8 Free Antivirus Apps That Actually Protect You Without Selling Your Data (2026)

Most “best free antivirus” lists rank apps by one thing: how many viruses they catch in a lab test. That number matters, but it hides the real cost of “free” software. Free antivirus companies still need to make money somehow. Some do it through upsells. Some do it through bundled toolbars. A few have done it by selling your browsing history to data brokers — Avast and AVG paid the FTC $16.5 million in 2024 for exactly that, after years of collecting and reselling user data through a subsidiary called Jumpshot. So instead of only testing detection rates, we dug into the privacy policies, data-collection defaults, and business models behind eight popular free antivirus apps. Here’s what actually happens to your data when you install each one.

How We Picked and Tested These Apps

We looked at three things for every app on this list:

1. What data it collects by default, and whether that’s opt-in or opt-out.
2. Whether the company has a history of selling or sharing user data with advertisers or brokers.
3. Independent lab scores from AV-Test and AV-Comparatives, so “private” doesn’t mean “weak.”

We excluded apps with no recent, verifiable lab results, and we skipped anything bundled with adware installers. Below, we also flag where a company’s free tier funds itself through your data, not just your patience with pop-ups.

1. Microsoft Defender — Best for Not Sending Your Data Anywhere New

Microsoft Defender ships free with every copy of Windows. It runs automatically, needs no account, and has no upsell screen, because Microsoft already makes its money from Windows itself. Its lab scores have caught up with paid competitors. AV-Test gave Defender a near-perfect score in June 2026. Its biggest downside is offline detection: when your PC can’t reach Microsoft’s cloud, protection drops noticeably. Privacy note: Defender data stays inside Microsoft’s existing Windows telemetry system. It doesn’t introduce a new third party into the picture, which is the main reason privacy-focused reviewers keep recommending it.

2. Bitdefender Antivirus Free – The Best Cybersecurity Option

Bitdefender’s free tier is deliberately bare. There’s no dashboard full of upsell banners, no bundled VPN nagging you to upgrade. It just scans, blocks, and stays quiet. That simplicity extends to its data practices. Bitdefender collects threat-sample data to improve detection, but it doesn’t run an advertising or data-resale business the way some competitors do. You lose granular control over scan settings, but most home users won’t notice.

3. Malwarebytes Free — Best for Minimal Background Activity

Malwarebytes Free doesn’t run continuously in the background at all. That makes it the lightest option on this list, and also the one with the smallest attack surface for data collection, since it isn’t watching your traffic in real time. The trade-off: without real-time protection, it works best as a second opinion alongside Defender or Bitdefender, not as your only line of defense.

4. Sophos Home Free — Best for Non-Technical Users Who Want Simplicity

Sophos built its name on enterprise security, and its free consumer tier inherits that same no-nonsense approach. The interface stays simple, and the company’s revenue comes from business security contracts, not consumer data. Sophos Home Free protects up to three devices and includes basic real-time scanning. It won’t match Bitdefender’s polish, but it’s a solid pick if you want a company whose main business isn’t built around consumer ad targeting.

5. Avira Free Security — Best Balance of Features and Transparency

Avira’s free plan bundles antivirus with a basic VPN and a software updater. Detection rates sit close to the paid competition, and the company publishes a clear breakdown of what data it collects for threat analysis. Like most free tools, Avira uses its free tier to funnel users toward paid upgrades. That’s a business model built on conversion, not data resale, which puts it in safer territory than apps with a history of selling browsing data.

6. Kaspersky Free — Strong Detection, but Check Your Local Rules First

Kaspersky consistently scores near the top on independent malware tests. The company completed a move of its core data-processing infrastructure to Switzerland back in 2023, partly to address concerns about its Russian origins. That history still matters. Several governments, including the US, restrict or ban Kaspersky products for government and critical-infrastructure use. For personal, non-sensitive use, most independent researchers see no evidence of misuse. If you handle government, corporate, or otherwise sensitive data, pick a different app on this list instead.

7. Avast Free Antivirus — Feature-Rich, but Read the Fine Print

Avast Free packs in real-time protection, a web shield, an email scanner, and a Wi-Fi inspector, more tools than most free competitors offer. Detection rates hover around 99.7% in independent tests. Here’s the part most “best of” lists skip: Avast and its subsidiary AVG collected and sold user browsing data through a service called Jumpshot from 2014 to 2020. The FTC fined Avast $16.5 million in 2024 over the practice, and Avast shut Jumpshot down in 2020. The company has since rewritten its privacy policy to state it doesn’t share data with third-party advertisers, and its “improvement program” data sharing is now disclosed rather than hidden. Even so, that data-collection toggle is still enabled by default in the free version, so we recommend opening Settings and reviewing it yourself after installation.

8. AVG AntiVirus Free — Same Engine as Avast, More Selling

AVG shares its detection engine with Avast (the two companies merged in 2016), so malware protection is nearly identical. Where AVG differs is in how aggressively it pushes extras: more upgrade prompts, more bundled tools, more opportunities to opt into data sharing during setup. AVG was named alongside Avast in the same FTC data-selling case. Its current privacy policy discloses data categories clearly and offers a Global Privacy Control opt-out signal, which is a genuine improvement. If you choose AVG, go through every setup screen carefully anddecline anythingyou don’t recognize.

Free Antivirus Comparison at a Glance

Red Flags to Watch For in Any “Free” Security App

Before you install anything not on this list, run it through a quick checklist: No published privacy policy, or one that’s vague about data sharing. Walk away. No recent AV-Test or AV-Comparatives score. An untested antivirus is a guess, not protection. Data collection enabled by default with no visible opt-out. Legitimate free tools let you turn this off in settings. A parent company with a history of selling user data. Past behavior is the best predictor you have. Aggressive bundling of unrelated software during install. That’s usually how the “free” tier gets funded.

Frequently Asked Questions

Is free antivirus safe to use in 2026? Yes, for most home users. Independent lab tests show several free tools now match paid products on malware detection. The bigger risk isn’t weak protection, it’s unclear data practices, so check the privacy policy before you install. Do I need antivirus if I already use Windows Defender? For most people, no. Defender’s detection scores now compete with paid suites. Add a second on-demand scanner like Malwarebytes if you want a periodic second opinion. Does free antivirus slow down my computer? Some do. Avast and AVG carry more background processes than lighter tools like Bitdefender or Malwarebytes. If you’re on older hardware, pick the lighter option. Can antivirus protect me on public Wi-Fi? No. Antivirus blocks malware, not network snooping. Pair it with a VPN if you regularly connect to public networks.