The best free antivirus in 2026, honestly: what free really gets you
Free antivirus is real, but it comes in three very different shapes. Some is built into your operating system and is already running. Some is a free tier from a security company that hopes you'll upgrade later. And some of what's labeled "free" is a trial that turns into a subscription, or a scan that cleans up one infection but doesn't block the next.
PrivacyTechReview Editorial Team·Editor-in-Chief: Kirill Prosandeev·Reviewed Oct 29, 2026·12 min read
Ad-supported — we may earn a commission from links on this page, at no cost to you, and it never changes our assessments. How this works.
This guide sorts them out. We rank only products that give you real-time protection at no cost — Microsoft Defender Antivirus, Avira Free Security and Avast Free Antivirus — and set out what each free version includes and leaves out, according to the vendors' own pages as of October 29, 2026. Apple's XProtect and Google Play Protect get a short note, because they're already on most Macs and Android phones. Norton, McAfee, TotalAV and VirtualShield don't give away real-time antivirus, so you'll find them in the section on trials rather than in the ranking.
Still deciding whether free protection is enough at all? Our guide "Is free antivirus enough?" covers when paying makes sense. This page assumes you want to stay free and helps you choose how.
What free versions usually leave out
Every free option ranked here does the core job: it scans files as you open them and blocks known malware. What the vendors keep for their paid plans is everything around that core. This is what their own feature lists put on the paid side.
A stronger firewall. The Avira Firewall comes with Avira Prime. Avast's pages disagree: its comparison chart marks the advanced firewall as a paid feature, while its free download page and Windows FAQ list a firewall among the free features. Windows already includes Windows Firewall, which Microsoft says is enabled by default on all Windows editions.
An unlimited VPN. Avira's free VPN stops at 500 MB a month on desktop and 100 MB a day on Android. Avast's free tier has no VPN: you need Avast Ultimate or a separate Avast VPN subscription.
Protection against scam texts, calls and webmail. Avast's free version includes Web Guard and the Avast Assistant scam checker; SMS Guard, Call Guard and Email Guard for web-based mail are paid features. Avira keeps email protection on Windows for Prime.
Automatic app updates. Both free tiers include a Windows software updater, but in Avast's free version you update each app by hand with Update now, and Avira lists automatic software updates as a Prime feature.
One plan for several devices. Avast says you download the free app again on each new Windows PC, and that it may ask you to reactivate it after 12 months. Its paid Multi-Device plan covers up to 10 devices; Avira Prime covers 5 or 25.
Fewer sales messages. Avira says its slide-up offers appear only in the free version and can't be disabled. In our test install, Avast's free app showed a Get Premium button and a "Reward" banner offering a "welcome gift".
None of this makes the free version a bad choice. It does mean you should look for the specific gap you care about before you install — and, on Windows, check whether Microsoft's built-in tools already cover it.
How to choose a free antivirus
1
Check what's already protecting you
On Windows, open Windows Security, select Virus & threat protection, then Manage providers under Who's protecting me? to see which antivirus is on. Macs have XProtect built in, and Google Play Protect is on by default on Android.
2
Name the gap you want filled
A free third-party tier is worth installing for something Defender doesn't give you: a small VPN and a password manager (Avira), or web, email and ransomware shields in one free Windows app (Avast). Check the cap before you rely on it.
3
Install one, from the official site
Run one real-time antivirus; Microsoft Defender turns itself off when you install a compatible one. Download from the vendor's own site, skip any "free" offer that asks for a card, then go through the privacy and notification settings.
The free options worth using
3 compared
#1 · Built in
Microsoft Defender Antivirus
Best free antivirus for most Windows PCs
It's already on your PC. Microsoft Defender Antivirus is built into Windows 10 and 11 as part of the Windows Security app, protects the PC from the moment it starts up and gets new threat definitions through Windows Update. Windows also includes a firewall that's on by default, and Microsoft Defender SmartScreen, which warns about known phishing and malware sites and downloads in Microsoft Edge.
Keep Defender if you use Windows and don't need a VPN, a password manager or one app across your phones and Macs.
+Built in and on from startup, with nothing to install
+Windows Firewall and SmartScreen come with it
+Turns itself off when you install a compatible antivirus, so the two don't clash
−Windows only; Microsoft's separate Defender app for other devices comes with Microsoft 365 Personal or Family
−Microsoft describes SmartScreen's site warnings for Microsoft Edge
Windows 11 · Windows 10
2
Avira (Gen Digital)
Most extras in a free tier
Our take: Avira Free Security adds the most around its real-time antivirus: a VPN capped at 500 MB a month on desktop, a password manager, the Browser Safety extension that blocks phishing sites and malicious downloads, and on Windows a software updater and tune-up tools. The catch is what stays in Prime — integrated web and email protection, the Avira Firewall and automatic software updates on Windows — and slide-up offers that Avira says can't be disabled in the free version.
