If you're looking to shield your Windows PC, Mac or Android device from malware, we're here to help you pick the right protection.
There's no longer any question about whether you should use antivirus software. It doesn't matter if you're running Windows, Android or macOS — there's malware out targeting your machine. (There's even malware for iOS now, but no real iOS antivirus software as of yet.)
But what kind of antivirus software should you get? Will you need to pay for it, or is free software good enough? Is anti-malware software the same as antivirus software? Why are there so many different kinds of antivirus software, even from a single brand? And does using antivirus software pose a risk to computers?
The answers to all of those questions are complicated, but here are some basic tips to look for while shopping around. And don't forget to check out our top picks for both free and paid antivirus software and apps.
Pick software with a high malware-detection rate.
You'll want to make sure the antivirus software stops more than 95 percent of malware, whether it's commonplace malware or brand-new zero-day malware. But make sure that detection rate isn't accompanied by a high rate of false positives, which are benign files mistakenly flagged as malware.
Based on monthly testing by the independent labs AV-TEST and AV-Comparatives, Bitdefender, Kaspersky Lab, Norton and Trend Micro offer the best malware detection among Windows, Mac and Android AV products, free or paid, followed closely by Avast and AVG.
Some free antivirus products will protect your machine extremely well from malware. But the paid products tend to have many more extra features, especially on Windows. For example, Bitdefender Antivirus Plus has built-in ransomware protection, a file shredder, a hardened browser for secure surfing and a password manager.
Just keep in mind that you'll be paying for a yearly subscription to a software license, so factor in paying the same price again next year.
Look for a light system load.
You'll want to read Tom's Guide reviews of antivirus software to see how much each product slows down a machine, both in the background and during active scans. This is especially important for older, slower PCs that need antivirus software the most.
See how easy the software is to use.
Most antivirus users want a set-it-and-forget-it option, but sometimes it's good to get under the hood and tweak the software to your liking.
For example, Trend Micro lets you start scans right from the home screen, while Avira lets you fine-tune settings most people have never heard of. Again, read the reviews to get a sense of ease of use.
Try before you buy.
Most paid antivirus products on Mac and Windows will let you try a month for free. Most Android antivirus apps use a freemium model in which the basics are free, but useful extra features must be paid for.
Don't pay for more than you need.
Most antivirus makers sell three or more kinds of Windows products, each more expensive than the last. But each product by a single brand will detect malware just as well as the others. The differences lie in the extra features that each offers, such as parental controls, password managers, backup software or online storage. If you don't need what the more expensive products have, stick to the cheaper options.
Look for email and web protection.
You'll want antivirus software that automatically screens email attachments before you open them, and also checks websites before you load them. Almost all paid Windows AV software does both; among free products, Avast Free Antivirus, AVG AntiVirus Free and Bitdefender Antivirus Free do.
Don't settle for what came with your PC.
Many new Windows PCs come with one- or three-month trials of well-known antivirus products. But you'll have to start paying when the trial period's over. Don't give in — instead, shop around. You might be able to get something better for the same price, or even less.
Microsoft's built-in antivirus products are not yet enough.
Windows Defender, the antivirus software built into Windows 8.1 and 10, is steadily getting better and now is as good as lower-ranked third-party antivirus software. But for now, every product we've already mentioned on this page — paid or free — does a better job than Windows Defender or its Windows 7 predecessor, Microsoft Security Essentials.
Consider multiplatform, multidevice licenses.
If you've decided to pay for antivirus protection, and you have a lot of computers and smartphones, check out the bundles that cover several Windows, OS X and Android devices for a single price.
For example, McAfee LiveSafe protects an unlimited number of devices for $95 per year; Bitdefender Family Pack does the same, but with better malware detection, for $120 per year (currently 50 percent off).
Anti-malware software is not antivirus software.
Malware-removal products, such as Spybot Search & Destroy or Malwarebytes Anti-Malware, are great at cleaning up a system after an infection. But they won't prevent your PC or Mac from becoming infected in the first place. That's what antivirus software is designed to do.
Don't worry about the firewall.
Beginning with Windows Vista, the built-in Windows firewall became just as good as anything the antivirus makers could bundle in. As a result, many antivirus vendors no longer offer their own firewalls.
iOS antivirus software doesn't exist.
Some iOS apps have "antivirus" in their names, but they really only bundle anti-theft features, URL screeners and call blockers into a single package.
Shop the Best Antivirus Software and Apps
Here are the best antivirus software and apps for the money (in some cases, they are free), including PC, Mac and Android recommendations.