10 Free tools to check your site for malware and threats

A website can appear to function normally while hidden threats operate quietly in the background. Malicious code, injected scripts, or unauthorized redirects may remain undetected for weeks, putting visitors, sensitive data, and search engine rankings at risk. 

For website owners, developers, and businesses, failing to check your site for malware regularly can lead to serious consequences such as blacklisting, traffic loss, or even complete site compromise.

Fortunately, detecting these threats does not always require complex security tools or advanced technical knowledge. Today, several reliable online scanners allow you to quickly check your site for malware and identify suspicious files, vulnerabilities, or malicious activity within minutes.

In this guide, we will explore 10 free tools to check your site for malware and threats, helping you detect potential infections early and take the necessary steps to keep your website safe.

Why you should regularly check your site for malwareLink to heading

Regularly checking your website for malware is an essential part of maintaining website security. Cyber threats can infiltrate a site through outdated plugins, weak passwords, vulnerable scripts, or compromised hosting environments. In many cases, website owners do not realize their site has been infected until visitors report suspicious behavior or search engines issue security warnings. 

By frequently scanning your website, you can detect threats early and reduce the risk of long-term damage. Malware infections can seriously harm both your visitors and your online reputation. Malicious code may redirect users to harmful websites, display unwanted advertisements, or attempt to steal sensitive information such as login credentials or payment data. 

If a search engine detects malicious activity on your site, it may display warning messages or temporarily remove your pages from search results, which can lead to a significant drop in traffic and user trust.

Another important reason to check your site regularly is that malware often spreads silently. Hackers frequently hide malicious scripts deep within website files, making them difficult to detect through manual inspection alone. Regular malware scans help identify unusual files, suspicious code injections, and unauthorized modifications before attackers can exploit them further.

Routine malware checks also help website owners maintain overall system integrity. When you regularly check your site for malware, you can identify vulnerabilities early, update outdated components, remove suspicious files, and strengthen your security measures. This proactive approach helps prevent future attacks and ensures your website remains safe for visitors and business operations.

>>> Learn more: 15 Common signs that your WordPress website is under attack

Best tools to scan a website for malwareLink to heading

System443Link to heading

System443 is a free online malware scanning website that allows users to quickly check the security status of a website simply by entering its URL. The tool does not require any software installation and works entirely through a web browser, making it convenient for webmasters, system administrators, or general users who want to quickly verify whether their own website, or another site, may contain malicious code.

Advantages:

• The online malware scanner is completely free to use and does not require users to create an account before performing a scan.
• Users only need to enter a website URL to check your site for malware, after which the tool automatically analyzes the site and provides warnings if any signs of malicious code are detected.
• Because the tool operates fully online, there is no need to download or install additional software, making it easy to use for both non-technical users and technical professionals.

Disadvantages:

• The tool focuses only on malware detection and does not provide features for cleaning, isolating, or removing malicious code from an infected website.
• Its scanning capability relies mainly on analyzing the website URL and external behavior, meaning it cannot directly access files inside the server or the website database.
• Unlike more advanced security platforms, the tool does not offer scan history storage or real-time alert notifications.

WordfenceLink to heading

Wordfence is a security plugin designed for WordPress websites that provides multiple tools to protect sites from malware, viruses, and other online threats. One of its core features is a built-in malware scanner that automatically checks your website for suspicious files, vulnerabilities, and potential infections. 

Wordfence operates as a server-side malware scanner, which means the scanning process runs on your hosting server and uses its resources. It can analyze the entire website, including installed plugins and themes, to check your site for malware and identify possible threats.

Advantages:

• Wordfence scans your website every day and automatically notifies you by email if it detects any security issues.
• In addition to its malware scanning capability, Wordfence provides several built-in security features, such as a Web Application Firewall (WAF) and two-factor authentication.

Disadvantages:

• The free version updates its malware definitions 30 days after new threats are discovered, so detecting the latest malware requires a paid plan.
• Wordfence performs scans using your server’s resources, which may affect website performance.
• The plugin is designed exclusively for WordPress websites.

SucuriLink to heading

Sucuri is widely recognized in the field of website security and provides a free malware scanning tool in addition to a range of paid services designed to protect websites. These premium services include features such as a web application firewall, protection against distributed denial-of-service attacks, and professional malware cleanup support.

