How to check website security fast using free online tools

Have you ever wondered whether your website is truly safe, or just “looks” secure? Many website owners don’t realize there’s a problem until traffic drops, customers complain, or Google shows a warning message. That’s why knowing how to check website security is something every website owner should know, even if you’re not a tech expert.

The good news is that you don’t need complicated software or advanced skills to do it. Today, there are many free online tools that can quickly scan your site for malware, check your SSL certificate, and detect basic security risks. In this guide, you’ll learn how to check website security fast using simple, step-by-step methods that anyone can follow.

Why checking website security is criticalLink to heading

Every website, from small blogs to enterprise eCommerce platforms, is a potential target for automated bots, vulnerability scanners, and organized cybercriminals. Attacks are not limited to large corporations. In fact, small and medium-sized websites are often targeted because they typically lack advanced protection.

Checking website security regularly allows you to:

• Detect vulnerabilities before attackers exploit them
• Prevent data breaches and malware infections
• Protect customer information and payment data
• Maintain SEO rankings and domain reputation
• Ensure compliance with data protection regulations

Ignoring routine security checks increases the probability of financial loss, legal consequences, and long-term brand damage.

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

How to check website securityLink to heading

Check for HTTPS and SSL certificateLink to heading

Start by verifying whether your website uses HTTPS. A secure website should display a padlock icon in the browser address bar and use an SSL certificate to encrypt data transmitted between the server and users.

Click on the padlock icon to view certificate details such as issuer, validity period, and encryption level. You can also run a deeper SSL test using tools like Qualys SSL Labs to evaluate configuration strength and identify vulnerabilities.

If your site still runs on HTTP or has an expired certificate, user data such as login credentials and payment information may be exposed.

Scan the website for malwareLink to heading

Another essential part of how to check website security is scanning for malware. Malicious code can be injected into your website without obvious visual signs. Running an external malware scan helps detect hidden scripts, spam content, phishing pages, and potential blacklist issues.

You can use platforms such as Sucuri, System443 or VirusTotal to scan your domain. These tools analyze your website against known malware signatures and security databases. If malware is detected, immediate cleanup and security reinforcement are required to prevent further damage and search engine penalties.

Check website reputationLink to heading

Search engines and cybersecurity services maintain blacklists of compromised or dangerous websites. If your site appears on one of these lists, visitors may see warning messages before accessing your content.

Use tools like Google Safe Browsing to check whether your domain has been flagged. A blacklist status can significantly impact traffic and credibility, so it is essential to resolve any issues quickly.

Test for common vulnerabilitiesLink to heading

Understanding how to check website security also involves testing for common technical vulnerabilities. Websites are frequently targeted through attack vectors such as:

• SQL Injection
• Cross-Site Scripting (XSS)
• Remote Code Execution
• Brute Force login attempts

Security standards published by OWASP highlight the most critical web vulnerabilities. You can use vulnerability scanners or conduct penetration testing to identify weaknesses in your system.

Addressing these vulnerabilities early prevents attackers from gaining unauthorized access to your database or server.

Verify firewall protectionLink to heading

A crucial step in how to check website security is verifying whether a Web Application Firewall (WAF) is active. A WAF acts as a protective barrier between your website and incoming traffic, filtering malicious requests before they reach your server.

Check whether your hosting provider includes firewall protection or whether you are using a cloud-based security service such as Cloudflare. Ensure the firewall is active, properly configured, and regularly updated.

Without firewall protection, your website is directly exposed to automated attacks and bot traffic.

Check for software & plugin updatesLink to heading

Outdated software is one of the most common causes of website breaches. If you are using a CMS like WordPress, ensure that:

• Core files are updated
• Themes are up to date
• Plugins are regularly maintained
• Unused plugins are removed

Developers release updates to patch security vulnerabilities. Ignoring updates leaves known weaknesses exploitable by attackers.

Monitor for suspicious login activityLink to heading

Another important component of how to check website security is monitoring login behavior. Unauthorized login attempts may indicate brute force attacks or compromised credentials.

Review your admin logs for:

• Multiple failed login attempts
• Logins from unfamiliar IP addresses
• Access attempts at unusual times
• Newly created admin accounts

Implementing strong passwords, two-factor authentication, and login attempt limits significantly reduces risk.

Run a full website security auditLink to heading

A comprehensive security audit evaluates your website’s infrastructure, codebase, server configuration, and access controls.

