HTTPS conversion tool
From MoodleDocs
The HTTPS conversion tool will convert any embedded HTTP content on your site to HTTPS in order for it to display correctly on your HTTPS site.
Note: You are currently viewing documentation for Moodle 3.6. Up-to-date documentation for the latest stable version of Moodle is likely available here: HTTPS conversion tool.
The HTTPS conversion tool will convert any embedded HTTP content on your site to HTTPS in order for it to display correctly on your HTTPS site.