Open Graph Preview

Open Graph is a meta-tag protocol Facebook introduced in 2010 to control how URLs appear when shared. Required tags: og:title, og:type, og:image, og:url. Twitter implemented a parallel set (twitter:card, twitter:title, twitter:image) that fall back to OG tags when absent.

The tool generates the recommended tag block from your inputs and renders a preview matching how Facebook, Twitter/X, LinkedIn, and Slack will display the link.

Open Graph was introduced in 2010 to give pages structured metadata for social sharing. The protocol uses HTML meta tags in the document head with the property attribute (rather than name) prefixed by `og:`. Twitter Cards followed in 2012 with parallel `twitter:` prefixed tags supporting the larger image variants Twitter wanted to display. The most important tags are og:title, og:description, og:image, og:url, og:type, twitter:card, and twitter:image. LinkedIn, Slack, Discord, iMessage, and most other platforms with link unfurling read OG tags. Each platform caches the result; refreshing the cache requires platform-specific debugger tools (Facebook Sharing Debugger, Twitter Card Validator, LinkedIn Post Inspector).

A worked example: a blog post about gradient design. Recommended tags: `<meta property="og:title" content="How to Design Better CSS Gradients">`, `<meta property="og:description" content="Practical patterns for gradient color stops, interpolation, and performance.">`, `<meta property="og:image" content="https://example.com/og/gradient-design.png">` (1200×630, under 1 MB), `<meta property="og:url" content="https://example.com/blog/gradient-design">`, `<meta property="og:type" content="article">`, `<meta name="twitter:card" content="summary_large_image">`. The previewer shows how this renders on each platform — Facebook with image above title, Twitter with the large card layout, Slack as a compact preview, LinkedIn similar to Facebook.

Limitations: OG tags work for static pages where metadata is known at render time. Dynamic content (user dashboards, search results) needs server-side rendering of correct tags per URL — single-page applications often miss this. Image URLs must be absolute and publicly accessible — relative URLs and authenticated images won't load in crawler context. Each platform has its own caching: Facebook 24+ hours, LinkedIn up to 7 days with no public refresh tool. Adding a query string to the URL forces re-fetch on platforms that key the cache by full URL. The preview tool approximates platform rendering; actual layout updates frequently and may differ.