What is an og:image?

By Mark Boreland ·

In short

  • An og:image is the preview picture a chat app or social platform shows when your link is pasted in.
  • It comes from an Open Graph tag in the page, a small piece of metadata browsers and apps read.
  • A good preview makes a shared link far more likely to be clicked.

An og:image is part of the Open Graph protocol, a set of metadata tags that tell other apps how to present your link. When you paste a URL into Slack, iMessage, WhatsApp, or LinkedIn, the app fetches the page, reads its Open Graph tags, and builds the little card you see with a title, a description, and an image. The og:image is that picture. Without it, your link unfurls as a bare, forgettable line of text.

This is quietly decisive for sharing, because the preview is the first thing the recipient sees before deciding whether to click. NudgeHost generates a sensible preview for hosted files so a link looks intentional rather than broken. When you host a PDF the preview reflects the document, and a designed page you share for something like the flow to share a presentation with a client carries a clean card into the client's inbox. A strong preview is the difference between a link that gets opened and one that gets ignored.

If you control the page, you set the og:image with a single meta tag pointing at an image roughly 1200 by 630 pixels. For files hosted on NudgeHost the preview is handled for you. Hosting is free to start, and drop a file to get started is where you drop the file in. The practical point is that the preview is part of the message, not an afterthought.

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