Compare Malwarebytes vs Windows Defender
Malwarebytes vs Windows Defender at a Glance
This is the most-misunderstood matchup in consumer security, so let us clear it up immediately: Malwarebytes and Windows Defender are not competitors and should not be compared head-to-head as primary antiviruses. Microsoft Defender is a full real-time antivirus engine built into Windows 11 and Windows 10, and it scored a perfect 18 / 18 at AV-TEST February 2026. Malwarebytes Premium is an anti-malware layer designed to run alongside another real-time engine and catch what slipped through — adware, PUPs, browser hijackers, post-infection persistence, and zero-day exploits that signature engines missed. AVLab named it Product of the Year 2026.
Headline verdict: run both. Defender as your real-time antivirus (on by default, free, 18/18) plus Malwarebytes Premium as a second layer. This is the single most-recommended setup on r/antivirus, r/techsupport, and r/Windows11, and it is what we recommend to friends and family who do not want to pay for a full premium suite like Bitdefender or Norton. It costs $44.99/year for Malwarebytes Premium (5 devices) or $0 for Malwarebytes Free (on-demand only).
Quick Verdict Table
| Microsoft Defender | Malwarebytes Premium | |
|---|---|---|
| Role | Primary real-time antivirus | Second-layer anti-malware |
| First-year price | Free (built-in) | $44.99 / 5 devices |
| AV-TEST Feb 2026 | 18 / 18 | Not submitted (not a full AV) |
| Independent award | AV-TEST Top Product | AVLab Product of the Year 2026 |
| Signature detection | Comprehensive | Targeted (PUPs, adware, exploits) |
| Ransomware rollback | Controlled Folder Access (manual) | 7-day automatic rollback |
| Intended use | Always-on baseline | Layered with another real-time engine |
| Our recommendation | Keep running | Add on top |
The layered stack is the value here. Defender covers commodity malware, phishing, and the bulk of drive-by threats. Malwarebytes catches what Defender misses — and there is always a small slice of post-compromise persistence, browser hijackers, and adware bundlers that every signature engine misses. Together, the combination is comparable to a paid premium suite on raw protection, at roughly a third of the price.
Lab Test Showdown
Microsoft Defender — AV-TEST February 2026: 18 / 18 (Protection 6/6, Performance 6/6, Usability 6/6). Top Product. Defender has maintained 18/18 for 14 consecutive cycles since mid-2022. At AV-Comparatives 2025 it scored Advanced in Real-World Protection (below Advanced+ tier), slightly behind Norton, Bitdefender, and Kaspersky but comfortably above failing products.
Malwarebytes Premium — why it is not in AV-TEST scores: Malwarebytes does not submit to most AV-TEST or AV-Comparatives flagship protection tests because its product is not designed to compete on the same methodology — it focuses on post-compromise cleanup and targeted threat categories (PUPs, adware, browser hijackers, exploit kits) that generic real-time AV tests do not measure well. The independent lab that tests Malwarebytes' actual use case, AVLab, named Malwarebytes Premium its Product of the Year 2026, with standout scores on Advanced In-the-Wild Malware Protection and Fileless Attack Detection.
What this means: judging Defender and Malwarebytes against each other on AV-TEST scores alone would miss the point. Defender wins the signature-detection test because it is a signature-detection product. Malwarebytes wins AVLab's "stuff that got past your primary AV" tests because that is its design. The right question is not "which scores higher" but "do I need both" — and for most Windows users in 2026, the answer is yes.
Pricing + Renewal Reality
Microsoft Defender: free forever. Ships with Windows 11 and Windows 10, activates automatically, updates via Windows Update, never asks for a credit card, no paid tier. There is literally no cost conversation to have.
Malwarebytes pricing:
- Malwarebytes Free: $0. On-demand scanner only, no real-time protection. Manually click Scan once a week, remove what it finds. Useful as a budget-zero second layer.
- Malwarebytes Premium: $44.99 first year for 5 devices (often $34.99-$39.99 on sale), renews at a similar rate. Adds real-time web protection, ransomware shield, exploit mitigation, and Brute Force Protection.
- Malwarebytes Premium + Privacy VPN: $59.99 first year. Adds unlimited VPN.
Malwarebytes has the most honest renewal pricing in consumer security — the renewal is close to the intro price, not the Norton / McAfee 2x jump. You do not need to manage renewal actively; the product is fairly priced year one and year two.
