Best Antivirus With No Data Collection in 2026

If you're reading this, something probably just made you angry. Maybe you found out Norton collects your browsing habits. Maybe you read that Avast sold data from 100 million users to advertisers. Maybe your antivirus asked you to "opt in to product improvement" and you finally asked what that actually means.

Whatever brought you here — you're right to be concerned. Most antivirus software collects data about you, your files, your browsing, and your device. Some of it gets sold. Some gets "anonymized" (which doesn't mean what you think it means). And almost all of it is unnecessary for the actual job of scanning files for malware.

Here are the antivirus options in 2026 that verifiably collect zero data, ranked by usability.

Why your antivirus collects data in the first place

The standard industry justification is "threat intelligence." The argument goes: if we can see what threats our users encounter, we can build better detection. If we can analyze suspicious files in the cloud, we can identify zero-days faster. If we track browsing patterns, we can block phishing sites before users reach them.

Some of that is true. Cloud-based analysis does catch some threats faster than local-only scanning.

But here's what the industry doesn't say out loud: data collection is also a revenue stream. A big one.

• Avast operated a subsidiary called Jumpshot that packaged browsing data from 100 million users and sold it to Google, Microsoft, Pepsi, McKinsey, and Omnicom. The FTC fined them $16.5 million in February 2024 and banned them from selling browsing data for advertising. Jumpshot's pitch to buyers was: "Every search. Every click. Every buy. On every site."
• Norton bundled a cryptocurrency miner in 2022. When your computer sat idle, Norton used your CPU and electricity to mine Ethereum, keeping a 15% cut. The same miner was deployed to Avira's 500 million users. Both brands are owned by Gen Digital.
• McAfee's privacy notice discloses sharing data with "trusted third parties" for "interest-based advertising." Their WebAdvisor collects URLs, search queries, device identifiers, and IP addresses.

The antivirus industry made $4.5 billion in revenue in 2024 (Statista). Not all of that came from subscriptions.

The "anonymized data" problem

When privacy policies say "we collect anonymized data," most people assume that means the data can't be traced back to them. That assumption is wrong.

A 2019 study by researchers at Imperial College London and Universite Catholique de Louvain found that 99.98% of Americans could be re-identified in any anonymized dataset using just 15 demographic attributes. The researchers used publicly available census data to demonstrate that "anonymization" as practiced by most companies is essentially meaningless.

When your antivirus collects "anonymized" browsing data that includes timestamps, URLs, device type, OS version, screen resolution, and timezone — that's more than 15 attributes. You're identifiable.

Ranked: antivirus with zero data collection

1. XorShield AV — best for most people

Price: $14.99/year (3 devices)
Platforms: macOS, Windows, Linux
Engine: 5-layer local detection stack (AI + signatures + pattern matching + smart file recognition + optional threat intelligence)
Data collected: None
Account required: No

XorShield is engineered as a multi-layer protection platform with AI pre-screening, signature intelligence, pattern detection, smart file recognition, and optional threat intelligence. Privacy and detection claims are designed to be technically verifiable, which is the point of this ranking.

Core protection runs locally with no telemetry, no analytics beacons, no cloud file uploads, no account creation, and no email capture. In standard operation, files stay on-device.

The detection architecture combines multiple engines and methods: smart file recognition to skip known-safe files, AI pre-screening for rapid risk scoring, a known-threat signature database drawn from trusted open threat-intelligence feeds, pattern matching for obfuscated and variant malware, and optional fingerprint-only threat intelligence lookups under user control.

If you're searching for a ClamAV alternative with a modern desktop experience, XorShield is the direct upgrade path: a full local-first engine with AI-assisted detection, behavior/pattern analysis, real-time monitoring, and quarantine workflows in one product.

In addition to malware detection, XorShield delivers the complete desktop security experience: real-time monitoring, drag-and-drop scanning, quarantine workflows, scheduled scans, and native notifications across Linux, macOS, and Windows.

How to verify: install Little Snitch (macOS) or GlassWire (Windows) and watch the traffic. You'll see connections to a single signature update server and nothing else.

2. ClamAV (command line) — best for technical users

Price: Free
Platforms: macOS, Windows, Linux, BSD
Engine: ClamAV
Data collected: None
Account required: No

ClamAV is a long-standing open-source engine that several products are built on. You can use it directly from the terminal. It's free, fully open source, and collects absolutely nothing.

# Install on macOS
brew install clamav

# Update signatures
freshclam

# Scan a directory
clamscan -r ~/Downloads

The downside is obvious: no GUI, no real-time monitoring (without manual configuration), no drag-and-drop, no quarantine UI, no notifications. You have to know what you're doing. Setting up real-time scanning requires configuring clamd, fswatch, and launch daemons — doable, but not for everyone.

If you're comfortable in the terminal and you want maximum transparency at zero cost, this is the purest option.

3. ClamXAV — best for Mac-only users who want a GUI (with caveats)

Price: paid annual licence (check their site for current pricing)
Platforms: macOS only
Engine: ClamAV
Data collected: Minimal — some telemetry
Account required: No (but registration for license)

ClamXAV is a well-made macOS app built on ClamAV. It's been around since 2005 and the developers have a clean track record.

The caveat: ClamXAV collects some data. Their privacy policy mentions "anonymous usage statistics" and crash reports that may include system configuration information. You can opt out of some of this, but not all of it. It's minor compared to Norton or Avast — but it's not zero.

