Use the following links to CHECK your SSl, Decode CSR or SSL certificate. You can also convert your SSL.
SSL Server Test
This free online service performs a deep analysis of the configuration
of any SSL web server on the public Internet. Please note that the
information you submit here is used only to provide you the service. We
don’t use the domain names or the test results, and we never will.
https://www.ssllabs.com/ssltest/
CSR Decoder
https://www.sslshopper.com/csr-decoder.html
SSL Checker
https://www.sslshopper.com/ssl-checker.html
Certificate Decoder
https://www.sslshopper.com/certificate-decoder.html
Certificate key matcher
https://www.sslshopper.com/certificate-key-matcher.html
SSL Converter