Total cost of the Defender + Malwarebytes stack: $44.99/year for Malwarebytes Premium (5 devices). $0 for Malwarebytes Free. Compare to Bitdefender Total Security at $19.99 first year / $89.99 renewal, Norton 360 Deluxe at $49.99 first year / $119.99 renewal. Over three years the stack is more expensive than Bitdefender but cheaper than Norton, and it matches or beats both on the specific protection categories Malwarebytes specializes in (PUPs, adware, exploit kits, post-compromise cleanup).
Feature-by-Feature Comparison
Pricing | ||
| Price | $39.99 | $0 |
| Old pricing | ||
| Money back Guarantee | ||
Scanning | ||
| Real-time Antivirus | ||
| Manual Virus Scanning | ||
| USB Virus Scan | ||
| Registry Startup Scan | ||
| Auto Virus Scanning | ||
| Scheduled scan | ||
Threat type | ||
| Anti-Spyware | ||
| Anti-Worm | ||
| Anti-Trojan | ||
| Anti-Rootkit | ||
| Anti-Phishing | ||
| Anti-Spam | ||
| Email Protection | ||
| Chat/IM Protection | ||
| Adware Prevention | ||
Compatibility | ||
| Windows | ||
| Mac | ||
| Android | ||
| IOS | ||
Usage | ||
| Easy of use | ||
Extra features | ||
| Personal Firewall | ||
| Parental Controls | ||
| Gamer Mode | ||
| VPN Service | ||
| Smartphone Optimizer | ||
| Device Tune-up | ||
| Safe browser | ||
Support | ||
| Live Help | ||
| Phone support | ||
| Email support | ||
| Ticket support | ||
| Feature | Microsoft Defender | Malwarebytes Premium |
|---|---|---|
| Real-time antivirus (signature) | Yes | Yes (targeted) |
| PUP / adware detection | Limited | Best-in-class |
| Browser hijacker removal | Limited | Yes |
| Exploit mitigation | Exploit Guard (Enterprise) | Anti-Exploit (consumer) |
| Ransomware protection | Controlled Folder Access | Ransomware Protection + 7-day rollback |
| Web & phishing filter | SmartScreen (Edge/Chrome) | Web Protection (all browsers) |
| Firewall | Windows Firewall | Brute Force Protection (RDP-specific) |
| Password manager | Edge-only | No |
| VPN | No | Add-on (+$15/yr with Premium) |
| Cloud backup | No | No |
| Devices covered | Per-device (bundled) | 5 (Premium) |
| Designed to layer? | Yes (auto-disables vs 3rd party) | Yes (by design) |
Notice the overlap is small. Defender handles signature detection, phishing, and the Windows Firewall. Malwarebytes handles PUPs, adware, exploit mitigation, and ransomware rollback. They cover different attack vectors. The only product in this comparison designed from the ground up to run alongside another real-time antivirus is Malwarebytes — Windows will not disable Defender when you install it, because Malwarebytes does not register as a primary antivirus.
Real-World Performance
We ran the layered stack (Defender + Malwarebytes Premium) on the same mid-range Windows 11 laptop (Intel i5-12450H, 16 GB DDR5, NVMe SSD) for a week. Numbers below are for the combined stack, with Defender-only numbers in parentheses for comparison.
| Metric | Defender only | Defender + Malwarebytes |
|---|---|---|
| Idle RAM | 60-120 MB | 120-180 MB |
| Full scan CPU peak | 25-40% | 30-45% (when scans stagger) |
| Boot delta vs clean | +0 seconds | +2-3 seconds |
| Background processes | 1 (MsMpEng) | 3 (MsMpEng + Mbam + MBAMService) |
| User-visible friction | None | Occasional tray notification on detected PUP |
The layered stack adds roughly 60-100 MB of idle RAM and two extra background processes — a small cost on any machine from 2018 onward. Scans are smart about not running simultaneously. The only visible friction is occasional Malwarebytes tray notifications when it catches a PUP or adware bundler, which is exactly what you want it to do.
Who Should Run Defender Alone
- Zero-budget users who will not install anything. Defender is already running. If you do nothing, you are protected to 18/18 against commodity threats.
- Users with locked-down Microsoft business accounts. If your IT department manages your machine via Intune or Microsoft 365, they may block third-party installs. Defender alone is fine.
- Users who browse only trusted sites, never install freeware, and never click email links. The threat surface is small enough that Defender alone is sufficient.
- Users on very old hardware with tight RAM (<4 GB). Adding Malwarebytes' 60-100 MB footprint may matter on 2010s-era laptops with 2-4 GB RAM. Defender alone is lighter.
- Users who have already paid for a full premium suite (Bitdefender, Norton, Kaspersky). Those suites replace Defender. Do not add Malwarebytes unless the suite specifically supports it (some do, some do not).
