Malwarebytes vs Windows Defender comes down to this: Windows Defender is free, built into Windows, and its lab scores sit right beside the best paid products, so most careful Windows users do not need to pay anything. Malwarebytes Premium is worth the $59.99 a year only if you want stronger cleanup for adware and unwanted programs, scam blocking in every browser, or one subscription that also covers a Mac or a phone.
That surprises a lot of people. Defender used to be the weak option you replaced on day one. That is no longer true. In AV-TEST’s July-August 2026 Windows 11 test, Defender scored 17.5 out of 18, and Malwarebytes Premium scored a perfect 18 out of 18. In the cycle before that, the result was the other way around. The two products are now so close on protection that the right choice depends on your habits, your devices, and your budget, not on a big gap in lab scores.
This Malwarebytes vs Windows Defender comparison sticks to facts that can be checked: the two most recent AV-TEST cycles, the AV-Comparatives Real-World Protection Test from February to May 2026, the vendors’ own feature lists, and the price on Malwarebytes’ own pricing page. No home-made malware test, no guessed numbers, and no winner picked before the evidence was in.
What is the real difference between Malwarebytes and Windows Defender?
Windows Defender, officially Microsoft Defender Antivirus, is part of Windows Security on Windows 10 and 11. It is already installed, already turned on, and already updating through Windows Update. You pay nothing, you install nothing, and there is nothing to renew. It includes real-time protection, behavior monitoring, cloud-delivered protection, a firewall, SmartScreen checks for sites and downloads, and Controlled Folder Access for ransomware.
Malwarebytes started as the cleanup tool people ran after an infection, and it built its name on removing adware, browser hijackers, and potentially unwanted programs (PUPs) that other products missed. The paid product, now sold as Malwarebytes Premium Security in the Standard, Plus, and Ultimate plans, is a full antivirus with real-time protection. The free version is still only an on-demand scanner: it finds and removes infections already on your PC, but it does not watch your PC in the background.
The simplest way to think about it is this. Defender is a guard that comes with the house. Malwarebytes Premium is a guard you hire, and the reason to hire it is the extra cleanup skill, the browser scam layer, and coverage for devices that are not your Windows PC.
| At a glance | Windows Defender | Malwarebytes Premium (Standard) |
|---|---|---|
| Price | $0, built into Windows 10 and 11 | $59.99 a year for 3 devices |
| Real-time protection | Yes, on from the first start | Yes, on paid plans only |
| Free version | The whole product is free | On-demand scanner only, no real-time protection |
| Devices covered | The Windows PC it ships on | 3 devices: Windows, Mac, Android, and iPhone |
| Browser scam blocking | SmartScreen, built into Edge | Browser Guard, free extension for Chrome, Edge, Firefox, and Safari |
| Ransomware layer | Controlled Folder Access (off by default) | Ransomware protection layer in real-time protection |
| Money-back guarantee | Not applicable, it is free | 60 days on annual plans |
Which one protects better against malware?
On raw protection, the honest answer is that they are nearly tied, and the lead changes from one test cycle to the next. That is the whole story, and any review that declares a permanent winner from a single cycle is overselling it.
In AV-TEST’s July-August 2026 Windows 11 home-user test, Malwarebytes Premium 5.5 and 5.6 scored 6 out of 6 for protection, 6 out of 6 for performance, and 6 out of 6 for usability: a perfect 18 out of 18 and a TOP PRODUCT award. Microsoft Defender Antivirus (Consumer) 4.18 scored 6 for protection, 5.5 for performance, and 6 for usability: 17.5 out of 18, also a TOP PRODUCT award. The half-point gap came from performance, not protection. Both scored full marks for protection.
In the March-April 2026 cycle, the positions were reversed. Malwarebytes Premium 5.5 scored 5.5 for protection, 6 for performance, and 6 for usability, for 17.5 out of 18. Defender earned the maximum 18 points in that cycle. So across the two most recent cycles each product has held the top score once, and neither has ever trailed by more than half a point.
AV-Comparatives’ Real-World Protection Test for February to May 2026 tells the same close story with live web threats. The test used 400 live cases on Windows 11. Microsoft blocked 396 and 4 systems were compromised, a 99.0% protection rate. Malwarebytes blocked 395 and 5 systems were compromised, a 98.8% protection rate. Both landed in the test’s top cluster, which means the lab treats them as equally effective on protection alone.
