Why it matters
When someone shares your link in a message, an email or a feed, the app builds a little card from tags in your page: an image, a title and a short description. A good card gets clicked. A blank grey box with a bare URL gets scrolled past.
This tool reads the same tags the apps read and shows you the three common shapes that card takes. If something looks wrong, the Open Graph Checker tells you which tag to fix, and the Meta Tag Generator writes the fix for you.