Read our full Microsoft Defender review for the complete breakdown.
Who Should Add Malwarebytes
- Anyone who downloads freeware, installs tools from third-party sites, or regularly tests new software. PUP and adware bundlers are Malwarebytes' specialty. Defender catches some; Malwarebytes catches more.
- Parents of households with multiple users. Kids and older relatives click more risky links. Malwarebytes' web protection and PUP shield catches what Defender's SmartScreen misses.
- Anyone who has ever been infected before. Post-compromise cleanup is exactly what Malwarebytes was built for. If you have had to clean up a browser hijacker or adware infection, the 7-day ransomware rollback and exploit mitigation are worth the $44.99.
- Users who refuse to pay for a full premium suite but want paid-tier protection. Defender + Malwarebytes is the single closest configuration to Bitdefender Total Security or Norton 360 without buying a full suite.
- Small-business users on Windows 11 Home. Microsoft Defender for Endpoint is an Enterprise product; Windows 11 Home users get consumer Defender, which is solid but lacks exploit-mitigation depth. Malwarebytes Anti-Exploit fills that gap.
- Anyone who has read r/techsupport recovery threads. Malwarebytes Free shows up in roughly 90% of "help me clean my PC" threads. It is the community-standard second opinion.
Read our full Malwarebytes Premium review for test notes.
Frequently Asked Questions
Can I run Malwarebytes and Windows Defender together?
Yes — this is the whole point of Malwarebytes. It is designed to run alongside another real-time antivirus engine, including Microsoft Defender. Windows will not disable Defender when you install Malwarebytes, because Malwarebytes does not register itself as a primary antivirus. This is the only two-product combination we recommend in consumer security; do not try this with Norton + Bitdefender or similar full-suite pairs.
Do I need Malwarebytes if I have Windows Defender?
Not required, but recommended for most users. Defender alone is 18/18 at AV-TEST and genuinely solid against commodity malware. What Defender does not catch as well: PUPs (potentially unwanted programs), adware, browser hijackers, exploit kits, and some zero-day fileless attacks. Malwarebytes specializes in exactly those categories. If you download freeware, install tools regularly, or share a machine with users who click unpredictable things, add Malwarebytes. If you are a very careful browser who installs only from known-good sources, Defender alone is enough.
Is Malwarebytes Free enough or do I need Premium?
Malwarebytes Free is on-demand only — you run a scan manually, it finds things, you remove them. It is a legitimate free second layer but requires discipline. Malwarebytes Premium adds real-time protection (blocks threats as they appear), web protection (blocks malicious URLs before you load them), ransomware shield, and exploit mitigation. For users who will actually run weekly scans, Free is enough. For users who want set-and-forget real-time coverage, Premium is $44.99/year and worth it.
Will Malwarebytes slow down my PC?
Barely. In our tests, adding Malwarebytes Premium to Defender raised idle RAM from 60-120 MB to 120-180 MB, added 2-3 seconds to boot time, and introduced two additional background processes. On any machine from 2018 onward this is invisible during normal use. On older laptops with under 4 GB RAM, the impact is measurable but still small.
Is the Defender + Malwarebytes stack as good as Bitdefender or Norton?
Close but not identical. You gain: specialist-grade PUP and adware protection, the best exploit mitigation in consumer security, 7-day ransomware rollback. You lose: unlimited VPN (Norton/Bitdefender bundle one), password manager (Norton/Bitdefender include), identity-theft restoration (Norton LifeLock only), and integrated cloud backup (Norton 50 GB). For raw malware protection the stack is comparable. For the full feature bundle a premium suite wins.
Which should I install first, Defender or Malwarebytes?
Defender is already running on every Windows 11 and Windows 10 machine — you do not install it. Just install Malwarebytes on top; it will coexist with Defender automatically. If you previously installed a third-party antivirus that disabled Defender, uninstall the third-party product first (use the vendor's removal tool, not just Programs and Features) and let Defender re-enable itself, then install Malwarebytes.
Final Verdict: the One-Line Answer
Run both. Microsoft Defender as your real-time antivirus (on by default, free, 18/18 at AV-TEST February 2026) plus Malwarebytes Premium as your second layer ($44.99/year, AVLab Product of the Year 2026) is the community-standard setup for Windows home users in 2026. It matches paid premium suites on malware protection for less than half the equivalent-feature cost, with the caveat that you give up bundled VPN, password manager, and identity-theft restoration. If you want those extras, step up to Bitdefender Total Security ($19.99 first year) or Norton 360 Deluxe ($39.99 first year) instead.
Read the full Malwarebytes review | Read the full Defender review | Our full 2026 ranking
