Best Free Malware Removal Tools

Among the best free solutions for malware removal are Microsoft Defender, Malwarebytes Free, ESET Online Scanner, Microsoft Safety Scanner, Malwarebytes AdwCleaner, and Microsoft Defender Offline. Each solution has its own purpose from virus detection to malware cleaning, hijacked browsers and adware removal.

Most Windows users should consider using Microsoft Defender as it is included in Windows OS and provides your system with continuous protection. In case of suspected infection, on-demand scanning can be done via Malwarebytes Free or ESET Online Scanner.

Below you will find six reliable solutions, what they can do for free, and when to use them.

6 Best Free Malware Removal Tools

Tool	Best For	Cost
Microsoft Defender	Everyday malware protection and removal	Free
Malwarebytes Free	Detecting and removing existing malware	Free
ESET Online Scanner	One-time malware scans	Free
Microsoft Safety Scanner	Second-opinion malware detection	Free
Malwarebytes AdwCleaner	Removing adware and browser hijackers	Free
Microsoft Defender Offline	Removing persistent malware	Free

1. Microsoft Defender – Best Free Malware Protection Overall

Best for: Windows users who want built-in malware protection without installing another antivirus program.

Windows Defender, included in Windows Security, is one of the most convenient free malware removal options for Windows computers.

It can detect and remove viruses, spyware, ransomware, and other malicious software. Unlike standalone cleanup utilities, it also provides real-time protection against potential threats.

Key features:

Real-time malware protection.
Quick, full, and custom scans.
Automatic security intelligence updates.
Threat detection and quarantine.
Offline scanning for persistent threats.

Pros:

Already included in Windows.
No additional subscription required.
Provides continuous protection.
Offers multiple scanning options.

Cons:

Windows-focused built-in antivirus functionality.
Advanced security features may require additional Microsoft products or subscriptions.

How to use it:

Open the Windows Start menu.
Search for Windows Security.
Select Virus & threat protection.
Choose Quick scan or Scan options.
Select Full scan for a more comprehensive inspection.
Follow the recommended actions if threats are detected.

Microsoft also provides an offline scanning option that restarts the computer and scans outside the normal Windows environment.

Official website: https://support.microsoft.com/en-us/windows/security/threat-malware-protection/virus-and-threat-protection-in-the-windows-security-app

2. Malwarebytes Free – Best for Removing Existing Malware

Best for: Users who suspect their computers already contain malware, spyware, or potentially unwanted software.

Malwarebytes Free is a popular on-demand malware scanner designed to help identify and remove existing threats.

It can detect different types of malicious software, including viruses, trojans, spyware, and other unwanted programs.

Its main advantage is that it can provide an additional malware scan alongside an existing antivirus solution.

Key features:

Manual malware scanning.
Quick and custom scan options.
Malware detection and removal.
Spyware and trojan detection.
Quarantine for detected threats.

Pros:

Useful as a second-opinion scanner.
Offers free scanning options.
Supports Windows and macOS.
Can complement existing antivirus protection.

Cons:

Free Windows scanning does not provide the same real-time protection as the paid version.
Scheduled scans and several advanced protection features require a subscription.

How to use it:

Visit the official Malwarebytes website.
Download Malwarebytes Free.
Install and open the application.
Start a quick or custom scan.
Review detected threats.
Quarantine or remove malicious items.

Important: Malwarebytes Free should not be treated as a replacement for an antivirus program with real-time protection.

Official website: https://www.malwarebytes.com/

3. ESET Online Scanner – Best for One-Time Malware Scanning

Best for: Users who want another malware scanner without committing to a paid antivirus subscription.

ESET Online Scanner is a free Windows utility that checks computers for viruses, trojans, spyware, and other security threats.

It is particularly useful when you want to perform a one-time malware inspection without installing a complete security suite.

The tool can scan for threats and quarantine or remove detected items.

Key features:

Free one-time malware scanning.
Detection of viruses and spyware.
Threat quarantine and removal.
Full-system scanning.
Can run alongside existing antivirus software.

Pros:

No paid subscription required for the one-time scan.
Useful for second-opinion detection.
Does not require replacing your existing antivirus.
Provides a report of detected threats.

Cons:

Primarily designed for Windows PCs.
Does not replace continuous antivirus protection.
Requires downloading and running the scanning utility.