Strengths
Capped free VPN and a password manager included
Browser Safety extension blocks phishing sites, ads and trackers
Free apps for Windows, Mac, Android and iOS
Worth knowing
VPN capped at 500 MB a month on desktop and 100 MB a day on Android
Offers can't be switched off; integrated web and email protection and the Avira Firewall on Windows are Prime features
Platforms:WindowsmacOSAndroidiOS
Bottom line: Pick Avira if you'd use a small free VPN and a password manager, and can live with upgrade offers.
Our take: Avast Free Antivirus puts several protection layers into its free Windows app: File Shield and Behavior Shield for real-time scanning, Web Guard for malicious sites and downloads, Mail Shield for email programs, Ransomware Shield, a Wi-Fi network check and the Avast Assistant scam checker. In our test install the installer opened on a single screen with one Install button and no offers for extra software, but the free Smart Scan reported "10 advanced issues" at a "critical" level on a clean PC — a list that lines up with paid features. Avast's 2024 FTC order over browsing data is covered in our Avast review.
Strengths
Web Guard, Mail Shield and Ransomware Shield in the free Windows app
Avast Assistant checks texts, emails and links for scams
Free apps for Windows, Mac, Android and iOS
Worth knowing
No VPN; scam text and call protection are paid
Upgrade prompts in the free app; a 2024 FTC order over browsing data
Platforms:WindowsmacOSAndroidiOS
Bottom line: Pick Avast if you want web, email and ransomware shields in a free Windows app and don't mind upgrade prompts — and review its privacy settings after installing.
macOS includes XProtect, Apple's built-in, signature-based malware detection and removal. Apple updates its signatures automatically, separately from system updates, and it works alongside Gatekeeper and notarization. If you want a free third-party app as well, Avira and Avast both offer one for Mac.
On a Mac, start with what's built in and add a free app only for a feature you'll use.
+Built in and updates itself
−Scans apps at first launch and apps that have changed
macOS
Built in
Google Play Protect (Android)
Already on most Android phones
Google Play Protect checks apps when you install them and periodically scans your device, including apps from outside Google Play. It can warn you about, deactivate or remove harmful apps, and Google says it's on by default.
Leave Play Protect switched on, whatever else you install.
+On by default; scans apps from other sources too
−Focused on harmful apps
Android
Free versions at a glance
What each free version includes, as the vendor describes it.
Feature
Microsoft Defender Antivirus
Avira
Avast
Real-time protection
Yes, built into Windows
Yes, cloud-based
Yes: File Shield and Behavior Shield
Web and phishing protection
SmartScreen (Microsoft Edge)
Browser Safety extension; integrated web protection in Prime
Web Guard, in the app
Firewall
Windows Firewall, on by default
Avira Firewall is a Prime feature
Avast's pages disagree; its chart marks the advanced firewall as paid
VPN
None listed
500 MB a month on desktop; 100 MB a day on Android
None free; needs Ultimate or Avast VPN
Password manager
None listed in Windows Security
Included
Not stated
Ransomware protection
Controlled folder access, which you configure
Advanced ransomware protection in Prime
Ransomware Shield
Upgrade prompts
Part of Windows; Microsoft promotes a separate Defender app with Microsoft 365
Slide-up offers that can't be disabled
Get Premium button and reward banner (our test install)
Platforms
Windows 10 and 11
Windows · macOS · Android · iOS
Windows · macOS · Android · iOS
Skip it if
You want one app on phones and Macs too
You'd use a VPN every day
You want an app without upsells
Microsoft Defender Antivirus
Real-time protection
Yes, built into Windows
Web and phishing protection
SmartScreen (Microsoft Edge)
Firewall
Windows Firewall, on by default
VPN
None listed
Password manager
None listed in Windows Security
Ransomware protection
Controlled folder access, which you configure
Upgrade prompts
Part of Windows; Microsoft promotes a separate Defender app with Microsoft 365
Platforms
Windows 10 and 11
Skip it if
You want one app on phones and Macs too
Avira
Real-time protection
Yes, cloud-based
Web and phishing protection
Browser Safety extension; integrated web protection in Prime
Firewall
Avira Firewall is a Prime feature
VPN
500 MB a month on desktop; 100 MB a day on Android
Password manager
Included
Ransomware protection
Advanced ransomware protection in Prime
Upgrade prompts
Slide-up offers that can't be disabled
Platforms
Windows · macOS · Android · iOS
Skip it if
You'd use a VPN every day
Avast
Real-time protection
Yes: File Shield and Behavior Shield
Web and phishing protection
Web Guard, in the app
Firewall
Avast's pages disagree; its chart marks the advanced firewall as paid
VPN
None free; needs Ultimate or Avast VPN
Password manager
Not stated
Ransomware protection
Ransomware Shield
Upgrade prompts
Get Premium button and reward banner (our test install)
Search for free antivirus and many of the results are trials. A trial gives you the full paid product for a few days or weeks, then bills you unless you cancel in time — and several ask for a payment method up front. That's a fair way to test a paid suite, but it isn't free protection. Here's what the vendors' own pages say.