The free Sucuri SiteCheck scanner works as an external malware detection tool that allows website owners to check your site for malware from the public side of a website. To run a scan, you simply enter your website’s URL into the SiteCheck tool, and it analyzes the front-end pages for signs of malicious code or suspicious activity.

Advantages:

• Sucuri’s SiteCheck scanner is completely free to use and does not require users to create an account before running a scan.
• The scanner is platform-agnostic, which means it can analyze websites built on different technologies or content management systems without requiring a specific setup.

Disadvantages:

• The free malware scanner does not include scheduled or automatic scanning features. Users need to manually visit the SiteCheck page and submit their website URL each time they want to check their site for malware.
• Because the scan is performed remotely, the SiteCheck tool can only review the publicly accessible source code of your website. As a result, it may not detect malware that is hidden deeper within server files or backend systems.
• For WordPress websites, Sucuri notes that the free WordPress malware scanning plugin may not detect every possible infection and therefore cannot guarantee completely accurate results.

QutteraLink to heading

Quttera is a well-known provider in the field of website security, offering several solutions designed to help website owners check your site for malware. Among these tools is a free online malware scanner that allows users to quickly analyze their website for potential threats and suspicious activity.

The web-based scanner from Quttera is limited to analyzing the front end of a website. However, if your website runs on WordPress, Quttera also provides a free plugin that can perform a deeper scan of the entire site. This plugin checks not only the visible pages but also internal areas such as admin pages, plugins, and other core files.

Advantages:

• The free report generated by Quttera is more comprehensive than the reports offered by many other free security tools.
• Server-side scanning, available through the WordPress plugin and paid plans, runs on Quttera’s cloud servers, so the scanning process does not affect your website’s performance.
• Quttera’s detection algorithm is capable of identifying previously unknown malware.

Disadvantages:

• The free web-based scanner can only analyze the front end of your website.
• Automated scanning features are only included in premium plans.

MalCareLink to heading

MalCare is a security service created to scan for malware and remove infections on websites built with WordPress. This plugin provides automatic malware detection along with additional protection tools, such as a web application firewall that helps block unauthorized access and prevents attackers from exploiting vulnerabilities on your website. 

The malware scanner in MalCare automatically checks the entire website, including core administrative files, installed plugins, and active themes. To perform these scans efficiently, the plugin securely creates a temporary copy of your site’s files and analyzes them on MalCare’s own servers. This approach allows website owners to check your site for malware thoroughly without interrupting normal website operations.

Because the scanning process takes place externally, it does not place additional load on your website and therefore avoids slowing down performance during the scan.

Advantages:

• MalCare provides automatic daily malware scans that can examine the entire website for suspicious activity or malicious files.
• The scanning process is handled on MalCare’s remote servers, which helps ensure that the malware detection process does not affect your website’s speed or performance.
• If the system detects any indication of a malware infection, MalCare will immediately send an email notification so you can quickly investigate the issue and take steps to protect your website.

Disadvantages:

• The free version of the plugin can only notify you that malware exists on your website but does not reveal the exact location of the infection. To identify the infected files and remove the malware, you must upgrade to one of the paid plans.
• MalCare is designed specifically for websites built on WordPress. If your website runs on a different content management system or platform, you will need to consider other malware scanning solutions available on the list.

DetectifyLink to heading

Detectify is a cybersecurity platform that provides multiple solutions for scanning websites and web applications for malware, viruses, and other security threats. It is often used by organizations that need advanced security monitoring or want to regularly check your site for malware across complex web infrastructures. 

The service is developed with complex DevOps infrastructures in mind, making it suitable for organizations that manage large or technically advanced web environments. 

Detectify allows users to perform security scans whenever needed or schedule automated scans at regular intervals. These scans analyze the entire website environment, including both visible pages and backend components that may not be easily accessible to visitors.

Advantages:

• Detectify provides strong protection for complex websites and web applications by scanning for many different types of vulnerabilities, including malware and viruses.

Disadvantages:

• Detectify is designed as an enterprise-level security solution, which means it includes many advanced features that typical website owners may not require.
• Because of its extensive capabilities and advanced functionality, Detectify is considerably more expensive than most other tools available in this list.

SiteLockLink to heading

SiteLock provides multiple services designed to detect and remove malware from websites, and one of its available tools is a free online malware scanner. This scanner allows users to quickly check your site for malware without installing additional software. With SiteLock’s free scanner, users can analyze the publicly accessible pages of a website to identify potential malware threats. 

