The Open Graph protocol was created by Facebook to standardize the use of metadata within a webpage to represent the content of a page. It allows your webpage to become a rich object in a social graph.
This is usually due to one of three reasons: the image URL is not absolute (starts with http/https), the image is too small (needs to be at least 200x200px, preferably 1200x630px), or Facebook has cached an older version of your page without the image.
You can use the Facebook Sharing Debugger or the Twitter Card Validator. Entering your URL into these tools forces the platform to re-scrape your page and clear their cache.
Yes, 100% free with no sign-ups required. We process everything in your browser.