For that reason, it doesn't fully belong on a "no data collection" list. It's included because it's the closest alternative on macOS, and being explicit about its limitations is more useful than pretending it doesn't exist.

If you want a mainstream option: ESET and Microsoft Defender

Zero data collection is a narrow list. If you'd rather have a big-name product with real-time cloud analysis, two options are worth knowing about, because both document what they collect and both let you turn parts of it off.

ESET — clearest controls of the mainstream products

ESET is based in Slovakia, which puts it inside the EU and under GDPR by default rather than as a regional adjustment.

Its cloud system is called LiveGrid, and it comes in two parts. According to ESET's own support documentation, the reputation system provides cloud-based allow and block lists you can query for running files. The feedback system goes further: when a new threat is detected it can send a sample or copy of the file, the file path, the filename, the date and time, the process the threat arrived through, and information about your operating system, along with crash reports and related statistics, to ESET's research lab.

That's a real amount of data, and ESET states it plainly rather than burying it. Both parts are enabled if you install with default settings, and both can be turned off in the application's settings. ESET also notes that if you had LiveGrid enabled and then disable it, any packages already queued will still be sent.

Worth knowing: ESET discontinued its Linux desktop product, so this applies to Windows and macOS. See our vendor-by-vendor Linux check for where that leaves Linux users.

Microsoft Defender — good protection, inseparable from Windows

Defender is already on your Windows PC, it's free, and it doesn't nag you or bundle extras. For malware protection alone, it's a solid default.

The privacy picture is more tangled. Microsoft's cloud protection documentation explains that when the local engine can't reach a clear verdict, it sends file metadata to Microsoft's cloud. Its own examples include OS version, security settings, process and parent process, download IP and URL, hashed file paths, connection IPs, locale and geographic location. Microsoft says filenames are hashed and personal data isn't included.

On top of that, the default sample submission setting uploads file types considered unlikely to hold personal data automatically, and prompts you for ones that might. And metadata for detections is still sent even when sample submission is switched off.

Defender also can't be separated from Windows diagnostic data, which you can reduce but not fully disable on Home and Pro editions. We cover every relevant toggle in Is Windows Defender enough?

How to verify any antivirus's privacy claims

Don't take any company's word for it. Here's how to verify the claims directly.

Step 1: Run a network monitor

Install a network monitoring tool before you install the antivirus. On macOS, Little Snitch is the long-standing choice. On Windows, GlassWire (free tier available) works well. On Linux, use tcpdump or Wireshark.

After installing the antivirus, watch outbound connections for 24 hours. You should see:

• Signature update servers (expected and necessary)
• Nothing else (if the product claims zero data collection)

If you see connections to analytics endpoints, ad networks, telemetry servers, or any domain that isn't the signature update server — that's data collection, regardless of what the privacy policy claims.

Step 2: Read the privacy policy — the real one

Not the "privacy overview" or "our commitment to privacy" marketing page. The legal privacy notice. Search for these terms:

• "Third party" — who gets your data
• "Advertising" or "marketing" — data monetization
• "Anonymized" or "de-identified" — data that's collected but supposedly can't identify you (it usually can)
• "Product improvement" — a catch-all that can mean anything
• "May collect" or "may share" — hedging language that gives them permission without commitment

If any of those terms appear, data is being collected. The question is how much and what happens to it.

Step 3: Check whether scanning stays on your device

The biggest privacy risk is an engine that uploads your files — or metadata about them — to a cloud for analysis. Watch the network traffic during a scan: if files or hashes are leaving your machine when you haven't asked for a cloud lookup, that's the problem.

An open-source engine is a bonus here, because researchers can confirm what it does internally. ClamAV, for instance, has been public for 24 years — audited by security researchers, governments, and enterprises. But you don't need the source to catch the worst behavior: the network is observable, and a tool that keeps your files local will show it.

Step 4: Check whether an account is required

An antivirus that requires you to create an account before scanning your own files is collecting data by definition. Your email address, your device, and your usage are now linked to an identity. That identity persists across sessions, updates, and reinstalls.

Ask: why does a file scanner need to know my email address? The answer is never technical. It's business.

What you give up without cloud analysis

There is a real trade-off worth stating clearly: antivirus products that collect data can gain faster zero-day response in some cases. When Norton sees an unknown file, it can send a hash or sample to its cloud, compare it against machine learning models, and return a verdict in seconds.

Local-signature products rely on a signature being published for a new threat. That process is fast — often within hours of a new threat being identified — but there's a window.

For most threats people actually encounter (known malware families, adware, trojanized downloads, phishing attachments), the signature database catches them. The gap is on truly novel, targeted attacks. If you're a high-value target, that gap matters. For most people, it doesn't.

The trade-off is real. But so is the trade-off on the other side: you're giving a company with root access to your computer the ability to see and transmit data about your files, your behavior, and your identity. Only you can decide which risk matters more.

The bottom line

In 2026, there are exactly three antivirus options that verifiably collect zero user data: XorShield AV, ClamAV from the command line, and — with some caveats — ClamXAV with telemetry toggles set to off. ClamAV and ClamXAV share the same open-source engine; XorShield runs its own multi-layered engine. What they have in common is the thing that matters here: your files and your activity stay on your device.

Everything else collects something. Some collect a little. Some collect everything and sell it to advertisers. The privacy policy tells you which is which — if you read the legal document, not the marketing page.

Your antivirus has the same access to your system that malware does. Choose accordingly.

Last updated: September 2026