VPN vs. traditional antivirus: Differences, uses, and whether you need both

What is a traditional antivirus?

A traditional antivirus (AV) is a program that detects, blocks, and removes malware — software designed to damage, steal from, or gain unauthorized access to your system. Despite the name, a traditional antivirus protects against far more threats than just viruses.

How does a traditional antivirus work?

Traditional antivirus software identifies threats in two main ways: signature-based detection, which matches files against a database of known malware, and heuristic detection, which flags suspicious behavior to block new, unknown threats.

Both methods operate at the device level. The software continuously scans files and processes on your device, and quarantines or removes the ones that match a known threat or show suspicious behavior. It acts after a threat has reached your device — not before.

What does a traditional antivirus protect you from?

Traditional antivirus software protects your device from malware. The most common types of malware include:

• Trojans, which allow attackers to steal your data, install additional malware, or take control of your device.
• Ransomware, which locks your files and demands payment to restore access.
• Worms, which replicate and spread across networks automatically, corrupt data and deliver additional malware.
• Adware, which floods your device with unwanted ads.
• Spyware, which collects your sensitive data — including passwords and browsing activity — without your knowledge.

What doesn’t a traditional antivirus protect you from?

Traditional antivirus software protects your device but not your connection. Because of this limitation:

• Hackers can eavesdrop on public Wi-Fi. Traditional antivirus software doesn’t secure your internet traffic against attackers on the same network.
• Websites can expose your IP address and location. An AV doesn’t mask your physical location from the websites you visit.
• Your internet service provider (ISP) can run surveillance. A virus scanner doesn’t encrypt your connection to keep your internet activity private from your ISP.
• Advertisers can track your behavior. A traditional antivirus doesn’t block third-party trackers from recording your browsing habits.

Cybercriminals can launch man-in-the-middle (MITM) attacks. Security software focuses on your local files and doesn’t stop attackers from intercepting your network connection.

What is a VPN?

A VPN, or virtual private network, encrypts your internet traffic and routes it through a secure server before it reaches its destination. That process masks your IP address and prevents anyone monitoring your connection — including your ISP, advertisers, or attackers on a public network — from seeing what you do online. Strong VPN encryption makes it extremely difficult for anyone without the cryptographic key to read the traffic inside the VPN tunnel.

How does a VPN work?

The VPN app on your device encrypts your traffic before it leaves your device. The encrypted data then travels through a secure tunnel to a VPN server, which decrypts it and forwards your request to the destination website. When the website sends data back, the VPN server encrypts the response and sends it back through the encrypted tunnel. The VPN app on your device then decrypts it.

Throughout the process, the destination website sees the VPN server’s IP address, not yours. The VPN operates entirely at the connection level — it never touches your files or software.

What does a VPN protect you from?

A VPN protects you at the network layer, where your data moves between your device and the internet. It stops:

• Eavesdropping on public Wi-Fi. A VPN can help protect you from hackers and snoopers on shared networks because the contents of your traffic are encrypted, so others on the same Wi-Fi can’t easily read what you’re sending or receiving.
• ISP tracking. Your provider can’t see the content of your traffic or the sites you visit.
• Advertiser and data broker tracking. Masking your IP limits how easily trackers can build a profile on you.
• Man-in-the-middle attacks. Attackers who intercept your connection can’t read encrypted data.
• IP-based identification. Websites and services see the VPN server’s IP, not your real one.

What doesn’t a VPN protect you from?

A VPN secures your connection, not your device. That means it won’t:

• Remove malicious software already on your device. If your device is already infected, a VPN can’t help — it has no access to your files or processes.
• Scan downloaded files for viruses. A file containing malicious code will still execute after download.
• Block ransomware or spyware. Once a threat reaches your device, a VPN has no mechanism to stop it.

VPN vs. antivirus: What’s the difference between a VPN and a traditional antivirus?

A VPN and a traditional antivirus protect you in different ways. Think of a traditional antivirus as the alarm inside your house and the security team that responds when the alarm sounds. A VPN works like a sealed envelope — your traffic reaches its destination, but nobody along the way can see what’s inside.

Both tools matter, but they solve different problems. Understanding what each one does helps you decide whether you need one or both.

* A VPN reduces MITM risk by encrypting traffic through a secure tunnel, which makes it harder for attackers on the same network to intercept your data. Some VPNs, including NordVPN, add a further layer of protection by verifying SSL certificates when communicating with their own backend services — stopping requests if an unauthorized certificate is detected. A VPN doesn’t replace HTTPS, certificate validation on other services, or safe browsing habits.

** Usually minor. A slowdown is more likely if web filtering, HTTPS inspection, or download scanning is enabled.

*** A VPN can slightly affect device performance because it uses CPU, memory, and battery for encryption. Antivirus software may slow down your device during scans, updates, or real-time file checks.

Does a VPN protect you from viruses?

No, a VPN can’t protect you from viruses. Its primary purpose is securing your connection, not scanning your device. Because it operates at the network layer, a VPN never touches your files. When you download a file, a VPN encrypts the connection it travels over but doesn’t scan the file’s contents.

Some VPN services offer malware protection as an extra feature. The feature blocks malicious download sources before a file reaches your device, which reduces the risk of a virus infection. But this add-on isn’t standard across VPN providers — coverage varies.

Blocking a download source isn’t the same as removing a virus already on your device. It’s an extra layer of defense, not a replacement for dedicated antivirus software. 

Do you need a VPN, a traditional antivirus, or both?