How to use it:

Visit the official ESET Online Scanner page.
Download the free scanner.
Launch the downloaded application.
Follow the setup instructions.
Start a full-system scan.
Review the results and quarantine or remove detected threats.

Official website: https://www.eset.com/us/home/online-scanner/

4. Microsoft Safety Scanner – Best for a Second Malware Check

Best for: Windows users who want a separate malware detection and removal utility.

Microsoft Safety Scanner is a free, downloadable security tool that detects and attempts to remove malware from Windows computers.

Unlike a traditional antivirus application, it is designed for manual scanning rather than continuous background protection.

It can also attempt to reverse certain changes made by identified threats.

Key features:

Manual malware scanning.
Malware detection and removal.
Quick, full, and custom scan options.
Portable executable.
Detailed scan reports.

Pros:

Free to download and use.
Does not require a traditional installation.
Useful for additional malware checks.
Comes directly from Microsoft.

Cons:

Does not provide real-time protection.
The downloaded version expires after 10 days.
Requires downloading a fresh copy for updated scanning definitions.

How to use it:

Open Microsoft's official Safety Scanner download page.
Download the appropriate version for your Windows system.
Run the downloaded executable.
Select your preferred scan type.
Wait for the scan to finish.
Review the results and follow the recommended cleanup steps.

Official website: https://learn.microsoft.com/en-us/microsoft-365/security/intelligence/safety-scanner-download

5. Malwarebytes AdwCleaner – Best for Removing Adware and Browser Hijackers

Best for: Users experiencing unwanted advertisements, browser redirects, suspicious toolbars, or unwanted applications.

Malwarebytes AdwCleaner is a specialized free cleanup utility that focuses on adware, potentially unwanted programs (PUPs), browser hijackers, and unwanted preinstalled software.

Unlike general-purpose antivirus tools, it focuses on unwanted programs that can interfere with browsing experiences and computer performance.

Key features:

Adware detection and removal.
Browser hijacker cleanup.
Potentially unwanted program detection.
Unwanted software removal.
Quarantine and cleanup options.

Pros:

Free to use.
Specialized in adware cleanup.
Lightweight cleanup utility.
Helpful for unwanted browser changes and pop-ups.

Cons:

Primarily designed for Windows.
Not a complete antivirus replacement.
Does not provide continuous malware protection.

How to use it:

Download AdwCleaner from the official Malwarebytes website.
Open the application.
Select Scan Now.
Review the detected adware and unwanted programs.
Select the items you want to quarantine.
Follow the cleanup instructions and restart if requested.

Official website: https://www.malwarebytes.com/adwcleaner

6. Microsoft Defender Offline – Best for Persistent Malware

Best for: Users dealing with malware that repeatedly returns or interferes with normal antivirus scans.

Microsoft Defender Offline is a scanning feature included in Windows Security.

Its main advantage is that it scans the computer after restarting, without loading the normal Windows environment. This makes it harder for certain persistent threats to hide or interfere with the scanning process.

It is particularly useful when ordinary antivirus scans fail to resolve a suspected infection.

Key features:

Offline malware scanning.
Detection of persistent threats.
Scanning through the Windows Recovery Environment.
Uses updated security intelligence.
Built into Windows Security.

Pros:

Free and integrated into Windows.
Does not require separate antivirus software.
Useful for difficult-to-remove infections.
Scans outside the normal Windows environment.

Cons:

Requires restarting the computer.
Primarily designed for Windows devices.
May not resolve every type of malware infection.

How to use it:

Save your open files and close applications.
Open Windows Security.
Select Virus & threat protection.
Choose Scan options.
Select Microsoft Defender Antivirus (offline scan).
Click Scan now.
Allow your computer to restart and complete the scan.

After the scan, check Protection history in Windows Security to review the results.

Official website: https://support.microsoft.com/en-us/windows/security/threat-malware-protection/virus-and-threat-protection-in-the-windows-security-app

Which Free Malware Removal Tool Should You Choose

The right tool depends on the type of infection and what you want to accomplish.