Norton: its free tools page offers scans, a password manager app, Norton Private Browser and Safe Search, but its antivirus comes as a 7-day free trial. Norton's offer details say that for trials, a payment method is required at sign-up and will be charged at the end of the trial period unless you cancel first.
McAfee: the page McAfee titles "Free Antivirus" offers a 30-day free trial of McAfee Total Protection. McAfee says you'll need to provide payment details at sign-up, and the page tells you to cancel up to 7 days before the trial ends to avoid being charged.
TotalAV: its free download lets you run a scan and then quarantine or delete threats for free. Real-time protection — the part that blocks threats before they can run — is offered as a trial of its premium service. TotalAV's terms say you may be required to enter billing information for a free trial, and that you won't be charged if you cancel through your account dashboard at least 24 hours before it ends.
VirtualShield: we found no free version. Its help center says it offers a 7-day trial with all of its plans and that you won't be billed if you cancel during the trial, but its pricing page currently mentions only a money-back guarantee, so check the terms before you sign up.
Avast: for trials of its paid tiers where a payment method is required, the paid subscription starts automatically when the trial ends unless you cancel.
System Mechanic: iolo's "System Mechanic Free" is a 30-day trial of its PC tune-up software, and antivirus isn't on its feature list.
If you do start a trial, put its end date in your calendar the day you sign up.
Before you settle on a free antivirus
It gives you real-time protection for free, not just a scan: TotalAV's free download scans and removes threats, but its real-time protection is a trial.
Nothing asks for a payment method. If it does, it's a trial that bills you when it ends unless you cancel.
You know the limits: Avira's free VPN stops at 500 MB a month on desktop, and Avast's free tier has no VPN at all.
You've looked up how well it protects. We don't run a malware lab; AV-TEST and AV-Comparatives publish independent results. Check that the result you read is for the edition you'll install, free or paid.
You've been through the privacy settings. In Avast they're under Menu > Settings > General > Personal Privacy, where you untick what you don't want to share.
On Windows 10, you also have a plan for system updates. Microsoft says antivirus isn't enough without them, so enroll an eligible PC in the consumer Extended Security Updates program, which runs through October 12, 2027, or move to Windows 11.
After you uninstall any antivirus, open Who's protecting me? in Windows Security to confirm which one is on.
For most Windows PCs, the one that's already installed: Microsoft Defender Antivirus, built into Windows 10 and 11. If you want free extras, Avira Free Security adds a capped VPN and a password manager, and Avast Free Antivirus adds web, email and ransomware shields in its free Windows app. Both show upgrade prompts.
Is Microsoft Defender really free?
Yes. Microsoft Defender Antivirus is part of the Windows Security app built into Windows 10 and 11, and it updates through Windows Update. Don't confuse it with the separate Microsoft Defender app, which Microsoft includes with Microsoft 365 Personal and Family subscriptions and which covers Windows, Mac, iOS and Android.
Can I run a free antivirus alongside Microsoft Defender?
You don't have to manage that yourself. Microsoft says Defender Antivirus turns itself off automatically when you install a compatible non-Microsoft antivirus, so only one does the real-time work. Avast also has a Passive Mode that switches off its own shields so it can sit next to another antivirus, but Avast says it then doesn't actively protect you.
Is free antivirus enough on Windows 10?
Not on its own. Windows 10 support ended on October 14, 2025. Microsoft says it will keep sending security intelligence updates for Defender through October 2028, but that Windows 10 devices will be more vulnerable even with them, and that antivirus alone isn't enough without operating system security updates. Microsoft's consumer Extended Security Updates program gives eligible personal-use Windows 10 PCs on version 22H2 critical and important security updates through October 12, 2027.
Is there a free antivirus for Mac, iPhone or Android?
Macs have XProtect built in, and Avira and Avast both offer free Mac apps. On Android, Google Play Protect is on by default; Avira's free Android app adds a VPN with 100 MB of data a day, and Avast's free phone app is now Avast One, with Web Guard and the Avast Assistant. Avira's free iOS app includes a VPN. For iPhones, see our guide on whether they need antivirus.
Are Norton and McAfee free?
Not their antivirus. Norton offers a 7-day free trial and McAfee a 30-day one, and both say you give payment details at sign-up and are charged when the trial ends unless you cancel. Norton does have free tools, such as a password manager app and a private browser.
Why does my free antivirus say it found critical issues?
It may be an upgrade pitch rather than a detection. In our test install of Avast Free Antivirus on a clean PC, the first Smart Scan found no malware but reported "10 advanced issues" at a "critical" level. With the Premium trial on, the same step read "All resolved", so the list lines up with paid features; it isn't evidence that Avast found those problems on the PC.
We use necessary cookies to run the site. With your consent we also use analytics to improve our reviews and measure which ads lead to a purchase. You can accept, reject, or choose categories. See our Cookie Policy.
