Most New Zealand computers do not need paid antivirus to be 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 catch with free antivirus is rarely detection — it is upselling, missing extras and, in one well-known case, what the company did with users’ data.
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 |
For comparison, the paid suites at the top of the same tests — Kaspersky at 99.8% and Bitdefender at 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 scored 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, 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 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, and about US$15.3 million was refunded to 103,152 people in December 2025. 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 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 installing from the App Store and identified developers are well covered.
- 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.
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. Our guide to antivirus renewal scams shows what they look like, and the malware explainer covers the threats antivirus is designed to catch.
Disclaimer
General information only. Test results are from AV-TEST (June 2026, Windows 11) and AV-Comparatives (Real-World Protection Test, February–May 2026); results change with each test round. If you suspect a device has been compromised, report it to the NCSC on 0800 114 115.
Reference 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.
Do I need antivirus on a Mac?
Not usually. macOS includes XProtect, Gatekeeper and notarisation. Extra protection helps 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. Installing another product switches Defender’s real-time protection off automatically.
When is paid antivirus worth it?
When you want one subscription across several devices with parental controls and support, or someone in the house regularly installs software from unofficial sources.
