OG image
In plain English
The preview picture apps show when someone shares a link (Open Graph image).
Example
A Learn article shares with a preview of its hero image. After the image changes, a messenger may still show the old preview until its cache refreshes. A low-contrastHow different two colors look next to each other, needed so text and icons stay readable. OG image makes shared titles hard to read.
Why it matters
Shared links need a face. An OG image is the preview picture apps show, Open Graph image, when someone pastes a URL.
A page names it with an og:image tag. Chat apps and social sites cache link previews, so an updated image can take a while to appear.
Updated October 1, 2026.