SSL Checker — Free Tool

This one is different from the other tools: to check a live server, your hostname is sent to sslguides.com's own server, which connects to it on your behalf — a browser can't open a raw TLS connection to an arbitrary host itself. No certificate data is stored.

Hostname

Port

Connection type

Quick check before this runs

Certificate presented by this server

SSL & CSR Decoder CSR Generator Key Matcher SSL Converter RSA Key Converter Bulk SSL Checker CT Log Search CA Chain Builder OCSP Checker OpenSSL Trace DCV Readiness Checker Certificate Chooser

Setting this up on your own server

This tool needs a small PHP backend, since a browser can't open a raw TLS connection to an arbitrary host on its own. Upload ssl-checker.php (from the site package) to your PHP hosting — any PHP 7.1+ host with the OpenSSL extension works, which is nearly all of them — then point the CHECKER_ENDPOINT constant near the top of this page's script at wherever you placed it. By default it assumes /ssl-checker.php at your site's root.