SSL Checker

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SSL Checker: Test Your SSL Certificate

With the SSL Checker, you can determine the security of your SSL certificate and your website. We check your SSL certificate for validity, used protocols, and known security vulnerabilities, while also assessing your site's HTTP Security Header.

To start the check, simply enter your domain in the field above and confirm by pressing Enter. In a few seconds, you'll receive the following information.

  • SSL Certificate
    We'll provide you with information on the issuer, host name, signature algorithm used, and key size. We also check whether the certificate or certificate chain is trustworthy and if the certificate remains valid.

  • SSL protocols
    We check for the use of 6 different SSL protocols and provide tips about which you should consider ceasing to employ for security reasons. The protocols are SSLv2, SSLv3, TLS 1, TLS 1.1, TLS 1.2, and TLS 1.3.

  • SSL Vulnerabilities
    In addition, we assess whether your server is affected by any known security vulnerabilities. Specifically, we look for susceptibility to Heartbleed, POODLE, FREAK, and LOGJAM.

  • HTTP Security Header
    Apart from the SSL certificate, our tool will also evaluate your HTTP Security Header. If configured correctly, HTTP headers such as Content Security Policy can increase the security of a page, protecting against cross-site scripting attacks.

Further information:

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Janis von Bleichert studied business informatics at the TU Munich and computer science at the TU Berlin, Germany. He has been self-employed since 2006 and is the founder of He writes about hosting, software and IT security.
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