You would benefit from both a VPN and a traditional antivirus, and the reason is straightforward. A VPN and a legacy antivirus protect two completely different surfaces. A VPN can’t scan files, and a traditional antivirus can’t encrypt your connection. Running only one leaves an entire layer of either your device or your internet security unprotected.

How to choose a traditional antivirus 

Not all AV software is equally trustworthy. When evaluating options, prioritize:

• Real-time scanning. Quality antivirus tools should monitor activity continuously, not just when you run a manual scan.
• Independent test lab scores. Check results from AV-TEST and AV-Comparatives, the two leading independent certification labs. Don’t rely solely on vendor-reported claims.
• A clear data policy. Check what data the antivirus provider collects and whether it sells or shares it. 

• A privacy policy backed by an independent audit. Self-reported claims aren’t enough.
• Minimal performance impact. Reliable antivirus programs shouldn’t noticeably slow your device during everyday tasks.

How to choose a VPN

The criteria for a trustworthy VPN are specific. Look for:

• A no-logs policy backed by an independent audit. Self-reported no-logs claims don’t mean much without a third-party audit to support them.
• Strong, audited VPN encryption. AES-256-GCM (used with OpenVPN and IKEv2/IPsec) and ChaCha20-Poly1305 (used with WireGuard-based protocols like NordLynx, NordVPN’s proprietary implementation of the WireGuard® protocol) are the current standards.
• Acceptable speed impact. Some speed loss is normal due to encryption overhead, but premium VPNs keep it minimal — speed impact matters more for streaming and gaming.
• Number of devices covered. A VPN that only covers one or two devices won’t suit most households running phones, laptops, and tablets across multiple users.
• Built-in threat protection. Check whether your provider offers threat protection features.

Consider a solution that includes both a VPN and online threat protection

Before paying for two separate subscriptions, ask whether the tools need to be separate at all. A growing number of VPN providers now bundle threat protection into their core apps, which adds a layer of device-level security on top of the connection protection a VPN already provides.

That kind of built-in protection isn’t a full replacement for dedicated antivirus software, but it can reduce the number of tools you manage without leaving your connection unprotected. NordVPN is one example of a provider that has taken this approach. 

NordVPN offers an independently audited, industry-leading VPN alongside a built-in next-gen antivirus — a digital protection tool that stops scams, malicious sites, and phishing attacks, blocks trackers and intrusive ads, and scans downloads for malware. So if you’re already running a VPN, check whether your provider includes genuine threat protection as part of the package.

Why managing two tools separately adds friction

Managing two separate security tools creates friction that’s easy to underestimate: two subscriptions, two dashboards, two renewals, and two different support contacts when the two tools conflict.

Technical overlap — like both tools flagging the same malicious URL — isn’t typically dangerous, but it produces duplicate alerts. Seeing two warnings for the same event erodes trust in both tools and creates enough confusion that users start dismissing alerts without reading them. That habit is a security risk.

The average US household already juggles multiple software subscriptions across streaming, storage, and productivity tools. According to a 2025 Bango report, 41% of subscribers are frustrated that they can’t manage all their subscriptions in one place, and 62% say they’d rather have a bundle than sign up for individual services.²

Adding two competing security apps to an already crowded stack — each with its own update cycle and settings — can lead people to leave one inactive. Some VPNs now include built-in malware protection that reduces that friction, though it’s worth confirming the level of malware coverage before replacing a dedicated antivirus entirely.

What the best combined protection actually does

If you decide to consolidate your digital security with a single tool, treat the following as a checklist — any product you evaluate should meet all of these criteria, not just some:

• Coverage at both the network and device layer. Look for connection encryption and real-time malware scanning.
• Threat interception before download. A traditional antivirus catches malware after it lands. A strong combined solution blocks malicious sites, known phishing domains, and infected files in transit before they execute.
• A confirmed no-data-collection policy. A vendor with access to both your connection and your files has significant visibility into your data. Third-party audits — not vendor-issued statements — are a must. NordVPN’s no-logs policy has been independently audited six times, most recently by Deloitte Lithuania in 2025.
• Third-party test results for the malware protection layer. Independent lab scores from AV-TEST and AV-Comparatives confirm whether the threat protection is genuine. Look for publicly available scores. NordVPN has earned AV-TEST certification and the highest AAA anti-malware rating in West Coast Labs’ anti-malware validation test, with a 99.8% detection rate for high-threat malware among VPNs offering comparable functionality. Both certifications are publicly available.^
• One app, one subscription, multiple devices. A combined solution should genuinely consolidate your security stack, not bundle two separate apps under a single price.

The table below shows how three tools — a standard VPN-only app, a standalone traditional antivirus app, and a combined VPN and threat protection app — compare across each of those criteria.

* A VPN helps keep browsing destinations private from your ISP, but your ISP can still see that you’re connected to a VPN server.

^ The certifications were awarded to a NordVPN feature formerly known as Threat Protection Pro™.

References

¹Federal Trade Commission. (2024, February 22). FTC Order Will Ban Avast from Selling Browsing Data for Advertising Purposes, Require It to Pay $16.5 Million Over Charges the Firm Sold Browsing Data After Claiming Its Products Would Block Online Tracking. https://www.ftc.gov/news-events/news/press-releases/2024/02/ftc-order-will-ban-avast-selling-browsing-data-advertising-purposes-require-it-pay-165-million-over 

² Tongue, G. (2025). One in four Americans spend over $100 a month on streaming and subscriptions. Bango. https://bango.com/one-in-four-americans-spend-over-100-a-month-on-streaming-and-subscriptions/