The scanner operates directly through a web interface and typically delivers results in less than 60 seconds. In addition to searching for malicious code, the tool also checks the website against databases of known viruses and common security vulnerabilities that could expose the site to further attacks.

Advantages:

• SiteLock’s free online malware scanner works faster than many similar tools and presents the results in a clear, user-friendly report that is easy to understand.
• SiteLock’s paid plans include automated malware removal features, allowing detected threats to be cleaned from the website automatically once they are discovered.

Disadvantages:

• Automatic and scheduled scanning features are only included in the premium subscription plans.
• Although SiteLock supports platforms such as WordPress and other content management systems, its dedicated plugin is not as widely adopted compared to other security plugins.

Jetpack ProtectLink to heading

Designed specifically for WordPress websites, Jetpack Protect is a reliable tool for scanning your site for malware and staying ahead of potential security risks. For WordPress administrators who want to easily check your site for malware, this plugin provides a simple and automated solution. This free plugin can be activated with a single click and immediately begins monitoring your website. 

It performs daily scans to identify vulnerabilities that attackers could use to insert malicious code. By detecting these weaknesses early, Jetpack Protect helps website owners address security issues before they escalate into serious problems.

Advantages:

• Because the malware scanning process runs on Jetpack’s own servers, the plugin can examine your entire website without affecting your site’s speed or performance.
• Jetpack Protect relies on the same malware database used by the advanced enterprise-level security tool WPScan. This database is regularly updated by experienced cybersecurity professionals to ensure new threats are quickly identified.
• The plugin is very easy to set up. With just one click, you can start protecting your website, and it will automatically run daily scans while notifying you of any detected problems directly in your dashboard.

Disadvantages:

• Jetpack Protect is designed exclusively for WordPress websites. If your website runs on a different platform, you will need to consider another malware scanning tool instead.
• Although the plugin can identify vulnerabilities and provide guidance on how to fix them, automatic malware removal is not included in the free version and requires a paid upgrade.

IsItWP Security ScannerLink to heading

IsItWP offers several helpful tools designed for website owners, including a malware scanning tool that can examine a website for malicious code and potential security weaknesses. With this scanner, users can quickly check your site for malware by simply entering the website’s URL.

The scanning technology used by IsItWP is powered by Sucuri, which allows the tool to analyze the publicly accessible pages of a website and detect suspicious scripts, malware signatures, or other visible threats. Besides scanning for malware or viruses, the IsItWP security scanner also verifies whether a website has been flagged by Google Safe Browsing or listed in other well-known malware blocklists. 

Advantages:

• It allows you to check any website for malware quickly by entering the site’s URL.

Disadvantages:

• There is no automatic scanning feature, so users must manually return to the IsItWP website each time they want to check their site for malware.
• The scanner can only detect malware that appears on the public front-end pages of a website.
• If the scanner finds malware or suspicious files, IsItWP does not provide instructions or built-in tools to help remove the infection or repair the compromised website.
• The online scanning process is slower compared with many other website malware scanners available online.

Google’s Transparency ReportLink to heading

Google’s Transparency Report is a public platform that shares data about the company’s services and online safety efforts. One part of this report focuses specifically on the Safe Browsing system. Through this section, website owners can enter the URL of their website to check your site for malware and review its Safe Browsing status.

Safe Browsing is a security technology developed by Google to identify websites that may contain malware or phishing content. The system analyzes websites and monitors online threats to determine whether a page could harm visitors. If suspicious or malicious activity is detected, Google may flag the website and display warnings to users before they attempt to access the page.

Advantages:

• The Safe Browsing status check allows website owners to determine whether Google has detected possible malware activity on their website.
• The service is completely free and available to anyone who wants to verify the security status of a website.

Disadvantages:

• The Safe Browsing status check does not run automatically, so website owners must manually check their site’s status on a regular basis.
• The Safe Browsing section of the Google Transparency Report cannot replace a full malware scanning system because it is reactive.
• Google’s Safe Browsing system does not continuously scan every website on the internet, and the company does not publicly disclose how often these scans occur.
• If malware is detected on a website, the Safe Browsing status check does not provide instructions or tools to help website owners remove the malicious code.

How to check your site for malwareLink to heading

Most website malware scanning tools operate in a very similar way, so the process of using them is usually simple and straightforward. In most cases, you only need to follow a few basic steps to start checking your website for potential security threats or malicious code.

