How to Generate Dynamic Preview Images for Social Media Sharing

How to Generate Dynamic Preview Images for Social Media Sharing

How to Generate Dynamic Preview Images for Social Media Sharing. Pretty preview of your page when shared on Facebook, Twitter, Slack etc. A Netlify function and the image CDN ImageEngine for storing and image optimimisation.

If you’ve been sharing a link on any social media, embedding it on a webpage or even sending it by iMessage, you’ve probably seen the preview “card”. Either a version without an image like this:

Even more handy - and beautiful - a preview of the page, consisting of an image, heading and a short intro:

This is achieved by using some specific “meta tags” that will magically enhance the link with a richer presentation. The actual meta tags to make use of Open Graph and Twitter cards is well described in the link above. For images specifically, ensure that these are included on your webpage:

<meta property="og:image" content="https://foo.com/thumbnail.jpg">
<meta name="twitter:image" content=" https://foo.com/thumbnail.jpg">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:image:alt" content="Alt text for image">

Most Content Management Systems (CMS) offer some level of social preview images, but what if your article doesn’t have a featured image suitable for social media usage? Further, the impact might be better with some relevant text on the image.

In the following we’ll see how to make use of the JAMstack hosting service Netlify and ImageEngine as the image CDN for caching.

social-media netlify serverless jamstack

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