This process may include:

• Server configuration review
• File integrity monitoring
• Database security analysis
• Backup verification
• Access permission checks

While automated tools are helpful, professional audits provide deeper insight and long-term security recommendations. Regular audits, quarterly or biannually ensure continuous protection.

Best free tools to check website securityLink to heading

Malware & blacklistLink to heading

System443

System443 is a comprehensive digital infrastructure provider that offers advanced malware scanning services for websites. To help administrators and website owners quickly detect hidden malicious code, especially high-risk threats, System443 has developed a free online malware scanning tool available to all websites.

This tool allows users to scan an entire website quickly by simply entering the site’s URL. Once the scan is completed, the system provides immediate and easy-to-understand warnings, enabling users to identify potential security issues without technical complexity. As an online scanning solution, it supports multiple CMS platforms, making it accessible and practical for a wide range of website owners.

Sucuri SiteCheck

Sucuri is widely recognized as one of the leading companies in website security, especially known for its malware removal services and Web Application Firewall (WAF). Sucuri SiteCheck is their free online website malware scanning tool that allows users to quickly determine whether a website has been infected with malicious code, blacklisted, or exposed to common security issues. 

The tool scans for malware, spam injections, and typical vulnerabilities, while also checking the website’s blacklist status across major search engines and security databases. In addition, it reviews the versions of popular content management systems such as WordPress, Joomla, and Drupal to identify any known vulnerabilities associated with outdated software. 

The scan generates a clear and easy-to-understand report within minutes.

VirusTotal

VirusTotal is a premier, Google-owned security platform that provides a comprehensive "second opinion" on any website's safety. Unlike single-engine scanners, it aggregates real-time intelligence from over 70 leading antivirus engines and URL scan services to detect malware, phishing attempts, and malicious redirects. 

By simply entering a URL, webmasters can instantly see if their domain has been flagged by security vendors and threat intelligence databases, making it an essential first line of defense for monitoring your site's reputation and integrity.

Google Safe Browsing

Google Safe Browsing is a widely used security service developed by Google to identify unsafe websites and protect users from malware, phishing, and deceptive content. The system continuously scans and analyzes large portions of the web to detect harmful or compromised sites.

For website owners, maintaining a “Clean” status on Google Safe Browsing is critical. If a site is flagged, browsers such as Google Chrome display a prominent red warning screen to visitors. This can significantly reduce traffic, harm user trust, and negatively affect search visibility. Checking your status in Google Safe Browsing helps ensure that your website is not perceived as a security risk.

Quttera

Quttera is a specialized web malware scanner that uses both signature-based detection and heuristic analysis to identify malicious code. Its heuristic engine helps detect hidden threats such as obfuscated JavaScript, suspicious redirects, and injected iframes. The public online scanner mainly performs external (black-box) scans. Deeper inspection of internal files and server-side scripts requires installation or integration with the website’s CMS.

Quttera can identify many common backdoors and malware patterns, though no automated tool guarantees detection of all complex or custom threats. It also checks whether a website has been blacklisted by major search engines and security databases, helping site owners assess reputation risks.

Vulnerability scanningLink to heading

ImmuniWeb Website Security Test

ImmuniWeb Community Edition is a free online security testing platform that provides a comprehensive assessment of a website’s external security posture. Unlike basic malware scanners that focus only on detecting malicious code, ImmuniWeb performs broader checks, including HTTP security headers, CMS versions and known vulnerabilities, and SSL/TLS configuration analysis. 

It also evaluates certain compliance-related aspects aligned with standards such as GDPR and PCI DSS, depending on the specific test being performed.

While ImmuniWeb’s enterprise solutions incorporate advanced AI-driven capabilities, the Community Edition primarily offers automated online tests designed to deliver structured and actionable insights rather than full-scale penetration testing. It helps identify outdated software components, weak configurations, and publicly exposed risks that automated bots commonly exploit.

OWASP ZAP (Zed Attack Proxy)

OWASP ZAP (Zed Attack Proxy) is one of the most widely used open-source web application security scanners in the world. It is developed and maintained by a global community of contributors under the OWASP foundation. 

Unlike basic malware scanning tools that only check for known malicious signatures, ZAP functions as an intercepting “man-in-the-middle” proxy, positioning itself between the user’s browser and the target web application. This allows it to monitor, modify, and analyze HTTP/HTTPS traffic in real time.