Your Situation	Recommended Tool
You want everyday antivirus protection	Microsoft Defender
You suspect an existing malware infection	Malwarebytes Free
You want an additional full-system scan	ESET Online Scanner
You need a portable second-opinion scanner	Microsoft Safety Scanner
Your browser displays unwanted pop-ups or redirects	AdwCleaner
Malware keeps returning after removal	Microsoft Defender Offline

Our recommendation: Start with Microsoft Defender for everyday protection. If you suspect an infection, run an additional scan using Malwarebytes Free or ESET Online Scanner. For stubborn threats, consider Microsoft Defender Offline.

You do not need to install all six tools. Using several security programs with overlapping real-time protection can cause conflicts, so choose tools based on your actual needs.

How to Remove Malware from Your Computer for Free

If you suspect your computer has been infected, follow this practical cleanup process.

Step 1: Disconnect from the Internet if Necessary

If you notice suspicious network activity, ransomware behavior, or possible unauthorized remote access, disconnect the affected computer from Wi-Fi or Ethernet.

This can help limit communication with external attackers.

For ordinary adware or minor unwanted programs, disconnecting is not always necessary.

Step 2: Run a Full Antivirus Scan

Open Windows Security and perform a full scan.

A quick scan is useful for an initial check, but a full scan examines more files and programs.

Step 3: Run a Second-Opinion Malware Scan

If you still suspect malware, use Malwarebytes Free or ESET Online Scanner.

A second scanner can identify threats that your primary antivirus may not have detected.

Step 4: Remove or Quarantine Detected Threats

Review the scan results carefully.

Follow the application's recommended removal or quarantine instructions. Avoid manually deleting unfamiliar system files because doing so can damage Windows.

Step 5: Run an Offline Scan if Malware Persists

If the same threat repeatedly appears after removal, use Microsoft Defender Offline.

This scans the computer outside the regular Windows environment and can help detect persistent malware.

Step 6: Update Your Passwords

If you suspect that malware stole your login credentials, change important passwords using a separate, trusted device.

Prioritize:

Email accounts.
Banking and financial accounts.
Social media accounts.
Work-related accounts.
Password manager accounts.

Enable multifactor authentication wherever possible.

Step 7: Update Your Operating System and Applications

Install available security updates for Windows, browsers, and other applications.

Keeping software updated helps address vulnerabilities that malware may exploit.

If malware has caused serious damage, consider restoring the computer from a known-clean backup or reinstalling Windows.

What to Look for in a Free Malware Removal Tool

Not every free malware scanner offers the same functionality. Before choosing one, consider these factors.

1. Malware detection and removal

A useful removal tool should identify threats and provide a clear process for quarantining or removing them.

2. Real-time protection

Some free tools only scan when you manually launch them. Others provide continuous monitoring.

Understand this difference before relying on a free scanner as your primary security solution.

3. Scan options

Look for quick, full, custom, or offline scanning options depending on your requirements.

4. Quarantine functionality

Quarantine allows detected files to be isolated rather than immediately deleted. This can be useful when a detection needs further review.

5. Operating system compatibility

Check whether the tool supports your operating system and version before downloading it.

6. Official download sources

Download security software directly from its developer. Avoid third-party download websites, suspicious advertisements, and unofficial installers.

FAQ

1. What is the best completely free malware removal tool?

Microsoft Defender is a strong starting point for Windows users because it provides built-in antivirus protection and malware removal without an additional subscription.

Malwarebytes Free is another useful option when you want an additional manual malware scan.

2. Can free malware removal tools completely remove viruses?

Free malware removal tools can detect and remove many types of malicious software. However, no scanner can guarantee that every infection will be removed.

Some advanced threats may require offline scanning, system restoration, or a clean operating system installation.

3. Is Malwarebytes Free better than Windows Defender?

They serve different purposes.

Windows Defender provides ongoing real-time antivirus protection, while Malwarebytes Free is useful for additional manual malware scanning and cleanup.

Using them for their respective purposes can provide a practical combination.

4. Can I remove malware without installing antivirus software?

Yes. Windows includes Microsoft Defender and Microsoft Defender Offline, while Microsoft Safety Scanner offers a separate portable scanning utility.

However, having an active antivirus solution is important for ongoing protection.

5. Are online malware removal tools safe?

Legitimate tools downloaded from official security vendors are generally safer than unknown cleanup utilities.

Be careful with websites claiming they can scan and completely clean your computer directly through a browser. Full-system malware removal normally requires a local application or built-in security tool.