The one clear gap in that test is false alarms. Microsoft wrongly blocked nothing: 0 false alarms, the cleanest result in the test. Malwarebytes wrongly blocked 39 clean sites or files, against an average of 8 across the products tested. AV-Comparatives downgraded Malwarebytes’ award because of it. A false alarm is not an infection, but it is annoying: a blocked download you actually wanted, or a warning on a site that is safe. If you hate pop-ups and blocked pages, that 39 matters more than the 0.2-point protection gap.
| Lab test | Malwarebytes Premium | Microsoft Defender |
|---|---|---|
| AV-TEST, July-August 2026, Windows 11 (protection / performance / usability) | 6 / 6 / 6 = 18/18, TOP PRODUCT | 6 / 5.5 / 6 = 17.5/18, TOP PRODUCT |
| AV-TEST, March-April 2026, Windows 11 | 5.5 / 6 / 6 = 17.5/18, TOP PRODUCT | 18/18, TOP PRODUCT |
| AV-Comparatives Real-World Protection Test, February-May 2026 (400 live cases) | 98.8% protected (395 blocked, 5 compromised) | 99.0% protected (396 blocked, 4 compromised) |
| AV-Comparatives same test, false alarms | 39 wrongly blocked sites or files | 0 false alarms |
Which one is better at cleaning up adware and unwanted programs?
This is where Malwarebytes earns its reputation, and it is the strongest reason to keep it on your PC even if you never pay for it. Malwarebytes built its name on finding the junk other products walk past: adware that injects ads into your browser, toolbars and search hijackers that change your home page, and potentially unwanted programs that arrive bundled with free software you actually wanted.
The free version of Malwarebytes is a genuinely useful cleanup tool. Download it from malwarebytes.com only, run a scan, and it will find and remove infections already on your PC at no cost. That is exactly what it is for. What it will not do is guard you between scans. It has no real-time protection, no web blocking, and no ransomware shield. If you use the free version, keep Defender turned on as your always-on protection.
Defender does remove adware and unwanted programs too, and its detection scores above show it catches the dangerous stuff. But cleanup is not its specialty, and it is not the tool most technicians reach for when a PC is already full of pop-ups and hijacked search results. If your PC is already infected or already slow with junk, run the free Malwarebytes scan first, remove what it finds, and then decide whether you want the paid version to keep watch. For more on whether Defender alone is enough for a clean PC, see Is Windows Defender Enough to Protect Your PC?
Browser Guard vs SmartScreen: which one stops scam sites better?
Most attacks now start in the browser, not in a downloaded file: a fake tech-support pop-up that locks your screen, a phishing page that looks exactly like your bank, or a search result that leads to a scam shop. Both products have an answer, but they work in different places.
SmartScreen is built into Microsoft Edge and into Windows itself. It checks the sites you visit, the files you download, and the apps you run against Microsoft’s reputation data, and it warns you before you open something reported as phishing or malware. It is solid, it is free, and it is already on. Its weak spot is coverage: the full web protection works best inside Edge. In Chrome or Firefox you do not get the same SmartScreen layer.
Browser Guard is Malwarebytes’ free extension for Chrome, Edge, Firefox, and Safari. It blocks ads, trackers, malicious sites, and scam pages, and Malwarebytes describes it as the world’s first browser extension that can detect and stop tech support scams. It also targets browser lockers and hijackers, the scare tactics that freeze your browser and demand a phone call. The core extension is free, and you do not need a paid Malwarebytes plan to use it.
Two limits matter. First, Browser Guard only sees what happens inside your browser. It cannot scan a file on your PC or clean an infection that is already there. Second, neither tool is perfect, and neither one replaces careful habits: a warning only helps if you stop instead of clicking through it. If you browse mainly in Chrome or Firefox and you worry about scam pop-ups, Browser Guard is the more useful of the two. If you live in Edge, SmartScreen already covers you and Browser Guard is a bonus, not a need.
Which one protects better against ransomware?
Both products have a ransomware layer, but they work differently, and one of them needs you to switch it on.
Defender’s ransomware protection is Controlled Folder Access. It blocks untrusted apps from changing files in your protected folders, which by default include Documents, Pictures, Videos, Music, and Desktop. The catch is that it is off by default. You have to open Windows Security, go to Virus and threat protection, select Manage ransomware protection, and turn on Controlled folder access. Once it is on, a trusted app you use can still get blocked, and you will need to allow it through by hand. That is a small hassle, and it is worth it: it is the closest thing to a lock on your personal files.
Malwarebytes Premium includes a ransomware protection layer inside its real-time protection, alongside web protection, malware and PUP protection, and exploit protection. It watches for the behavior of ransomware, such as mass file encryption, rather than only guarding a list of folders. It is on once you pay and install, with nothing extra to switch on.