Access the scanning website

Open your web browser and go to the official website of the malware scanning tool you have selected. Most tools provide an online interface where you can quickly run a security check without installing additional software.

Enter the website URL

Locate the input field on the homepage of the scanning tool. Then paste or type the complete URL of the website you want to analyze. Make sure the address is accurate so the system can correctly access and scan your website.

Start the scanning process

Click the button labeled “Scan”, “Check”, “Submit” or a similar command to begin the analysis. Once you start the scan, the tool will initiate the process of examining your website for possible threats.

Wait for the results

The scanning process may take anywhere from a few seconds to several minutes depending on the tool being used as well as the size and complexity of the website. During this time, the scanner typically sends requests to your website, analyzes the page source code, reviews publicly accessible files, and compares the findings with its malware signature database to detect suspicious or harmful elements.

How to remove malware and prevent reinfectionLink to heading

When malware is discovered on a website, acting quickly is critical to limit damage and prevent attackers from maintaining access. Removing malicious code is only the first step. Website owners must also address the vulnerabilities that allowed the infection to occur in the first place. 

A complete recovery process should include cleaning infected files, restoring trusted backups, strengthening authentication, and implementing security tools that block future attacks. Even after the cleanup process, it is important to regularly check your site for malware to ensure that no hidden threats remain active.

Clean your core files and restore clean backupsLink to heading

Start by identifying and removing infected files from your website. Malware often hides inside core system files, modified scripts, or newly created files placed in unusual directories. Carefully compare your current files with the original versions provided by your CMS or framework to detect unauthorized changes.

If the infection is widespread, restoring the website from a known clean backup may be the safest option. Choose a backup created before the infection occurred, then verify that it does not contain malicious code before restoring it. After the restoration process, scan the website again to confirm that the malware has been fully removed.

Update all plugins, themes, and CMS softwareLink to heading

Outdated software is one of the most common entry points for malware infections. Vulnerabilities in plugins, themes, or the CMS itself can allow attackers to inject malicious code or gain unauthorized access.

Once your website is clean, update all components immediately. Install the latest versions of your CMS, plugins, and themes, and remove any extensions that are no longer maintained or necessary. Regular updates help close security gaps and reduce the likelihood of future attacks. At the same time, it is good practice to periodically check your site for malware after updates to ensure that no malicious files were left behind.

Enforce strong password policies and two-factor authenticationLink to heading

Weak login credentials make it easier for attackers to compromise websites. After removing malware, all passwords associated with the website should be changed immediately. This includes administrator accounts, FTP credentials, database access, and hosting control panels.

Implement strong password policies that require complex and unique passwords. In addition, enable two-factor authentication (2FA) whenever possible. With 2FA in place, users must provide a second verification step, which significantly reduces the risk of unauthorized logins.

Implement a dedicated Web Application Firewall (WAF)Link to heading

A Web Application Firewall (WAF) provides an additional layer of protection by filtering and blocking malicious traffic before it reaches your website. This type of security system helps defend against common attacks such as SQL injection, cross-site scripting, brute force login attempts, and automated bot attacks.

By deploying a dedicated WAF, website owners can monitor incoming requests, block suspicious behavior, and protect vulnerable application layers. Combined with regular malware scans and system updates, a WAF helps maintain long-term website security and prevents reinfection. Integrating this protection layer also supports ongoing efforts to check your site for malware and stop threats before they cause serious damage.

For WordPress websites, adding a specialized firewall can significantly strengthen your security posture. W7SFW (WordPress Firewall) is designed as an external protection layer that works independently outside your website environment. Because it does not operate as a traditional plugin inside the WordPress system, it avoids common issues such as plugin conflicts, performance slowdowns, or compatibility problems after updates. 

Instead, it filters and blocks malicious requests before they ever reach your website, helping protect login pages, core files, and sensitive endpoints from attacks.

>>> Enable W7SFW today to add an additional firewall layer that helps keep your website safe from automated attacks, suspicious traffic, and emerging threats.

ConclusionLink to heading

Regularly taking the time to check your site for malware is one of the most effective ways to maintain a secure and trustworthy website. By using reliable scanning tools, you can detect suspicious activity early and respond before the problem escalates.

The free tools introduced in this guide provide a practical starting point for website owners who want to check their site for malware without complex setup or expensive security platforms. Combined with regular updates, strong authentication practices, and a dedicated firewall, these tools can help you build a stronger defense against evolving cyber threats.