spreadsheet. The longer it took the laptop to finish the test, the heavier the performance impact. For smartphones, we used the Geekbench 3 benchmarking app.
Our Mac evaluations were conducted on a late-2013 MacBook Pro running OS X El Capitan 10.11. The Mac had a 2.6-GHz Intel Core i7 CPU, 8GB of RAM and 23GB of data on a 512GB SSD. For Android, we used a Nexus 6P smartphone running Android 6.0.1 Marshmallow.
For malware-detection scores, we've used the results of four independent testing labs: AV-TEST in Germany, AV-Comparatives in Austria, SE Labs in England and our own labs in Utah. Each lab subjects the major antivirus brands' products to stress tests involving thousands of pieces of malware, including hundreds of previously unseen samples.
Most antivirus makers have three or four tiers of Windows products, with each price bump adding extra features, such as parental controls or cloud backups. But because each company uses a single malware-detection engine for all its Windows antivirus software, the cheapest item — even a free one — in any product line usually finds malware just as thoroughly as the priciest.
Not all users will need premium suites, or even midrange products. If you don't have kids, or if you already have backup software, the basic product may be enough.
MORE: How to Buy Antivirus Software
The least-expensive paid Windows antivirus products, which generally list from $40 to $60 per year depending on the number of PCs covered, have the essentials. Definition updates and scans are automatic; websites and email attachments are screened, and the products are mostly easy to use. Some basic AV programs toss in extra features, such as file shredders or system optimizers, that are normally found in pricier products.
Not only does Bitdefender Antivirus Plus have nearly perfect malware-detection scores, but it also offers great value, with a strong selection of extra tools. You'll find a built-in password manager, a secure browser, VPN client software, protection against encrypting ransomware and automatic profiles that optimize Bitdefender's impact on your system, depending on whether you're working, watching a movie or playing a game.
These products usually list from $60 to $80 per year. They generally build on the basic packages by bundling in parental controls and a two-way firewall to catch outgoing data, although many add other features. But for the full feature set each brand offers, you'll have to pony up for the premium products.
Kaspersky takes first place among midrange antivirus software products, thanks to its excellent malware protection, a moderate system-performance impact and a full assortment of extra features and tools. Kaspersky Internet Security includes a secure browser, a virtual keyboard, specialized protection against ransomware, webcam protection to guard your privacy and VPN client software that automatically switches on when you connect to an unsafe Wi-Fi network.
Top-tier packages are often called suites because they do much more than catch malware. They might also offer file encryption, secure online storage, a password manager or an ad blocker. As most suites cover multiple devices, they also frequently bundle in licenses for Mac and Android antivirus software. For all this, you're meant to pay between $80 and $100 per year — but as with all paid antivirus software, steep discounts can often be found online.
Kaspersky Total Security has it all for those who want more than just excellent malware detection. This one rose to the top because it eliminates threats without generating many annoying false positives. We also like the included secure browser, which is ideal for online banking and shopping. Other highlights include a thorough file shredder and Windows backup and recovery software.
Free Windows antivirus products have gotten much better, and our top two choices offer excellent malware detection, if little else. The others provide adequate protection with a smattering of goodies such as password managers or parental controls. Among those is Microsoft's built-in Windows Defender, which has risen to the middle of our rankings. However, free antivirus software generally leaves out extra protection features such as dedicated defenses against ransomware or spam blockers.
Kaspersky Lab largely keeps quiet about its free antivirus product, but it's a winner, with a user-friendly interface, a fairly light system-performance impact and Kaspersky's nearly flawless malware protection. Just don't expect anything from it but the bare necessities.
Despite what Apple's marketing has implied, Macs do get infected, and the amount of Mac malware keeps rising, with more seen in the first half of 2017 than in any previous year. But there's less money to be made in the Mac antivirus market than in the Windows one, and the products are less standardized. Some Mac antivirus products are free, and some are paid. Of the products we recently evaluated, one of our No. 2 choices, Avast Free Mac Security, doesn't cost a dime.
Kaspersky Internet Security offers both the lowest system impact and some of the best malware-detection rates recorded. It even provides extra security features, including parental controls and options to lock down your webcam and stop websites from tracking your browsing activity. If you're willing to pay to protect your Mac from malware, Kaspersky Internet Security is the best option available.
Every Android device, whether it's a smartphone, tablet or TV stick, should have antivirus software. Usually, that software comes with an all-encompassing security app that also includes anti-theft and remote-locating features, and many apps have both a basic free version and a premium version with more features.
The free versions of the Android security apps we reviewed are pretty solid. The paid versions, which cost between $15 and $30 per year, range from being just a bit better than the free ones to becoming practically separate products, with a wide range of capabilities. You'll have to decide what you need and select accordingly.
The Bitdefender Android security app has flawless malware protection, a small performance hit, privacy-protection tools and Android Wear integration. Yet there are no scheduled malware scans, and no freemium option. (The separate Bitdefender Antivirus Free for Android only scans for malware.) Still, at $15 per year per device, Bitdefender Mobile Security is worth the expense.
A lot of people want iOS antivirus software for their iPhones and iPads. The truth is that such software doesn't exist. Apple won't let third-party apps examine other iOS apps, or even inspect new apps as they're installed. Anything that claims to be antivirus software swiftly gets kicked out of the iTunes App Store.
Many major antivirus vendors, including F-Secure, McAfee, Norton and Trend Micro, do have 'security' apps in the App Store. But these check web links for known malicious sites, locate lost devices or pretend to protect your privacy. None scans an iPhone for malware.