Neither layer is a backup. If ransomware encrypts your files and you have no backup, no antivirus can promise to get them back. Keep a backup of your photos and documents on an external drive or a cloud service that keeps older versions, and keep it disconnected or separate from your PC when you are not backing up. If a scam has already taken your money, report it at ReportFraud.ftc.gov and ic3.gov.
Which one slows down your PC less?
In the lab, Malwarebytes has the small edge in the latest cycle, and the two were tied in the cycle before it. In AV-TEST’s July-August 2026 Windows 11 test, Malwarebytes Premium scored 6 out of 6 for performance and Defender scored 5.5 out of 6. In the March-April 2026 test, both scored 6 out of 6. AV-TEST’s performance score comes from everyday tasks: opening websites, launching apps, installing software, and copying files, measured on a standard PC and a high-end PC.
In real life, on a modern PC with 8 GB of memory or more, you are unlikely to feel a difference from either one. Defender’s one known weak spot in the lab is installing apps, where it slows things down more than most rivals. Malwarebytes is a light app by reputation, and its lab score backs that up. If your PC is old or short on memory, Malwarebytes Premium is the slightly lighter choice on paper, but the bigger speed win on an old PC is removing the junk already on it, not switching antivirus products.
One warning applies to both: do not run two real-time antivirus products at once to be extra safe. Microsoft advises against it, because two engines scanning the same files can slow your PC and cause update errors. Pick one real-time engine and stick with it.
How much does Malwarebytes cost, and is it worth $59.99 a year?
Malwarebytes Standard lists at $59.99 a year for 3 devices on malwarebytes.com, checked November 9, 2026. That covers Windows, Mac, Android, and iPhone, so one subscription can protect your PC, your laptop, and your phone. The Plus plan, which adds the Malwarebytes VPN, lists at $79.99 a year for 3 devices. Every annual plan comes with a 60-day money-back guarantee. Prices change with first-year discounts, and Malwarebytes states that discounts apply to the first year only, so check the price on the checkout page before you buy. Windows Defender costs nothing, because it is built into Windows.
Is $59.99 a year worth it? Work it out per device: about $20 a year per device if you use all three slots. That is fair value if you actually use the three slots or the browser and cleanup extras. It is poor value if you have one Windows PC, you browse in Edge, and your PC is already clean, because Defender already gives you the same level of protection for free.
| What you pay | Windows Defender | Malwarebytes Standard |
|---|---|---|
| Yearly price | $0 | $59.99 a year |
| Devices at that price | 1 Windows PC | 3 devices, including Mac, Android, and iPhone |
| Cost per device per year | $0 | About $20 if you use all 3 slots |
| Renewal surprise | None, there is no subscription | First-year discounts do not carry over, so check the renewal price |
| Refund window | Not applicable | 60-day money-back guarantee |
Can you run Malwarebytes and Windows Defender together?
This is the most misunderstood part of the whole comparison, so here it is plainly. You cannot run two real-time antivirus engines together, and you should not try. When you install Malwarebytes Premium, it registers itself as your antivirus, and Defender steps back automatically. That is by design. If you later uninstall Malwarebytes, Defender switches itself back on, so your PC is never left without real-time protection. Microsoft advises against running two real-time products at once.
Malwarebytes Free is the exception, and it is the setup many experts actually use. Free has no real-time protection, so it does not fight Defender. You keep Defender as your always-on guard, and you run the free Malwarebytes scan whenever you want a second opinion, or whenever your PC starts acting strangely. That combination costs nothing and gives you Defender’s quiet accuracy plus Malwarebytes’ cleanup skill.
There is one trap to avoid. If you start a Malwarebytes trial and let it expire without uninstalling it, the expired product can stay registered as your antivirus while its real-time protection has stopped working, and Defender stays off. If you decide not to pay, uninstall Malwarebytes properly through Settings, then Apps, then restart, and check that Defender is back on in Windows Security.
| Setup | How it works | Who it suits |
|---|---|---|
| Defender only | Free, built in, nothing to install or renew | Most Windows users with one PC |
| Defender plus Malwarebytes Free | Defender guards in real time; free Malwarebytes scans on demand | Anyone who wants a second opinion at no cost |
| Malwarebytes Premium only | Premium takes over as the real-time engine; Defender steps back | Multi-device households and heavy cleanup needs |
| Two paid real-time products | Do not do this; the engines fight and slow the PC | Nobody |
Malwarebytes vs Windows Defender: which one should you choose?
