Most New Zealand computers do not need paid antivirus to stay safe. Windows ships with Microsoft Defender, Macs and Android phones have their own built-in protection, and independent laboratories now rate the best free products almost as highly as the paid ones. The real catch with free antivirus is rarely detection — it is upselling, missing extras and, in one well-known case, what the maker did with users’ data.
Key points
- Free is now competitive: Microsoft Defender, Avast Free and AVG Free all score at or near the top of independent 2026 tests.
- Defender is the easy default on Windows: it is built in, self-updating and never upsells — just switch on Controlled Folder Access for ransomware cover.
- The catch is trust and extras, not detection: the FTC fined Avast US.5m over browsing data, and free versions push upgrades and bundled tools.
- Macs, Android and iPhones ship with their own protection, so third-party antivirus is optional on those devices.
- Pay only for a reason: multiple family devices, parental controls, phone support, or a high-risk user in the house.
How the free options score in 2026
| Product | AV-TEST, June 2026 (protection / performance / usability, out of 6) | AV-Comparatives Real-World, Feb–May 2026 |
|---|---|---|
| Microsoft Defender (built into Windows) | 6 / 5.5 / 6 | 99.0% blocked, zero false positives |
| Avast Free Antivirus | 6 / 6 / 6 | 99.3% blocked |
| AVG AntiVirus Free | 6 / 6 / 6 | 99.3% blocked |
These figures come from the independent testing labs AV-TEST and AV-Comparatives, which score security products on how well they block real threats without flagging safe files. For comparison, the paid suites at the top of the same tests — Kaspersky at about 99.8% and Bitdefender at about 99.5% — are only fractionally ahead. The gap between good free protection and good paid protection is now small enough that the choice turns on features and trust rather than detection rates.
Microsoft Defender is the default for a reason
Defender is already on every Windows 10 and 11 computer, updates through Windows Update, never nags you to upgrade and posted a perfect false-positive record in the latest real-world test. For most households it is the sensible free choice, and switching it off to install another free product rarely improves protection. One setting is worth changing: Controlled Folder Access, Defender’s ransomware protection (ransomware is malware that locks your files and demands payment), is off by default and can be switched on under Virus & threat protection. Our Windows Defender review looks at the product in more depth.
What free antivirus leaves out
| Usually missing from free versions | Does it matter? |
|---|---|
| Advanced ransomware and webcam protection | Useful on work machines; Defender’s Controlled Folder Access covers ransomware if you switch it on |
| Password manager | A free standalone manager such as Bitwarden does this better |
| VPN | Free antivirus VPNs are heavily limited; a proper VPN is a separate decision |
| Parental controls | Windows, Android and Apple devices include their own family controls |
| Identity and dark-web monitoring | Have I Been Pwned offers breach alerts for free |
| Phone support | Matters most for less confident users |
The trust question
Free products have to make money somehow. The clearest warning is Avast: in February 2024 the United States Federal Trade Commission ordered it to pay US$16.5 million over browsing data collected by its software and sold through its former Jumpshot subsidiary. In December 2025 the FTC began sending about US$15.3 million in refunds to 103,152 affected customers. Avast, AVG, Avira and Norton are all owned by the same company, Gen Digital. The software itself tests well; read the privacy settings during installation and switch off anything you do not want shared.
The other cost is your attention. Free versions regularly prompt you to upgrade, bundle browser extensions and offer “PC tune-up” tools you do not need. Decline the extras during setup.
Free protection on other devices
- Mac: macOS includes Gatekeeper, notarisation and XProtect, which checks apps as they open and removes known malware. Careful users who install only from the App Store and identified developers are well covered — Apple explains how this works.
- Android: Google Play Protect scans apps from the Play Store and on the device. Most Android malware arrives through apps installed from outside the store — our Android malware guide explains how to remove it.
- iPhone and iPad: the app sandbox and App Store review make traditional antivirus unnecessary. Keep iOS updated.
Setup checklist
- Leave Microsoft Defender switched on rather than replacing it — don’t run two real-time scanners at once.
- Turn on Controlled Folder Access under Virus & threat protection for ransomware protection.
- Keep automatic Windows and app updates enabled.
- During any free-antivirus install, decline bundled browser extensions and “PC tune-up” tools, and switch off data sharing.
- Use unique passwords with two-factor authentication, ideally through a dedicated password manager.
- Ignore unexpected “your subscription has renewed” emails — verify directly with the vendor.
When paying makes sense
A paid suite is worth considering if you want one subscription covering several family devices with parental controls, if someone in the house regularly downloads software from wherever search results lead, or if you want phone support. Our antivirus comparison for New Zealand sets out the paid options and their renewal prices, and the Norton 360 guide looks at the best-known suite in detail.
Whatever you choose, the habits matter more than the product: keep automatic updates on, use unique passwords with two-factor authentication, and be suspicious of unexpected attachments and “your subscription has renewed” emails — a common scam that impersonates antivirus companies, which our guide to antivirus renewal scams shows in detail. New Zealand’s National Cyber Security Centre sets out the basics in its five quick steps to online security.
Disclaimer: This guide is general information, not personalised security advice. Independent laboratory results change with every test round; the figures here are from AV-TEST (June 2026, Windows 11) and AV-Comparatives (Real-World Protection Test, February–May 2026). If you think a device has been compromised, contact the NCSC on 0800 114 115.
Sources
- AV-TEST — Antivirus tests for Windows home users
- AV-Comparatives — Real-World Protection Test, February–May 2026
- US Federal Trade Commission — Avast order (February 2024)
- US Federal Trade Commission — Avast settlement refunds
- Apple — Protecting against malware in macOS
- Own Your Online (NCSC) — Five quick steps to online security
Frequently asked questions
What is the best free antivirus in NZ?
For Windows, Microsoft Defender is the sensible default: it is built in, scores highly in independent tests and never upsells. Avast Free and AVG Free also test well if you want an alternative.
Is Windows Defender good enough in 2026?
For most people, yes. It scored 6, 5.5 and 6 out of 6 with AV-TEST in June 2026 and blocked 99% of threats with no false positives in AV-Comparatives’ latest real-world test.
Is free antivirus safe to use?
The protection is generally solid, but read the privacy settings. In 2024 the US Federal Trade Commission ordered Avast to pay US$16.5 million over browsing data collected and sold through a former subsidiary, so it pays to switch off any data sharing during setup.
Do I need antivirus on a Mac?
Not usually. macOS includes XProtect, Gatekeeper and notarisation. Extra protection helps mainly on shared machines or where software comes from unofficial sources.
Should I run two antivirus programs?
No. Two real-time scanners conflict and slow the computer down. Installing another product switches Defender’s real-time protection off automatically anyway.
When is paid antivirus worth it?
When you want one subscription across several devices with parental controls and support, or when someone in the house regularly installs software from unofficial sources.
