Top 11 Free Online Tools for Testing Your Website’s Security

by Oxana Barber 4,118 views1

Whether your digital product/service is developed and managed in-house or by a third party developer, ultimately you will be responsible for protecting your customers’ data. This makes regular website security testing a critical part of your startup’s business continuity efforts.

From testing the strength and validity of SSL certificates to surfacing web application vulnerabilities, the following 11 free online tools can offer critical guidance for shoring up your defenses against cyber attackers.


Source: was created by UK-based information security consultant Scott Helme to test for the existing of CSP and HSTS security headers. The web application returns scan results in addition to ratings that quantify its findings.

10. Email Security Grader


Phishing spam, malware, and other dangerous threats more often make their way onto corporate networks via email. To mitigate some of these threats, the Email Security Grader will tell you if your email server is spam-proof and if DNS is set up securely/properly.

9. AsafaWeb


AsafaWeb provides cybersecurity scanning services for ASP.NET websites and web applications. The tool will tell you if your web application harbors vulnerabilities like header information exposure and disabled secure cookies.

8. Tinfoil Security


Tinfoil Security’s web application scans websites for top 10 OWASP vulnerabilities and other security flaws. Scans take roughly 5 minutes and results are presented in an easy-to-understand report.

7. Quttera


Quttera’s online tool provides blacklisting checking capabilities and scans websites and web applications for the presence of malware and vulnerabilities. The tool is also available as a WordPress plugin.

6. Web Inspector


Web Inspector provides blacklisting checking and scans websites/web applications for a myriad of vulnerabilities: phishing threats, malware, worms, backdoors, trojans, suspicious frames/connections, and more.

5. Sucuri Sitecheck


Sucuri is arguably the most popular free website malware and security scanning solution available—the tool is capable of testing for malware, website blacklisting, injected spam/defacements, and more. Major CMS platforms like WordPress, Joomla, Magento, and Drupal are supported, among others.

4. DigiCert SSL Installation Diagnostics Tool


SSL certificate installation can be a pain—and provide a false sense of security if done incorrectly. DigiCert’s SSL validation tool provides installation diagnostics for troubleshooting issues with your installed SSL certificates.

3. Qualys SSL Labs


Like the DigiCert SSL tool, Qualys SSL Labs tool will perform analysis of your installed SSL certificates and their data including expiry day, cipher, SSL/TLS version, handshake simulation, and more.

2. Qualys Free Scan


Also from Qualys, Free Scan scans websites and web applications for top OWASP vulnerabilities and other critical security gaps. Other notable features include SCAP security benchmark testing and interactive scan reports, to name a few.

1. Acunetix Online Vulnerability Scanner


Acunetix scans your website or web application for over 500 vulnerabilities and boasts the highest detection of WordPress vulnerabilities: over 1200 known vulnerabilities in its core, themes and plugins.

Getting started with all of these online tools is a trivial affair: simply enter your website address to find out how susceptible it is to the leading digital threats. Don’t let cyber attackers damage the brand and reputation of your tech startup—these free online tools provide a cost-effective, albeit rudimentary foundation for ongoing cybersecurity efforts.



Comments (1)

  1. Only deep scanning with or can detect malware hidden in website’s files.

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