There has been real iOS malware that affects non-jailbroken devices, but it's very rarely cropped up. In each instance, Apple has pushed out a new version of iOS to stop the malware in a matter of days or weeks. Generally, if you keep your Apple mobile device updated to the latest version of iOS, you should be safe.
[Editor's Note: Best Buy has removed Kaspersky Lab products from its shelves, citing concerns regarding Kaspersky's alleged (but as yet undocumented) ties to the Russian government. Top U.S. newspapers have run stories in which anonymous sources say Kaspersky software helps Russia spy on American spy agencies. However, until we see real evidence that Kaspersky software is a threat to consumers, we will continue to recommend it. Here is further clarification of our position.]
Antivirus software is nearly as crucial as a PC’s operating system. Even if you’re well aware of potential threats and practice extreme caution, some threats just can’t be prevented without the extra help of an AV program—or a full antivirus suite.
Our quick-hit recommendations:
Read on to learn why these products rank best.
You could, for example, visit a website that unintentionally displays malicious ads. Or accidentally click on a phishing email (it happens!). Or get stung by a zero-day threat, where an undisclosed bug in Windows, your browser, or an installed program gives hackers entry to your system.
We’re not suggesting that PC security software is fool-proof. Antivirus software often can’t do much to stop zero-day exploits, for example. But it can detect when the undisclosed vulnerability is used to install other nasty bits, like ransomware, on your machine. Anyone who actively uses email, clicks on links, and downloads programs will benefit from an antivirus suite.
Our recommendations strike a balance between excellent protection, a worthwhile selection of features, and minimal impact on your PC’s performance. You can read about how we test antivirus suites below.
Updated 1/02/19 to include our review of Norton Security Premium (2019), which offers just minor revisions to the previous version but remains our top pick for AV nonetheless. Scroll to the end of the article to find links for all of our antivirus software reviews.
Norton Security Premium still does an excellent job of protecting your PCs, doesn't bother you too much, and has a very easy-to-use interface. Norton protection doesn't come cheap, however, at $110 per year for up to 10 devices.
Norton Security Premium is an old name in security, but it has an easy-to-use interface, highly rated protection, and a number of helpful extra features. It’s on the higher end of the price spectrum at $110 per year (your first year is discounted to $55), but you can install it on up to 10 devices. (Read our full review.)
AVG does an excellent job of protecting your PC. Its interface is not great, but for $70 you can protect all the Mac and Windows PCs in your household, as well as your Android devices.
AVG Internet Security does an excellent job of protecting your PC, but it’s interface could be a lot better. Nevertheless, with unlimited installs for $70 per year, it’s hard to beat this popular security solution. (Read our full review.)
Trend Micro Maximum Security has an easily navigable interface, great protection, and the price is right. Some of its privacy features didn't work reliably in our tests, but the cloud protection scanning is an interesting feature, and Mute Mode is a great take on the usual gaming mode feature. Overall, Maximum Security is a good choice for antivirus on Windows.
Many antivirus suites create an interface that’s as simple as possible for users to understand—but sometimes the software becomes too stripped down. That’s why our recommendation for novices is Trend Micro Maximum Security.
This antivirus suite, which provides highly rated protection, strikes a nice balance between complexity and simplicity: Four category icons at the top let you dive deeper into the suite, but if all you need to do is a scan, that option is right there in the center of interface. You can’t miss it.
Overall, no matter what you need to get done in Maximum Security, the interface doesn’t leave you with any guesswork.
There are three basic requirements that an antivirus suite needs:
That’s not all to consider, however. These days, many security suites come with extras such as a backup service for your most essential files, Android apps for mobile security, a more advanced firewall, family protection (read: child restriction) features, and the right to use the program on multiple PCs. Whether you need those extras depends on your personal situation.
First, we take a look at the interface to determine how easy or complicated it is. Does the interface make it easy to get at essential tools like PC scans and password managers, for example, or is everything buried under multiple clicks? Are there elements that look like they should be clickable but aren’t? Are alerts interactive or purely informational, and does that make sense in context?
We also examine the features on offer. Every good antivirus suite should have the basics like scanning and real-time protection, but many vendors offer elements that go beyond basic security like password managers or firewalls. We try to discern whether any of these extra features are particularly useful, or just frills that look nice but don’t serve a practical purpose.
To test the suite’s demand on system resources, we run two benchmarks. The first is PCMark 8’s Work Conventional test, which simulates a variety of workloads including editing spreadsheets, browsing the web, and running video chat.
We run the benchmark before the security suite is installed. Then we install the software, have it run a full scan on our Windows 10 test machine, and start a second run of the benchmark at the same time. Then we compare the overall scores to see if the decline between the two benchmarks is significant.
As a harsher stress test, we also use Handbrake to transcode a video before and after installing the A/V. On most home PCs, this encoding task utilizes 100 percent of the CPU. We then compare transcoding times to see if there’s any significant decline.
Our test machine is an Acer Aspire E15 with an Intel Core i3-7100U, 4GB RAM, and a 1TB hard drive. Each security suite is tested on a clean install of Windows 10 Home.
As for the antivirus suite’s detection capabilities, we’ll rely on the opinions of security researchers dedicated to this task. We’ll take into consideration reports from outlets such as A-V Comparatives, A-V Test and SE Labs.
We’ll also take pricing into account and what you get for it.
Whenever possible we’ll review security suites using a free trial to get a sense of what consumers see when they first try out a new product.
Looking for a cheaper option or something with more flexibility? Or perhaps you just want to see what else is out there? Below is a list of all the antivirus suites we’ve reviewed. We’ll keep evaluating new ones and adding them here, so be sure to come back to see what else we’ve tested.