Through active scanning capabilities, ZAP simulates real-world cyberattacks such as SQL Injection, Cross-Site Scripting (XSS), authentication bypass attempts, and other common web vulnerabilities. It is widely used by developers and security professionals to perform Dynamic Application Security Testing (DAST), assessing how a live web application behaves under attack conditions.

Astra Security

Astra Security is a comprehensive, cloud-based cybersecurity platform that unifies automated vulnerability scanning, managed penetration testing, and continuous security monitoring under a single interface. 

The scanner performs thousands of tests covering common web application vulnerabilities such as SQL injection, XSS, and OWASP Top 10 threats, and integrates with developer workflows to help teams uncover security issues early in the development cycle. 

What sets Astra apart is its combination of automated scanning with expert-driven analysis and reporting, offering actionable findings and remediation guidance that help developers fix vulnerabilities before they can be exploited. It is designed for businesses that want an integrated security partner capable of continuous assessment, collaboration across DevSecOps workflows, and more streamlined vulnerability management.

Nikto

Nikto is a powerful, open-source command-line web server scanner designed to perform security assessments on web servers. Rather than functioning as a network-layer infrastructure scanner, it focuses on identifying web server misconfigurations, outdated software versions, exposed files, and known vulnerabilities. 

Its database includes thousands of checks, often cited at over 6,700 covering potentially dangerous files, CGI scripts, configuration weaknesses, and common security issues.

Nikto is widely used by developers and security professionals to quickly detect “low-hanging fruit” vulnerabilities, such as information disclosure in server headers, missing security flags in cookies, and improperly configured or exposed directories. While it does not perform deep application logic analysis, it is highly effective for identifying easily exploitable weaknesses that attackers commonly target for initial access.

SSL testing toolsLink to heading

Qualys SSL Labs

Qualys SSL Labs is one of the most trusted and widely used tools for analyzing a website’s SSL/TLS configuration. By entering a domain, it performs detailed tests to evaluate certificate validity, encryption strength, protocol support (including TLS 1.3), and overall server configuration.

The tool assigns a clear letter grade from A+ to F based on factors such as key exchange strength, cipher security, and vulnerability exposure. It also detects well-known SSL/TLS vulnerabilities like Heartbleed and POODLE.

A high SSL Labs score indicates strong encryption practices and enhances user trust. While search engines do not use SSL Labs grades directly as a ranking factor, proper HTTPS configuration supports website security and contributes positively to SEO performance.

How often should you check website security?Link to heading

Basic websitesLink to heading

For small websites with low traffic:

• Perform a full security scan at least once per month
• Check for updates weekly
• Monitor uptime and SSL status continuously (automated if possible)

Even small sites are targeted by automated bots, so regular checks remain important.

Business websites & Lead generation sitesLink to heading

For company websites handling customer data:

• Run vulnerability scans biweekly
• Monitor login activity weekly
• Perform a full security audit every 3 - 6 months
• Scan for malware after every major update

These websites face higher reputational and data risks.

eCommerce websitesLink to heading

For online stores handling payments:

• Enable real-time monitoring
• Scan for malware weekly
• Review admin access logs weekly
• Perform a professional security audit quarterly
• Check SSL/TLS configuration every 1 - 3 months

Because financial data is involved, security checks should be proactive and continuous.

ConclusionLink to heading

Website security is not a one-time task, it is an ongoing process. By regularly applying the methods outlined in this guide, you can detect risks early, prevent costly attacks, and maintain a trustworthy online presence. If you are serious about long-term growth, mastering how to check website security is the first step toward building a safer, more resilient website.

In addition to using free online scanning tools to assess potential risks, a WordPress website also requires a proactive layer of protection to prevent attacks from the outset. W7SFW (WordPress Firewall) is a dedicated firewall solution designed specifically for WordPress, functioning as a protective barrier between your website and external traffic. 

The system filters malicious bots, blocks brute force attempts, and prevents the exploitation of common vulnerabilities such as SQL Injection and Cross-Site Scripting (XSS) before they can impact your source code.

By combining regular security checks with the deployment of a firewall like W7SFW, you can not only detect threats promptly but also significantly reduce the likelihood of successful attacks, ensuring that your WordPress website remains secure and stable.

>>> Start protecting your WordPress website today with W7SFW.