There is no single winner, because the two products solve different problems. Pick by your situation, not by a brand name.
| Your situation | Pick this | Why |
|---|---|---|
| One Windows PC, tight budget, careful browsing | Windows Defender | Free, already installed, lab scores match paid products, 0 false alarms in the latest real-world test |
| PC already full of pop-ups, hijacked search, or adware | Malwarebytes Free scan first | Best cleanup for adware and unwanted programs, costs nothing, runs beside Defender |
| Windows PC plus a Mac, Android, or iPhone to protect | Malwarebytes Standard, $59.99 a year | One subscription covers 3 devices; Defender alone does not cover your phone or Mac |
| You browse in Chrome or Firefox and worry about scam pop-ups | Defender plus free Browser Guard | Browser Guard adds tech-support scam blocking in every browser at no cost |
| An older parent or relative who needs simple, set-and-forget protection | Windows Defender | Nothing to install, nothing to renew, nothing to expire and leave them unprotected; see our guide to the best antivirus for seniors |
| You want one paid product and you hate false alarms | Windows Defender | 0 false alarms against Malwarebytes’ 39 in the February-May 2026 real-world test |
Our recommendation for most readers is the free combination: keep Defender turned on, turn on Controlled Folder Access, and keep the free Malwarebytes scanner installed for a second opinion. Pay the $59.99 a year only if you have more than one device to cover, or your PC keeps collecting adware, or you want Browser Guard’s scam blocking with a paid real-time engine behind it. Either way, the most important step is not the product you pick. It is keeping one real-time engine on, keeping Windows updated, and keeping a backup of the files you cannot afford to lose.
How to switch safely in 5 minutes
| Step | What to do |
|---|---|
| 1 | Decide which product will be your one real-time engine: Defender or Malwarebytes Premium. |
| 2 | If you are moving to Malwarebytes Premium, download it from malwarebytes.com only, install it, and confirm it shows as your active antivirus in Windows Security. |
| 3 | If you are moving back to Defender, uninstall Malwarebytes through Settings, then Apps, restart your PC, and confirm Defender is on in Windows Security. |
| 4 | Turn on Controlled Folder Access in Windows Security under Virus and threat protection, then Manage ransomware protection. |
| 5 | Run one full scan with your chosen product, then add the free Malwarebytes scanner as a second opinion if Defender is your main engine. |
Frequently asked questions
Is Malwarebytes better than Windows Defender?
Not clearly. In AV-TEST’s July-August 2026 Windows 11 test, Malwarebytes Premium scored 18 out of 18 and Defender scored 17.5 out of 18, but in the March-April 2026 test the result was the other way around: Defender scored 18 and Malwarebytes scored 17.5. In AV-Comparatives’ February-May 2026 real-world test, Defender blocked 99.0% of 400 live cases and Malwarebytes blocked 98.8%. The real differences are price, cleanup, and extra devices, not a big protection gap.
Is Windows Defender enough by itself?
For most careful Windows users, yes. It is free, built into Windows 10 and 11, and its lab scores sit with the best paid products. Turn on Controlled Folder Access in Windows Security for ransomware protection, keep Windows updated, and add the free Malwarebytes scanner as a second opinion if you want an extra check.
Do I need Malwarebytes if I have Windows Defender?
No, you do not need it for basic protection. Malwarebytes is worth paying for if you want one subscription that covers a Mac or phone as well as your PC, if you want its Browser Guard scam blocking in every browser, or if you want a stronger cleanup tool for adware and unwanted programs.
Can I run Malwarebytes and Windows Defender at the same time?
Not as two real-time antivirus engines. When you install Malwarebytes Premium, Defender steps back because Microsoft advises against running two real-time products at once. Malwarebytes Free is different: it has no real-time protection, so it runs beside Defender without conflict as an on-demand scanner.
Is Malwarebytes Free enough, or do I need the paid version?
Free is enough as a cleanup tool. It scans and removes infections already on your PC at no cost. It does not watch your PC in the background, block malicious sites, or stop ransomware as it happens. For that always-on protection you need a paid plan or you need to keep Defender turned on.
Does Malwarebytes slow down your PC more than Defender?
In the latest AV-TEST cycle we checked, no. In the July-August 2026 Windows 11 test, Malwarebytes Premium scored 6 out of 6 for performance and Defender scored 5.5 out of 6. In the March-April 2026 test both scored 6 out of 6. On most modern PCs you are unlikely to feel a difference from either one.
How much does Malwarebytes cost per year?
Malwarebytes Standard lists at $59.99 a year for 3 devices on malwarebytes.com, checked November 9, 2026. The Plus plan, which adds a VPN, lists at $79.99 a year for 3 devices. Prices change with first-year discounts, so check the price on the checkout page before you buy. Windows Defender costs nothing because it is built into Windows.
